E030 · Source-scoped pinout variants

M.2 card edge interface engineering reference

Dell version-12 module examples, ATP compatibility guidance and the exact ASUS host manual are bounded evidence. No independently inspected M.2 mechanical standard or contact assignment is supplied; the linked M.2-versus-NVMe guide addresses protocol separately.

Open field note Source trail

Source checked · no independent review claimed · Fabrication approved: no

M.2 keys, module format and host-interface reference original orientation schematic — Original pinout diagram; read the exact variant and view below. Not to scale.

Contact count

Not asserted

Keyed module card-edge interface family

Mating boundary

Shape is not the verdict.

The exact module and host socket must agree mechanically and electrically; a matching key is not a protocol or boot verdict.

Orientation

How to read this profile

Original recognition artwork only. No mating-face pin numbering, rear-view transformation, measured key placement or fabrication geometry is supplied.

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Positions / cavity span	67 (TE C-2199230 representative M-key socket)S594Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Contact rows	2 (1-2199230-5)S872Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 1-2199230-5: M-key M.2 board connector. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Connector envelope is distinct from existing22x42/80mm card dimensions; no NVMe/SATA capability guarantee.
Contact pitch	0.5 mm manufacturer-reported centerline or mating-interface pitch (1-2199230-5)S872Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 1-2199230-5: M-key M.2 board connector. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Connector envelope is distinct from existing22x42/80mm card dimensions; no NVMe/SATA capability guarantee.
Dimensions / axis	22 mm Module format width (2242 module format); 42 mm Module format length (2242 module format); 22 mm Module format width (2280 module format); 80 mm Module format length (2280 module format); 21.9 mm connector length (1-2199230-5); 8.7 mm connector width (1-2199230-5); 4.2 mm connector height (1-2199230-5)S426 · S872Separate exact examples; retain each value’s source, role, axis and part scope. Article 000144170 version 12, Figure 1 examples (b)–(d); no tolerance, connector geometry or clearance inferred. Exact named example 1-2199230-5: M-key M.2 board connector. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Connector envelope is distinct from existing22x42/80mm card dimensions; no NVMe/SATA capability guarantee.
Connector role	card-edgeS033 · S426 · S427 · S427 · S427 · S429 · S429Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Keyed module card-edge interface family
Mounting	right-angle surface-mount board connector (1-2199230-5)S872Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 1-2199230-5: M-key M.2 board connector. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Connector envelope is distinct from existing22x42/80mm card dimensions; no NVMe/SATA capability guarantee.
Keying / polarization	A-key (TE C-2199230 B4 part table); B-key (TE C-2199230 B4 part table); E-key (TE C-2199230 B4 part table); M-key (TE C-2199230 B4 part table)S594Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Manufacturer	TE Connectivity (1-2199230-5)S594Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Series	M.2 (1-2199230-5)S594Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Exact part / implementation	1-2199230-5 (1-2199230-5)S594Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.

Not recorded: Nominal contacts, Populated contacts, Contact gender / arrangement, Coupling / latch, Shell / form, Recorded markings, View convention. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits

No independently reviewed M.2 mechanical standard, contact count or assignment is published here.
Nominal module labels are not mating dimensions, tolerances, component-clearance measurements or a cutout drawing.
The exact host’s wired interface, CPU, firmware, module clearance and shared resources still require checking.
A passive-looking adapter or a matching key does not establish SATA conversion, lane availability or boot support.
EKF S82-P6 NVMe PCIe x4 M-Key socket: EKF pp.17-18 numbered M-Key table, socket on S82-P6; odd/even spatial orientation is not independently established.
Transcend MTS400 B+M-key SATA SSD: MTS400 p.6 contact-number table and p.5 mechanical card form. Mechanical B/M gaps are not contacts; odd/even spatial orientation is not independently established.
Kontron KWS 3000-ADL M-key NVMe socket (PCIe x4): Table 24 socket diagram and numbered contacts; key M positions 59-66 have no pins. The manual does not establish a card-back mirror.
Apacer SV250-M242 B+M SATA module: Figure 3-1 TOP VIEW: contacts at bottom, mounting hole at top, M notch left, B notch right, pin 1 at far right. Do not transfer this top view to the back of the card.

Report a correction to these facts →

Pins & wiring

Pinout

Choose the exact wiring. Pin numbers follow its stated view; a schematic does not establish physical positions. Check your exact device before wiring.

Dark pinout view

What the status labels mean

Confirmed: Recorded research passes agree within this variant; this is not independent human review or hardware validation.
Single source: Only one underlying document, or one pass, supports this assignment.
Device-specific: Supported for the named equipment or wiring only. Check your device’s manual.
Unverified: Missing or conflicting evidence. Do not wire from this row.
Not connected: The source explicitly says NC, no contact or no pin for this wiring.

Wiring variantEKF S82-P6 NVMe PCIe x4 M-Key socket

EKF S82-P6 NVMe PCIe x4 M-Key socket

View and evidence limits

EKF pp.17-18 numbered M-Key table, socket on S82-P6; odd/even spatial orientation is not independently established.

P030 M.2 — **Partial**, with separate M-key and B+M variants — A: EKF M-key host and Transcend MTS400 B+M SATA module. B: Kontron M-key host and Apacer SV250-M242 B+M SATA module. Both represent 67 M-key contacts and 59 B+M contacts, omitting the mechanical gaps. Lane/pair positions and polarities align, but TX/RX wording uses source perspectives and optional sidebands differ: EKF implements SMBus/alert, wake/detect and suspend-clock assignments absent or reserved on Kontron. B+M configuration, supply, ground, activity and SATA pair positions align; manufacturing/reserved functions are product-specific. Apacer's introductory key-count sentence contradicts its explicit removed-position rows; B preserves the discrepancy and three uncertain functions. Different manufacturers/documents; no universal B-key or B+M PCIe map is asserted.
67 physical contacts. Positions 59-66 are the M-key gap and excluded from pin rows.
Other B-key WWAN/USB/PCIe, A/E-key, B+M PCIe x2 modules, newer revisions and device-specific option wiring are not established.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

EKF S82-P6 NVMe PCIe x4 M-Key socket — source-scoped contact map
Pin	Signal	What it does	Status
1	GND	Ground reference and return.	Single source Sources
2	+3.3V	Power connection (+3.3V). Check the specified supply.	Single source Sources
3	GND	Ground reference and return.	Single source Sources
4	+3.3V	Power connection (+3.3V). Check the specified supply.	Single source Sources
5	PETN3	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
6	NC	Not connected or absent in this named wiring.	Not connected Sources
7	PETP3	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
8	NC	Not connected or absent in this named wiring.	Not connected Sources
9	GND	Ground reference and return.	Single source Sources
10	LED1#	Control, detection or configuration connection; check the source and device.	Single source Sources
11	PERN3	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
12	+3.3V	Power connection (+3.3V). Check the specified supply.	Single source Sources
13	PERP3	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
14	+3.3V	Power connection (+3.3V). Check the specified supply.	Single source Sources
15	GND	Ground reference and return.	Single source Sources
16	+3.3V	Power connection (+3.3V). Check the specified supply.	Single source Sources
17	PETN2	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
18	+3.3V	Power connection (+3.3V). Check the specified supply.	Single source Sources
19	PETP2	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
20	NC	Not connected or absent in this named wiring.	Not connected Sources
21	GND	Ground reference and return.	Single source Sources
22	NC	Not connected or absent in this named wiring.	Not connected Sources
23	PERN2	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
24	NC	Not connected or absent in this named wiring.	Not connected Sources
25	PERP2	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
26	NC	Not connected or absent in this named wiring.	Not connected Sources
27	GND	Ground reference and return.	Single source Sources
28	NC	Not connected or absent in this named wiring.	Not connected Sources
29	PETN1	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
30	NC	Not connected or absent in this named wiring.	Not connected Sources
31	PETP1	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
32	NC	Not connected or absent in this named wiring.	Not connected Sources
33	GND	Ground reference and return.	Single source Sources
34	NC	Not connected or absent in this named wiring.	Not connected Sources
35	PERN1	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
36	NC	Not connected or absent in this named wiring.	Not connected Sources
37	PERP1	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
38	NC	Not connected or absent in this named wiring.	Not connected Sources
39	GND	Ground reference and return.	Single source Sources
40	SMB_CLK	Clock or clock-control connection, as named by this source.	Single source Sources
41	PETN0	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
42	SMB_DATA	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
43	PETP0	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
44	ALERT	Control, detection or configuration connection; check the source and device.	Single source Sources
45	GND	Ground reference and return.	Single source Sources
46	NC	Not connected or absent in this named wiring.	Not connected Sources
47	PERN0	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
48	NC	Not connected or absent in this named wiring.	Not connected Sources
49	PERP0	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
50	PERST#	Reset control; check active level and the named device.	Single source Sources
51	GND	Ground reference and return.	Single source Sources
52	CLKREQ#	Clock or clock-control connection, as named by this source.	Single source Sources
53	REFCLKN	Clock or clock-control connection, as named by this source.	Single source Sources
54	PEWAKE#	Control, detection or configuration connection; check the source and device.	Single source Sources
55	REFCLKP	Clock or clock-control connection, as named by this source.	Single source Sources
56	RSV	Reserved; no general-purpose wiring is established.	Single source Sources
57	GND	Ground reference and return.	Single source Sources
58	RSV	Reserved; no general-purpose wiring is established.	Single source Sources
67	NC	Not connected or absent in this named wiring.	Not connected Sources
68	SUSCLK	Clock or clock-control connection, as named by this source.	Single source Sources
69	PEDET	Control, detection or configuration connection; check the source and device.	Single source Sources
70	+3.3V	Power connection (+3.3V). Check the specified supply.	Single source Sources
71	GND	Ground reference and return.	Single source Sources
72	+3.3V	Power connection (+3.3V). Check the specified supply.	Single source Sources
73	GND	Ground reference and return.	Single source Sources
74	+3.3V	Power connection (+3.3V). Check the specified supply.	Single source Sources
75	GND	Ground reference and return.	Single source Sources

Sources (1)

S711 · EKF Elektronik GmbH · Technical Information S82-P6: M.2 NVMe SSD Storage / Backplane Gigabit Ethernet NICs
Document 8827, Ed. 3, 12 September 2022 · pp.17-18, NVMe PCIe x4 M.2 M-Key (pins 1-38 and 39-75), EKF Part #255.50.2.2223.10

Transcend MTS400 B+M-key SATA SSD

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

MTS400 p.6 contact-number table and p.5 mechanical card form. Mechanical B/M gaps are not contacts; odd/even spatial orientation is not independently established.

P030 M.2 — **Partial**, with separate M-key and B+M variants — A: EKF M-key host and Transcend MTS400 B+M SATA module. B: Kontron M-key host and Apacer SV250-M242 B+M SATA module. Both represent 67 M-key contacts and 59 B+M contacts, omitting the mechanical gaps. Lane/pair positions and polarities align, but TX/RX wording uses source perspectives and optional sidebands differ: EKF implements SMBus/alert, wake/detect and suspend-clock assignments absent or reserved on Kontron. B+M configuration, supply, ground, activity and SATA pair positions align; manufacturing/reserved functions are product-specific. Apacer's introductory key-count sentence contradicts its explicit removed-position rows; B preserves the discrepancy and three uncertain functions. Different manufacturers/documents; no universal B-key or B+M PCIe map is asserted.
59 physical contacts. B-key gap 12-19 and M-key gap 59-66 are excluded.
Other B-key WWAN/USB/PCIe, A/E-key, B+M PCIe x2 modules, newer revisions and device-specific option wiring are not established.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

Transcend MTS400 B+M-key SATA SSD — source-scoped contact map
Pin	Signal	What it does	Status
1	CONFIG_3	Control, detection or configuration connection; check the source and device.	Device-specific Sources
2	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
3	GND	Ground reference and return.	Device-specific Sources
4	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
5	NC	Not connected or absent in this named wiring.	Not connected Sources
6	NC	Not connected or absent in this named wiring.	Not connected Sources
7	NC	Not connected or absent in this named wiring.	Not connected Sources
8	NC	Not connected or absent in this named wiring.	Not connected Sources
9	NC	Not connected or absent in this named wiring.	Not connected Sources
10	DAS/DSS	Control, detection or configuration connection; check the source and device.	Device-specific Sources
11	NC	Not connected or absent in this named wiring.	Not connected Sources
20	NC	Not connected or absent in this named wiring.	Not connected Sources
21	CONFIG_0	Control, detection or configuration connection; check the source and device.	Device-specific Sources
22	NC	Not connected or absent in this named wiring.	Not connected Sources
23	NC	Not connected or absent in this named wiring.	Not connected Sources
24	NC	Not connected or absent in this named wiring.	Not connected Sources
25	NC	Not connected or absent in this named wiring.	Not connected Sources
26	NC	Not connected or absent in this named wiring.	Not connected Sources
27	GND	Ground reference and return.	Device-specific Sources
28	NC	Not connected or absent in this named wiring.	Not connected Sources
29	NC	Not connected or absent in this named wiring.	Not connected Sources
30	NC	Not connected or absent in this named wiring.	Not connected Sources
31	NC	Not connected or absent in this named wiring.	Not connected Sources
32	NC	Not connected or absent in this named wiring.	Not connected Sources
33	GND	Ground reference and return.	Device-specific Sources
34	NC	Not connected or absent in this named wiring.	Not connected Sources
35	NC	Not connected or absent in this named wiring.	Not connected Sources
36	NC	Not connected or absent in this named wiring.	Not connected Sources
37	NC	Not connected or absent in this named wiring.	Not connected Sources
38	DEVSLP	Control, detection or configuration connection; check the source and device.	Device-specific Sources
39	GND	Ground reference and return.	Device-specific Sources
40	NC	Not connected or absent in this named wiring.	Not connected Sources
41	TX+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
42	NC	Not connected or absent in this named wiring.	Not connected Sources
43	TX-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
44	NC	Not connected or absent in this named wiring.	Not connected Sources
45	GND	Ground reference and return.	Device-specific Sources
46	NC	Not connected or absent in this named wiring.	Not connected Sources
47	RX-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
48	NC	Not connected or absent in this named wiring.	Not connected Sources
49	RX+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
50	NC	Not connected or absent in this named wiring.	Not connected Sources
51	GND	Ground reference and return.	Device-specific Sources
52	NC	Not connected or absent in this named wiring.	Not connected Sources
53	NC	Not connected or absent in this named wiring.	Not connected Sources
54	NC	Not connected or absent in this named wiring.	Not connected Sources
55	NC	Not connected or absent in this named wiring.	Not connected Sources
56	MFG1	Control, detection or configuration connection; check the source and device.	Device-specific Sources
57	GND	Ground reference and return.	Device-specific Sources
58	MFG2	Control, detection or configuration connection; check the source and device.	Device-specific Sources
67	NC	Not connected or absent in this named wiring.	Not connected Sources
68	NC	Not connected or absent in this named wiring.	Not connected Sources
69	CONFIG_1	Control, detection or configuration connection; check the source and device.	Device-specific Sources
70	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
71	GND	Ground reference and return.	Device-specific Sources
72	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
73	GND	Ground reference and return.	Device-specific Sources
74	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
75	CONFIG_2	Control, detection or configuration connection; check the source and device.	Device-specific Sources

Sources (1)

S712 · Transcend Information, Inc. · MTS400 SATA III 6Gb/s M.2 SSD Datasheet
V1.9, 2015-10-01 (revision history PDF p.15) · PDF p.6, Pin Assignments table and four footnotes; p.5 mechanical card form

Kontron KWS 3000-ADL M-key NVMe socket (PCIe x4)

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Table 24 socket diagram and numbered contacts; key M positions 59-66 have no pins. The manual does not establish a card-back mirror.

P030 M.2 — **Partial**, with separate M-key and B+M variants — A: EKF M-key host and Transcend MTS400 B+M SATA module. B: Kontron M-key host and Apacer SV250-M242 B+M SATA module. Both represent 67 M-key contacts and 59 B+M contacts, omitting the mechanical gaps. Lane/pair positions and polarities align, but TX/RX wording uses source perspectives and optional sidebands differ: EKF implements SMBus/alert, wake/detect and suspend-clock assignments absent or reserved on Kontron. B+M configuration, supply, ground, activity and SATA pair positions align; manufacturing/reserved functions are product-specific. Apacer's introductory key-count sentence contradicts its explicit removed-position rows; B preserves the discrepancy and three uncertain functions. Different manufacturers/documents; no universal B-key or B+M PCIe map is asserted.
Source explicitly excludes SATA mode on this socket.
Apacer section 3 says 12 locations are used for mechanical keys, but Table 3-1 explicitly removes 12-19 and 59-66 (16 numbered positions). This pass follows the explicit rows: 59 electrical contacts. It does not silently correct the introductory sentence.
A generic B-key socket, B+M PCIe module, M-key SATA module, power limits, and all protocol support beyond the two named implementations were not established.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

Kontron KWS 3000-ADL M-key NVMe socket (PCIe x4) — source-scoped contact map
Pin	Signal	What it does	Status
1	GND	Ground reference and return.	Device-specific Sources
2	+3.3V	Power connection (+3.3V). Check the specified supply.	Device-specific Sources
3	GND	Ground reference and return.	Device-specific Sources
4	+3.3V	Power connection (+3.3V). Check the specified supply.	Device-specific Sources
5	PCIe RX 3-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
6	NC	Not connected or absent in this named wiring.	Not connected Sources
7	PCIe RX 3+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
8	NC	Not connected or absent in this named wiring.	Not connected Sources
9	GND	Ground reference and return.	Device-specific Sources
10	LED SSD	Control, detection or configuration connection; check the source and device.	Device-specific Sources
11	PCIe TX 3-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
12	+3.3V	Power connection (+3.3V). Check the specified supply.	Device-specific Sources
13	PCIe TX 3+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
14	+3.3V	Power connection (+3.3V). Check the specified supply.	Device-specific Sources
15	GND	Ground reference and return.	Device-specific Sources
16	+3.3V	Power connection (+3.3V). Check the specified supply.	Device-specific Sources
17	PCIe RX 2-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
18	+3.3V	Power connection (+3.3V). Check the specified supply.	Device-specific Sources
19	PCIe RX 2+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
20	NC	Not connected or absent in this named wiring.	Not connected Sources
21	GND	Ground reference and return.	Device-specific Sources
22	NC	Not connected or absent in this named wiring.	Not connected Sources
23	PCIe TX 2-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
24	NC	Not connected or absent in this named wiring.	Not connected Sources
25	PCIe TX 2+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
26	NC	Not connected or absent in this named wiring.	Not connected Sources
27	GND	Ground reference and return.	Device-specific Sources
28	NC	Not connected or absent in this named wiring.	Not connected Sources
29	PCIe RX 1-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
30	NC	Not connected or absent in this named wiring.	Not connected Sources
31	PCIe RX 1+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
32	NC	Not connected or absent in this named wiring.	Not connected Sources
33	GND	Ground reference and return.	Device-specific Sources
34	NC	Not connected or absent in this named wiring.	Not connected Sources
35	PCIe TX 1-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
36	NC	Not connected or absent in this named wiring.	Not connected Sources
37	PCIe TX 1+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
38	NC	Not connected or absent in this named wiring.	Not connected Sources
39	GND	Ground reference and return.	Device-specific Sources
40	NC	Not connected or absent in this named wiring.	Not connected Sources
41	PCIe RX 0-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
42	NC	Not connected or absent in this named wiring.	Not connected Sources
43	PCIe RX 0+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
44	NC	Not connected or absent in this named wiring.	Not connected Sources
45	GND	Ground reference and return.	Device-specific Sources
46	NC	Not connected or absent in this named wiring.	Not connected Sources
47	PCIe TX 0-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
48	NC	Not connected or absent in this named wiring.	Not connected Sources
49	PCIe TX 0+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
50	PERST#	Reset control; check active level and the named device.	Device-specific Sources
51	GND	Ground reference and return.	Device-specific Sources
52	CLKREQ#	Clock or clock-control connection, as named by this source.	Device-specific Sources
53	REFCLK-	Clock or clock-control connection, as named by this source.	Device-specific Sources
54	Reserved	Reserved; no general-purpose wiring is established.	Device-specific Sources
55	REFCLK+	Clock or clock-control connection, as named by this source.	Device-specific Sources
56	NC	Not connected or absent in this named wiring.	Not connected Sources
57	GND	Ground reference and return.	Device-specific Sources
58	NC	Not connected or absent in this named wiring.	Not connected Sources
67	NC	Not connected or absent in this named wiring.	Not connected Sources
68	NC	Not connected or absent in this named wiring.	Not connected Sources
69	NC	Not connected or absent in this named wiring.	Not connected Sources
70	+3.3V	Power connection (+3.3V). Check the specified supply.	Device-specific Sources
71	GND	Ground reference and return.	Device-specific Sources
72	+3.3V	Power connection (+3.3V). Check the specified supply.	Device-specific Sources
73	GND	Ground reference and return.	Device-specific Sources
74	+3.3V	Power connection (+3.3V). Check the specified supply.	Device-specific Sources
75	GND	Ground reference and return.	Device-specific Sources

Sources (1)

S713 · Kontron · KWS 3000-ADL User Guide
Rev 1.2, October 6, 2023; Doc. ID 1069-9087 · p. 48, section 13.1.7, Table 24 M.2 Key M Socket Pin Assignment

Apacer SV250-M242 B+M SATA module

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Figure 3-1 TOP VIEW: contacts at bottom, mounting hole at top, M notch left, B notch right, pin 1 at far right. Do not transfer this top view to the back of the card.

P030 M.2 — **Partial**, with separate M-key and B+M variants — A: EKF M-key host and Transcend MTS400 B+M SATA module. B: Kontron M-key host and Apacer SV250-M242 B+M SATA module. Both represent 67 M-key contacts and 59 B+M contacts, omitting the mechanical gaps. Lane/pair positions and polarities align, but TX/RX wording uses source perspectives and optional sidebands differ: EKF implements SMBus/alert, wake/detect and suspend-clock assignments absent or reserved on Kontron. B+M configuration, supply, ground, activity and SATA pair positions align; manufacturing/reserved functions are product-specific. Apacer's introductory key-count sentence contradicts its explicit removed-position rows; B preserves the discrepancy and three uncertain functions. Different manufacturers/documents; no universal B-key or B+M PCIe map is asserted.
Only contacts outside 12-19 and 59-66 are included; the removed key positions are listed separately in notes.
Apacer section 3 says 12 locations are used for mechanical keys, but Table 3-1 explicitly removes 12-19 and 59-66 (16 numbered positions). This pass follows the explicit rows: 59 electrical contacts. It does not silently correct the introductory sentence.
A generic B-key socket, B+M PCIe module, M-key SATA module, power limits, and all protocol support beyond the two named implementations were not established.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

Apacer SV250-M242 B+M SATA module — source-scoped contact map
Pin	Signal	What it does	Status
1	CONFIG_3	Control, detection or configuration connection; check the source and device.	Device-specific Sources
2	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
3	GND	Ground reference and return.	Device-specific Sources
4	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
5	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
6	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
7	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
8	Not confirmed	No settled assignment. Do not wire from this row.	Unverified Sources
9	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
10	DAS/DSS	Control, detection or configuration connection; check the source and device.	Device-specific Sources
11	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
20	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
21	CONFIG_0	Control, detection or configuration connection; check the source and device.	Device-specific Sources
22	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
23	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
24	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
25	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
26	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
27	GND	Ground reference and return.	Device-specific Sources
28	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
29	PERn1	Not connected or absent in this named wiring.	Not connected Sources
30	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
31	PERp1	Not connected or absent in this named wiring.	Not connected Sources
32	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
33	GND	Ground reference and return.	Device-specific Sources
34	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
35	PETn1	Not connected or absent in this named wiring.	Not connected Sources
36	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
37	PETp1	Not connected or absent in this named wiring.	Not connected Sources
38	DEVSLP	Control, detection or configuration connection; check the source and device.	Device-specific Sources
39	GND	Ground reference and return.	Device-specific Sources
40	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
41	SATA-Rx+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
42	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
43	SATA-Rx-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
44	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
45	GND	Ground reference and return.	Device-specific Sources
46	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
47	SATA-Tx-	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
48	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
49	SATA-Tx+	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
50	PERST#	Not connected or absent in this named wiring.	Not connected Sources
51	GND	Ground reference and return.	Device-specific Sources
52	CLKREQ#	Not connected or absent in this named wiring.	Not connected Sources
53	REFCLKN	Not connected or absent in this named wiring.	Not connected Sources
54	PEWAKE#	Not connected or absent in this named wiring.	Not connected Sources
55	REFCLKP	Not connected or absent in this named wiring.	Not connected Sources
56	Not confirmed	No settled assignment. Do not wire from this row.	Unverified Sources
57	GND	Ground reference and return.	Device-specific Sources
58	Not confirmed	No settled assignment. Do not wire from this row.	Unverified Sources
67	No connect / Not available	Not connected or absent in this named wiring.	Not connected Sources
68	SUSCLK	Not connected or absent in this named wiring.	Not connected Sources
69	CONFIG_1	Control, detection or configuration connection; check the source and device.	Device-specific Sources
70	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
71	GND	Ground reference and return.	Device-specific Sources
72	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
73	GND	Ground reference and return.	Device-specific Sources
74	3.3V	Power connection (3.3V). Check the specified supply.	Device-specific Sources
75	CONFIG_2	Control, detection or configuration connection; check the source and device.	Device-specific Sources

Sources (1)

S714 · Apacer Technology Inc. · Industrial SV250-M242 BiCS5 Product Specifications
Version 1.7, November 24, 2025 · printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 1; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 2; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 3; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 4; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 5; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 6; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 7; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 8; note 1 on printed p. 7; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 9; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 10; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 11; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 20; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 21; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 22; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 23; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 24; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 25; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 26; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 27; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 28; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 29; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 30; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 31; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 32; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 33; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 34; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 35; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 36; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 37; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 38; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 39; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 40; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 41; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 42; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 43; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 44; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 45; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 46; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 47; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 48; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 49; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 50; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 51; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 52; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 53; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 54; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 55; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 56; note 1 on printed p. 7; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 57; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 58; note 1 on printed p. 7; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 67; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 68; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 69; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 70; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 71; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 72; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 73; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 74; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 75

Unknowns stay unknown.

No independently reviewed M.2 mechanical standard, contact count or assignment is published here.
Nominal module labels are not mating dimensions, tolerances, component-clearance measurements or a cutout drawing.
The exact host’s wired interface, CPU, firmware, module clearance and shared resources still require checking.
A passive-looking adapter or a matching key does not establish SATA conversion, lane availability or boot support.

Your next step

Use the detail without guessing past its limits.

Read the connector field note Recognition clues and practical checks.Work through a connection Keep exact equipment and cable requirements separate.

Source trail

Claims and sources

C030Asource checked

M.2 physical fit and keying do not establish whether a host supports a particular SATA, PCIe or NVMe device.

Kingston · SSD FAQ ↗
M.2 physical sizes, B/M keys, host compatibility and hot-plug questions · Historical throughput examples and broad product marketing are not used.

C030Bsource checked

Dell’s version-12 article illustrates 2242 as a nominal 22 × 42 mm module and 2280 as a nominal 22 × 80 mm module. These are module-format examples, not socket mating dimensions.

Dell · Differences Between M.2 Cards: M.2 Slots, Keys, Sizes and Types ↗
Article 000144170, version 12; last modified 30 September 2026. M.2 Cards section, Figure 1 examples (b), (c) and (d). · The general key/capability table is not adopted as a universal host rule. No Dell artwork, measured geometry, tolerance, contact assignment or exact-host approval is supplied.

C030Csource checked

ATP distinguishes M.2 keying from the interface actually wired to a socket: a mechanically matching key alone does not establish SATA or PCIe support.

ATP Electronics · What is M.2? Keys and Sockets Explained ↗
Published 22 June 2026; sections on keying versus wiring, compatibility checklist, mechanical clearance and firmware. No numbered revision stated. · Manufacturer explanatory guide, not an inspected PCI-SIG M.2 standard. Numeric notch/contact positions, marketing throughput, capacity and universal key-to-protocol rules are not adopted. No third-party illustrations are copied.

C030Dsource checked

ATP calls for checking module length, mounting position and vertical/component clearance, including single- versus double-sided construction, separately from keying.

C030Esource checked

ATP separates firmware support for NVMe boot from mechanical fit and advises against treating ordinary M.2 installation as hot-plugging. Follow the exact equipment’s power-off and service instructions.

C030Fsource checked

The ASUS PRIME B550-PLUS AC-HES manual lists M.2_1 with SATA and PCIe x4 modes: PCIe 4.0 for the named Ryzen 5000/3000 desktop families, and PCIe 3.0 for the named 5000 G-Series/4000 G-Series families.

ASUS · PRIME B550-PLUS AC-HES User’s Manual ↗
E18712, First Edition, July 2021; specification summary printed vi–vii and layout 1-2. PDF pages 2, 6, 7 and 12 visually inspected. · Not the ordinary PRIME B550-PLUS or every B550 motherboard. Selected internal groups only; no current BIOS verification, boot qualification, entire port inventory or hardware test. Manual conditions must not be generalized.

C030Gsource checked

On the same AC-HES board, the chipset-connected M.2_2 is specified for PCIe 3.0 x4 and SATA; both M.2 slot entries list 2242, 2260, 2280 and 22110 modules.

C802Ysource checked

EKF S82-P6 NVMe PCIe x4 M-Key socket: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

EKF Elektronik GmbH · Technical Information S82-P6: M.2 NVMe SSD Storage / Backplane Gigabit Ethernet NICs ↗
pp.17-18, NVMe PCIe x4 M.2 M-Key (pins 1-38 and 39-75), EKF Part #255.50.2.2223.10 · Source scope and unresolved evidence are preserved in the engineering variant.

C802Zsource checked

Transcend MTS400 B+M-key SATA SSD: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Transcend Information, Inc. · MTS400 SATA III 6Gb/s M.2 SSD Datasheet ↗
PDF p.6, Pin Assignments table and four footnotes; p.5 mechanical card form · Source scope and unresolved evidence are preserved in the engineering variant.

C803Asource checked

Kontron KWS 3000-ADL M-key NVMe socket (PCIe x4): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Kontron · KWS 3000-ADL User Guide ↗
p. 48, section 13.1.7, Table 24 M.2 Key M Socket Pin Assignment · Source scope and unresolved evidence are preserved in the engineering variant.

C803Bsource checked

Apacer SV250-M242 B+M SATA module: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Apacer Technology Inc. · Industrial SV250-M242 BiCS5 Product Specifications ↗
printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 1; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 10; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 11; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 2; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 20; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 21; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 22; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 3; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 4; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 5; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 6; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 7; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 8; note 1 on printed p. 7; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 9; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 23; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 24; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 25; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 26; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 27; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 28; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 29; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 30; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 31; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 32; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 33; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 34; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 35; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 36; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 37; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 38; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 39; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 40; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 41; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 42; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 43; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 44; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 45; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 46; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 47; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 48; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 49; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 50; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 51; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 52; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 53; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 54; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 55; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 56; note 1 on printed p. 7; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 57; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 58; note 1 on printed p. 7; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 67; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 68; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 69; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 70; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 71; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 72; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 73; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 74; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 75; printed pp. 5-7 (PDF pp. 6-8), section 3, Table 3-1 and Figure 3-1 top view · Source scope and unresolved evidence are preserved in the engineering variant.

8 source records support this profile. No independent engineering review or hardware validation is claimed.

Discovery Quality III

Questions this record helps answer

All focused explainers →

Mini PCIe vs mSATA vs M.2If Mini PCIe and mSATA can share a 52-position socket form, does that make them interchangeable—and how does M.2 differ?

Evidence behind this page

Scope first. Source second. Approval separate.

8 linked sources · 11 scoped claims · 0 sources with inspection/access flags.

Page scope: No V79 drawing added. The existing M.2 recognition schematic is not to scale and has unnumbered illustrative marks, not electrical assignments.

Assessment 2026-10-22 · earliest scheduled source review 2026-12-30. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 8 source scopes, access limits and dates

S033 · SSD FAQ

Kingston · Manufacturer / product-owner domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: M.2 physical fit does not establish SATA / PCIe / NVMe support.

Not established / limitations: Historical throughput examples and broad product marketing are not used.

Locator: M.2 physical sizes, B/M keys, host compatibility and hot-plug questions

S426 · Differences Between M.2 Cards: M.2 Slots, Keys, Sizes and Types

Dell · Manufacturer / product-owner domain · inspected 2026-10-08 · due 2027-01-06

Within inspection window

Scoped support: Nominal module-format examples 2242 and 2280; not connector mating dimensions.

Not established / limitations: The general key/capability table is not adopted as a universal host rule. No Dell artwork, measured geometry, tolerance, contact assignment or exact-host approval is supplied.

Locator: Article 000144170, version 12; last modified 30 September 2026. M.2 Cards section, Figure 1 examples (b), (c) and (d).

S427 · What is M.2? Keys and Sockets Explained

ATP Electronics · Unclassified publisher domain · inspected 2026-10-08 · due 2027-01-06

Within inspection window

Scoped support: Separating mechanical key/format, wired interface, lane implementation, clearance and firmware requirements.

Not established / limitations: Manufacturer explanatory guide, not an inspected PCI-SIG M.2 standard. Numeric notch/contact positions, marketing throughput, capacity and universal key-to-protocol rules are not adopted. No third-party illustrations are copied.

Locator: Published 22 June 2026; sections on keying versus wiring, compatibility checklist, mechanical clearance and firmware. No numbered revision stated.

S429 · PRIME B550-PLUS AC-HES User’s Manual

ASUS · Manufacturer / product-owner domain · inspected 2026-10-08 · due 2027-01-06

Within inspection window

Scoped support: Selected storage and PCIe slot roles for PRIME B550-PLUS AC-HES only, with CPU, slot population and SATA-sharing conditions.

Not established / limitations: Not the ordinary PRIME B550-PLUS or every B550 motherboard. Selected internal groups only; no current BIOS verification, boot qualification, entire port inventory or hardware test. Manual conditions must not be generalized.

Locator: E18712, First Edition, July 2021; specification summary printed vi–vii and layout 1-2. PDF pages 2, 6, 7 and 12 visually inspected.

S711 · Technical Information S82-P6: M.2 NVMe SSD Storage / Backplane Gigabit Ethernet NICs

EKF Elektronik GmbH · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: pp.17-18, NVMe PCIe x4 M.2 M-Key (pins 1-38 and 39-75), EKF Part #255.50.2.2223.10

S712 · MTS400 SATA III 6Gb/s M.2 SSD Datasheet

Transcend Information, Inc. · Manufacturer / product-owner domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: PDF p.6, Pin Assignments table and four footnotes; p.5 mechanical card form

S713 · KWS 3000-ADL User Guide

Kontron · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: p. 48, section 13.1.7, Table 24 M.2 Key M Socket Pin Assignment

S714 · Industrial SV250-M242 BiCS5 Product Specifications

Apacer Technology Inc. · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 1; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 10; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 11; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 2; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 20; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 21; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 22; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 3; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 4; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 5; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 6; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 7; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 8; note 1 on printed p. 7; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 9; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 23; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 24; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 25; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 26; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 27; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 28; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 29; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 30; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 31; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 32; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 33; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 34; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 35; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 36; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 37; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 38; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 39; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 40; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 41; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 42; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 43; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 44; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 45; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 46; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 47; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 48; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 49; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 50; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 51; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 52; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 53; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 54; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 55; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 56; note 1 on printed p. 7; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 57; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 58; note 1 on printed p. 7; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 67; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 68; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 69; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 70; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 71; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 72; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 73; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 74; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 75; printed pp. 5-7 (PDF pp. 6-8), section 3, Table 3-1 and Figure 3-1 top view

Trace 11 claims to their source records

C030A · P030

M.2 physical fit and keying do not establish whether a host supports a particular SATA, PCIe or NVMe device.

Claim scope: Consumer identification / documented standard or product class only

Source links: S033 · Evidence trail → (private workspace)

C030B · P030

Dell’s version-12 article illustrates 2242 as a nominal 22 × 42 mm module and 2280 as a nominal 22 × 80 mm module. These are module-format examples, not socket mating dimensions.

Claim scope: Article 000144170 version 12, Figure 1 examples (b)–(d); no tolerance, connector geometry or clearance inferred.

Source links: S426 · Evidence trail → (private workspace)

C030C · P030

ATP distinguishes M.2 keying from the interface actually wired to a socket: a mechanically matching key alone does not establish SATA or PCIe support.

Claim scope: Manufacturer compatibility checklist; no universal B, M or B+M key-to-protocol mapping or numeric contact positions.

Source links: S427 · Evidence trail → (private workspace)

C030D · P030

ATP calls for checking module length, mounting position and vertical/component clearance, including single- versus double-sided construction, separately from keying.

Claim scope: Physical fit checklist only; no invented height, tolerance, heat-spreader or fabrication dimensions.

Source links: S427 · Evidence trail → (private workspace)

C030E · P030

Claim scope: No claim that every NVMe-capable host can boot every drive; external USB removal is a different operation.

Source links: S427 · Evidence trail → (private workspace)

C030F · P030

Claim scope: E18712 First Edition, printed vii. Only the manual’s named processor families and M.2_1 slot; actual CPU and firmware still require verification.

Source links: S429 · Evidence trail → (private workspace)

C030G · P030

On the same AC-HES board, the chipset-connected M.2_2 is specified for PCIe 3.0 x4 and SATA; both M.2 slot entries list 2242, 2260, 2280 and 22110 modules.

Claim scope: E18712 printed vii, exact board and slot labels; supported nominal lengths do not establish component clearance or boot qualification.

Source links: S429 · Evidence trail → (private workspace)

C802Y · P030

EKF S82-P6 NVMe PCIe x4 M-Key socket: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S711 · Evidence trail → (private workspace)

C802Z · P030

Transcend MTS400 B+M-key SATA SSD: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S712 · Evidence trail → (private workspace)

C803A · P030

Kontron KWS 3000-ADL M-key NVMe socket (PCIe x4): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S713 · Evidence trail → (private workspace)

C803B · P030

Apacer SV250-M242 B+M SATA module: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S714 · Evidence trail → (private workspace)

Prepare this page for review →Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.