Side by side

M8 A-coded versus D-coded

Which M8 coding is documented: A-coded signal/sensor or D-coded data?

Computer-generated illustration, not a photograph. — P249 · ConnectorM8 A-coded 4-position connector

How they differ

M8 A-coded 4-position connector Confirm M8 thread size, A-coding and four-position insert from the exact component or cable documentation before assigning signal use.
M8 D-coded Ethernet connector Read the coding and confirm the four-position D-coded insert rather than identifying the connector from the M8 threaded shell alone.

Then askWhich M8 coding is documented: A-coded signal/sensor or D-coded data?

At a glance

Source-scoped form facts; counts, variants and unknowns are distinct
Field	M8 A-coded 4-position connector	M8 D-coded Ethernet connector
Type	Connector	Connector
Family	Network	Network
Shape	round	round
Nominal contacts	4S269Source-backed nominal position/contact count: 4.	4S270Source-backed nominal position/contact count: 4.
Positions / cavity span	4 (Claim C249A); 4 (Claim C249B); 4 (Claim C249C); 4 (Phoenix Contact 1453481)S269 · S289 · S502 · S502Source-scoped examples are separate; select the exact variant and measured axis. V43 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof. V44 contact-designation/orientation reference only; no universal signal assignment, wire color, voltage/current rating or device compatibility is inferred. V121 named-product or explicitly scoped manufacturer distinction only; no wiring instruction, independent engineering approval or end-to-end compatibility guarantee. Phoenix Contact 1453481. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.	4 (Claim C250A); 4 (Claim C250B); 4 (HARTING 21 02 381 2419)S270 · S289 · S650Source-scoped examples are separate; select the exact variant and measured axis. V43 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof. V44 interface-assignment reference for the documented M8 D-coded PROFINET form; not a guarantee for arbitrary Ethernet equipment or cabling. HARTING 21 02 381 2419. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Contact rows	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector role	Rear-mounted device connector, straight pin side with individual wire tails (Phoenix Contact 1453481)S502Source-scoped examples are separate; select the exact variant and measured axis. Phoenix Contact 1453481. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.	Straight female M8 PCB connector; housing ordered separately (HARTING 21 02 381 2419)S650Source-scoped examples are separate; select the exact variant and measured axis. HARTING 21 02 381 2419. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Key distinction	The M8 threaded shell does not identify coding or function. A- and D-coded inserts are separate keyed forms.	M8 D-coding is a specific keyed data form; it should not be confused with same-shell A-coded M8 connectors.

Full evidence ledger and sources ↓

Illustrations are computer-generated with prior AI visual review; independent technical and rights review pending. A comparison is not a compatibility verdict.

This comparison stays within one evidence layer.

All selected records are Connector records. Similar layer does not mean compatible, interchangeable or safe to mate.

Families represented: Network

Network comparison / concept only

Same count. Different coding.

A device connector is not a substitute network-cable approval.

M8 A-coded →M8 D-coded →

Not a general compatibility verdict. S502 · S270

The reference ledger

Read the same question across.

2 selected records · 13 fields
No score. No compatibility verdict.

On a narrow screen, scroll the table sideways or open the field-by-field reading view below. Illustrations are not a size comparison.

Comparison of selected field notes; source links accompany each documented specification
What you are comparing	P249 / ConnectorM8 A-coded 4-position connector Identification schematic · not to scale · drawing review pending	P250 / ConnectorM8 D-coded Ethernet connector Identification schematic · not to scale · drawing review pending
Layer	Connector	Connector
Key distinction	The M8 threaded shell does not identify coding or function. A- and D-coded inserts are separate keyed forms.	M8 D-coding is a specific keyed data form; it should not be confused with same-shell A-coded M8 connectors.
Nominal contacts	4S269Source-backed nominal position/contact count: 4.	4S270Source-backed nominal position/contact count: 4.
Positions / cavity span	4 (Claim C249A); 4 (Claim C249B); 4 (Claim C249C); 4 (Phoenix Contact 1453481)S269 · S289 · S502 · S502Source-scoped examples are separate; select the exact variant and measured axis. V43 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof. V44 contact-designation/orientation reference only; no universal signal assignment, wire color, voltage/current rating or device compatibility is inferred. V121 named-product or explicitly scoped manufacturer distinction only; no wiring instruction, independent engineering approval or end-to-end compatibility guarantee. Phoenix Contact 1453481. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.	4 (Claim C250A); 4 (Claim C250B); 4 (HARTING 21 02 381 2419)S270 · S289 · S650Source-scoped examples are separate; select the exact variant and measured axis. V43 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof. V44 interface-assignment reference for the documented M8 D-coded PROFINET form; not a guarantee for arbitrary Ethernet equipment or cabling. HARTING 21 02 381 2419. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Populated contacts	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact rows	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact pitch	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Dimensions / axis	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector role	Rear-mounted device connector, straight pin side with individual wire tails (Phoenix Contact 1453481)S502Source-scoped examples are separate; select the exact variant and measured axis. Phoenix Contact 1453481. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.	Straight female M8 PCB connector; housing ordered separately (HARTING 21 02 381 2419)S650Source-scoped examples are separate; select the exact variant and measured axis. HARTING 21 02 381 2419. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Coupling / latch	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Keying / polarization	A coding (Phoenix Contact 1453481)S502Source-scoped examples are separate; select the exact variant and measured axis. Phoenix Contact 1453481. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.	D coding (HARTING 21 02 381 2419)S650Source-scoped examples are separate; select the exact variant and measured axis. HARTING 21 02 381 2419. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Documented identification	4-position/contact recognition fact in the cited implementation.C249A	4-position/contact recognition fact in the cited implementation.C250A
Evidence	C249A,C249C → Independent review pending	C250A,C250C → Independent review pending

Read field by field — no sideways scrolling

The same selected records, fields, values and source links as the table. Missing fields remain non-equivalent; no values are merged.

Layer

M8 A-coded 4-position connectorP249 / Connector: Connector
M8 D-coded Ethernet connectorP250 / Connector: Connector

Key distinction

M8 A-coded 4-position connectorP249 / Connector: The M8 threaded shell does not identify coding or function. A- and D-coded inserts are separate keyed forms.
M8 D-coded Ethernet connectorP250 / Connector: M8 D-coding is a specific keyed data form; it should not be confused with same-shell A-coded M8 connectors.

Nominal contacts

M8 A-coded 4-position connectorP249 / Connector: 4S269Source-backed nominal position/contact count: 4.
M8 D-coded Ethernet connectorP250 / Connector: 4S270Source-backed nominal position/contact count: 4.

Positions / cavity span

M8 A-coded 4-position connectorP249 / Connector: 4 (Claim C249A); 4 (Claim C249B); 4 (Claim C249C); 4 (Phoenix Contact 1453481)S269 · S289 · S502 · S502Source-scoped examples are separate; select the exact variant and measured axis. V43 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof. V44 contact-designation/orientation reference only; no universal signal assignment, wire color, voltage/current rating or device compatibility is inferred. V121 named-product or explicitly scoped manufacturer distinction only; no wiring instruction, independent engineering approval or end-to-end compatibility guarantee. Phoenix Contact 1453481. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
M8 D-coded Ethernet connectorP250 / Connector: 4 (Claim C250A); 4 (Claim C250B); 4 (HARTING 21 02 381 2419)S270 · S289 · S650Source-scoped examples are separate; select the exact variant and measured axis. V43 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof. V44 interface-assignment reference for the documented M8 D-coded PROFINET form; not a guarantee for arbitrary Ethernet equipment or cabling. HARTING 21 02 381 2419. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.

Populated contacts

M8 A-coded 4-position connectorP249 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
M8 D-coded Ethernet connectorP250 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact rows

M8 A-coded 4-position connectorP249 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
M8 D-coded Ethernet connectorP250 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact pitch

M8 A-coded 4-position connectorP249 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
M8 D-coded Ethernet connectorP250 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Dimensions / axis

M8 A-coded 4-position connectorP249 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
M8 D-coded Ethernet connectorP250 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Connector role

M8 A-coded 4-position connectorP249 / Connector: Rear-mounted device connector, straight pin side with individual wire tails (Phoenix Contact 1453481)S502Source-scoped examples are separate; select the exact variant and measured axis. Phoenix Contact 1453481. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
M8 D-coded Ethernet connectorP250 / Connector: Straight female M8 PCB connector; housing ordered separately (HARTING 21 02 381 2419)S650Source-scoped examples are separate; select the exact variant and measured axis. HARTING 21 02 381 2419. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.

Coupling / latch

M8 A-coded 4-position connectorP249 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
M8 D-coded Ethernet connectorP250 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Keying / polarization

M8 A-coded 4-position connectorP249 / Connector: A coding (Phoenix Contact 1453481)S502Source-scoped examples are separate; select the exact variant and measured axis. Phoenix Contact 1453481. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
M8 D-coded Ethernet connectorP250 / Connector: D coding (HARTING 21 02 381 2419)S650Source-scoped examples are separate; select the exact variant and measured axis. HARTING 21 02 381 2419. Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.

Documented identification

M8 A-coded 4-position connectorP249 / Connector: 4-position/contact recognition fact in the cited implementation.C249A
M8 D-coded Ethernet connectorP250 / Connector: 4-position/contact recognition fact in the cited implementation.C250A

Evidence

M8 A-coded 4-position connectorP249 / Connector: C249A,C249C →
Independent review pending
M8 D-coded Ethernet connectorP250 / Connector: C250A,C250C →
Independent review pending

Your next step

Use the distinction in context.

Open the field notes Read source-linked facts and limitations.Compare another pair Start from a common confusion.Check a connection A comparison is not a compatibility verdict.

Continue the distinction

Compare next

Browse every comparison →

M8 D-coded versus M12 D-codedIs the D-coded industrial Ethernet connector M8 or M12? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.M8, M12 and M23 circular familiesWhich circular shell family and coding does the exact equipment specify? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.etherCON versus ordinary 8P8C modularIs the interface a ruggedized locking etherCON system or a conventional 8P8C modular port? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.M12 A-coded versus B-coded versus L-codedWhich M12 coding and intended domain does the equipment documentation specify? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.M12 D-, X- and Y-coded data/hybrid formsDoes the exact interface require D-coded, X-coded or Y-coded M12 rather than merely an M12 shell? Connector identity and manufacturer ratings are only reference layers; exact circuit, wiring, installation and equipment requirements still need qualified documentation.M12 D-coded versus X-coded EthernetWhich M12 coding and position pattern is documented for the Ethernet port? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.

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Evidence behind this page

Scope first. Source second. Approval separate.

5 linked sources · 4 scoped claims · 0 sources with inspection/access flags.

Page scope: Evidence behind the compared records; the editorial comparison still needs separate review.

Assessment 2026-10-22 · earliest scheduled source review 2027-01-04. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 5 source scopes, access limits and dates

S269 · M8 A-coded 4-position device connector

Phoenix Contact · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: Identifies an M8 A-coded, four-position device-side connector; V43 uses only coding/count/form facts.

Not established / limitations: Identification/reference scope only. V43 does not convert this source into a universal pinout, fabrication drawing, electrical approval, protocol guarantee or end-to-end compatibility verdict.

Locator: Product properties

S270 · M8 D-coded PROFINET data connector

Phoenix Contact · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: Identifies a four-position M8 D-coded PROFINET CAT5 data connector; V43 uses form/coding/count context only.

Locator: Product properties

S502 · Phoenix Contact 1453481 — rear-mounted M8 device connector

Phoenix Contact · Manufacturer / product-owner domain · inspected 2026-10-11 · due 2027-01-09

Within inspection window

Scoped support: Named rear-mounted A-coded male device connector and free leads; no inferred wire functions or network protocol.

Not established / limitations: Named rear-mounted A-coded male device connector and free leads; no inferred wire functions or network protocol. No raw HTML or manufacturer image archive is represented as retained.

Locator: Product description; mounting type; product properties; connection data; photograph 241274

S647 · HARTING circular connector coding and application distinctions

HARTING Technology Group · Unclassified publisher domain · inspected 2026-10-15 · due 2027-01-13

Within inspection window

Scoped support: Manufacturer-authored class-level application/coding comparisons; not exact mating, terminal assignments or power ratings for arbitrary parts

Not established / limitations: Visible manufacturer facts are source-scoped and may change; confirm the exact component/revision and documented applicability; no independent technical certification is claimed.

Locator: Circular coding: A-coded, D-coded, K-coded, S-coded, X-coded, Y-coded sections

S650 · HARTING M8 D-coded four-contact PCB connector, article 21 02 381 2419

HARTING Technology Group · Unclassified publisher domain · inspected 2026-10-15 · due 2027-01-13

Within inspection window

Scoped support: One specific PCB adapter; not a cable pinout, other vendor mating claim or broader device certification

Locator: Product details: M8 D coding, four contacts, 10/100 Mbps, IEC 61076-2-114

Trace 4 claims to their source records

C249A · P249

Phoenix Contact identifies part 1453481 as a four-position M8 connector with A-coding.

Claim scope: V43 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof.

Source links: S269 · Evidence trail → (private workspace)

C249C · P249

Phoenix Contact 1453481 is a straight four-position A-coded M8 male device connector for rear mounting, with individual leads; the product listing calls it unshielded. It is not described as a ready-made Ethernet patch cable.

Claim scope: V121 named-product or explicitly scoped manufacturer distinction only; no wiring instruction, independent engineering approval or end-to-end compatibility guarantee.

Source links: S502 · Evidence trail → (private workspace)

C250A · P250

Phoenix Contact identifies part 1323169 as a four-position, D-coded M8 data connector for PROFINET CAT5.

Claim scope: V43 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof.

Source links: S270 · Evidence trail → (private workspace)

C250C · P250

HARTING identifies a four-contact M8 D-coded PCB adapter, with listed 10/100 Mbit/s data use. Sharing the D coding with an M12 product does not make the two differently sized connectors a mating pair.

Claim scope: V178 M8 exact PCB example and M8 versus M12 shell distinction; no pinout or cross-size mating. Original bounded manufacturer paraphrase; publication and technical review pending.

Source links: S647 · S650 · 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.