E001 · Source-scoped pinout variants

USB Type-A engineering reference

USB-IF compliance guidance fixes Standard-A at four contacts. The physical connector does not identify USB generation, negotiated speed, current capability or exact device behavior.

Open field note Source trail

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

USB Type-A engineering reference original orientation schematic — Original pinout diagram; read the exact variant and view below. Not to scale.

Contact count

4

plug and receptacle interface

Mating boundary

Shape is not the verdict.

USB Standard-A plug ↔ USB Standard-A receptacle

Orientation

How to read this profile

Contact count only in V54; no numbered mating-face map is reproduced, avoiding mirrored-orientation mistakes.

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
Nominal contacts	4 (USB 2.0 Standard-A); 9 (USB 3.x Standard-A)S363 · S651 · S652 · S653Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Standard-A contact-count engineering context only. Named nine-contact Standard-A research variant, excluding the shell. Per-contact status and original source scope remain controlling.
Contact rows	1 (Molex 676430910)S970Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. Exact Molex 676430910, female right-angle USB-A USB2 receptacle; manufacturer mating-interface/row fields only, not a universal family value. Quantity context: Manufacturer Number of Rows property.
Contact pitch	2 mm Manufacturer Pitch - Mating Interface; internal gap order and physical projection not further dimensioned (Molex 676430910); 2.5 mm Manufacturer Pitch - Mating Interface; internal gap order and physical projection not further dimensioned (Molex 676430910)S970Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. Exact Molex 676430910, female right-angle USB-A USB2 receptacle; manufacturer mating-interface/row fields only, not a universal family value.
Connector role	plug; socket; socket (614004190021)S002 · S363 · S860 · S874Separate exact examples; retain each value’s source, role, axis and part scope. plug and receptacle interface Exact named example 614004190021: USB 2.0 Standard-A PCB receptacle. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Drawing dimension axes not visually inspected; no shell dimensions or mating pitch proposed.
Mounting	horizontal THT (614004190021)S860 · S874Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 614004190021: USB 2.0 Standard-A PCB receptacle. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Drawing dimension axes not visually inspected; no shell dimensions or mating pitch proposed.
Manufacturer	Würth Elektronik (614004190021)S860 · S874Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 614004190021: USB 2.0 Standard-A PCB receptacle. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Drawing dimension axes not visually inspected; no shell dimensions or mating pitch proposed.
Series	WR-USB Standard (614004190021)S860 · S874Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 614004190021: USB 2.0 Standard-A PCB receptacle. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Drawing dimension axes not visually inspected; no shell dimensions or mating pitch proposed.
Exact part / implementation	614004190021 (614004190021)S860 · S874Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 614004190021: USB 2.0 Standard-A PCB receptacle. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Drawing dimension axes not visually inspected; no shell dimensions or mating pitch proposed.
View convention	SYS-427X manual receptacle-opening drawing: legacy contacts labelled 4 at left and 1 at right; SuperSpeed contacts labelled 5 at left and 9 at right. (WINSYSTEMS SYS-427X J17); SYS-427X manual receptacle-opening drawing: four contacts labelled 4 at left and 1 at right. (WINSYSTEMS SYS-427X J10/J11)S652 · S652Exact source-view examples remain separate from other roles, parts and generated schematics. Exact WINSYSTEMS SYS-427X J17 USB 3.1 Gen 1 Type-A receptacle example, not every Type-A part. Source page pixels inspected2026-10-22; no pitch, dimensions or electrical assignment added. Exact WINSYSTEMS SYS-427X J10/J11 USB2.0 Type-A receptacle example, not every Type-A part. Source page pixels inspected2026-10-22; no pitch, dimensions or electrical assignment added.

Not recorded: Positions / cavity span, Populated contacts, Dimensions / axis, Contact gender / arrangement, Coupling / latch, Keying / polarization, Shell / form, Recorded markings. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits

No V54 contact numbering or electrical assignment map is published.
Connector shape and four-contact count do not identify the USB generation or device capability.
USB 2.0 four-contact Standard-A: Receptacle face: 4 at left, 1 at right, per SYS-427X p. 21.
USB 3.x nine-contact Standard-A: Receptacle face: legacy row 4 left/1 right; SuperSpeed row 5 left/9 right, per SYS-427X p. 20.
Prior view context (not a source-view value): Contact count only in V54; no numbered mating-face map is reproduced, avoiding mirrored-orientation mistakes.

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 variantUSB 2.0 four-contact Standard-A

USB 2.0 four-contact Standard-A

View and evidence limits

Receptacle face: 4 at left, 1 at right, per SYS-427X p. 21.

P001 USB Type-A — Agree (USB 2.0: 4 pins; USB 3.x: 9 pins + shell) — USB-IF specifications reached.
Charge-only, proprietary extra-contact, special A-to-A and later edition exceptions are not established here.

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

USB 2.0 four-contact Standard-A — source-scoped contact map
Pin	Signal	What it does	Status
1	VBUS	USB bus power; voltage and current depend on the device.	Single source Sources
2	D−	Control, detection or configuration connection; check the source and device.	Single source Sources
3	D+	USB 2.0 data, positive side of the pair.	Single source Sources
4	GND	Ground reference and return.	Single source Sources

Sources (3)

S651 · USB 3.0 Promoter Group / USB-IF · USB Type-C Cable and Connector Specification
Release 2.0, August 2019 · p. 78, Table 3-13, USB 2.0 Standard-A plug column
S652 · WINSYSTEMS · SYS-427X Product Manual
v1.3 · p. 21, §8.2.5 J10/J11 USB 2.0 Type-A Connector, face drawing and table
S653 · USB-IF · USB 3.1 Front-Panel Internal Connector and Cable
Revision 1.1 · p. 18, §3.1, Table 3-1, signal descriptions

USB 3.x nine-contact Standard-A

View and evidence limits

Receptacle face: legacy row 4 left/1 right; SuperSpeed row 5 left/9 right, per SYS-427X p. 20.

P001 USB Type-A — Agree (USB 2.0: 4 pins; USB 3.x: 9 pins + shell) — USB-IF specifications reached.
Charge-only, proprietary extra-contact, special A-to-A and later edition exceptions are not established here.

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

USB 3.x nine-contact Standard-A — source-scoped contact map
Pin	Signal	What it does	Status
1	VBUS	USB bus power; voltage and current depend on the device.	Single source Sources
2	D−	Control, detection or configuration connection; check the source and device.	Single source Sources
3	D+	USB 2.0 data, positive side of the pair.	Single source Sources
4	GND	Ground reference and return.	Single source Sources
5	StdA_SSRX−	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
6	StdA_SSRX+	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
7	GND_DRAIN	Control, detection or configuration connection; check the source and device.	Single source Sources
8	StdA_SSTX−	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources
9	StdA_SSTX+	Signal conductor. Pair, polarity and direction follow this named wiring.	Single source Sources

Sources (3)

S651 · USB 3.0 Promoter Group / USB-IF · USB Type-C Cable and Connector Specification
Release 2.0, August 2019 · p. 77, Table 3-12, USB 3.1 Standard-A plug column
S652 · WINSYSTEMS · SYS-427X Product Manual
v1.3 · p. 20, §8.2.4 J17 USB 3.1 Gen 1 Type-A Connector, face drawing and table
S653 · USB-IF · USB 3.1 Front-Panel Internal Connector and Cable
Revision 1.1 · p. 18, §3.1, Table 3-1, host-perspective definitions

Unknowns stay unknown.

No V54 contact numbering or electrical assignment map is published.
Connector shape and four-contact count do not identify the USB generation or device capability.

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

C001Asource checked

USB Type-A has a rectangular mating profile. Legacy and newer USB implementations can use this shape.

Cable Matters · USB connector cable types ↗
USB-A, USB-B and USB-C sections · Do not infer video, power or backward compatibility from this broad guide.

C001Csource checked

USB-IF compliance guidance requires Standard A-series connectors to use exactly four contacts; connector shape and contact count still do not establish the USB data generation or device capability.

USB Implementers Forum (USB-IF) · USB-IF Compliance Updates — Cables and Connectors ↗
USB Connector Construction; Mini Connectors Antiquated; USB 3.x Micro-B Connector Certifications · Compliance and certification status does not establish the data rate, power behavior or supported protocol of a particular device or cable.

C800Asource checked

USB 2.0 four-contact Standard-A: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

USB 3.0 Promoter Group / USB-IF · USB Type-C Cable and Connector Specification ↗
p. 30, §2.1, Figure 2-1 (Receptacle Interface, Front View); p. 310, Table A-1, Location on 3.5 mm Jack and CTIA/OMTP notes; p. 56, §3.2.2.1, USB 2.0 receptacle contact-population paragraph; p. 68, §3.2.3, Table 3-4 and notes; p. 69, Table 3-5 and notes 1–5; p. 77, Table 3-12, USB 3.1 Standard-A plug column; p. 78, Table 3-13, USB 2.0 Standard-A plug column; pp. 309–310 Appendix A; pp. 350–352 Appendix E; pp. 32–34, §2.3 Configuration Process · Source scope and unresolved evidence are preserved in the engineering variant.

WINSYSTEMS · SYS-427X Product Manual ↗
p. 20, §8.2.4 J17 USB 3.1 Gen 1 Type-A Connector, face drawing and table; p. 21, §8.2.5 J10/J11 USB 2.0 Type-A Connector, face drawing and table; p. 22, §8.2.6 J18/J19 Display Ports, face drawings and 20-row table · Source scope and unresolved evidence are preserved in the engineering variant.

USB-IF · USB 3.1 Front-Panel Internal Connector and Cable ↗
p. 18, §3.1, Table 3-1, host-perspective definitions; p. 18, §3.1, Table 3-1, signal descriptions · Source scope and unresolved evidence are preserved in the engineering variant.

C800Bsource checked

USB 3.x nine-contact Standard-A: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

C001Wsource checked

Molex specifies 676430910 as a USB-A USB2 receptacle, 4 loaded circuits and 1 row(s), with mating-interface pitch 2.00mm, 2.50mm.

Molex · Molex 67643 series chart, exact 676430910 USB-A USB2 receptacle ↗
Full Export Spreadsheet table, exact 676430910 row: Web Description, Gender, Circuits Loaded, Number of Rows, Pitch - Mating Interface and separate Pitch - Termination Interface columns. Full official chart read; no PDF drawing pixels acquired. · Both 2.00 and 2.50 mm are in the one mating-pitch cell. No ordered gap pattern or uniform pitch asserted without a dimensioned drawing. Product detail page says Limited Information Available; chart fields retained without measured/toleranced drawing.

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

Evidence behind this page

Scope first. Source second. Approval separate.

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

Page scope: No V54 engineering drawing is published for this profile; the sidecar is intentionally limited to source-backed contact/interface context.

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 6 source scopes, access limits and dates

S002 · USB connector cable types

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

Within inspection window

Scoped support: Narrow physical identification.

Not established / limitations: Do not infer video, power or backward compatibility from this broad guide.

Locator: USB-A, USB-B and USB-C sections

S363 · USB-IF Compliance Updates — Cables and Connectors

USB Implementers Forum (USB-IF) · Standards-organization domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: USB 2.0 Standard-A/Standard-B exact four-contact requirement, Mini-B and Micro-B exact five-contact requirement, plus current USB-IF certification-status context for legacy connector families.

Not established / limitations: Compliance and certification status does not establish the data rate, power behavior or supported protocol of a particular device or cable.

Locator: USB Connector Construction; Mini Connectors Antiquated; USB 3.x Micro-B Connector Certifications

S651 · USB Type-C Cable and Connector Specification

USB 3.0 Promoter Group / USB-IF · Standards-organization domain · inspected 2026-10-18 · due 2027-01-16

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. 30, §2.1, Figure 2-1 (Receptacle Interface, Front View); p. 310, Table A-1, Location on 3.5 mm Jack and CTIA/OMTP notes; p. 56, §3.2.2.1, USB 2.0 receptacle contact-population paragraph; p. 68, §3.2.3, Table 3-4 and notes; p. 69, Table 3-5 and notes 1–5; p. 77, Table 3-12, USB 3.1 Standard-A plug column; p. 78, Table 3-13, USB 2.0 Standard-A plug column; pp. 309–310 Appendix A; pp. 350–352 Appendix E; pp. 32–34, §2.3 Configuration Process

S652 · SYS-427X Product Manual

WINSYSTEMS · Unclassified publisher domain · inspected 2026-10-18 · due 2027-01-16

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. 20, §8.2.4 J17 USB 3.1 Gen 1 Type-A Connector, face drawing and table; p. 21, §8.2.5 J10/J11 USB 2.0 Type-A Connector, face drawing and table; p. 22, §8.2.6 J18/J19 Display Ports, face drawings and 20-row table

S653 · USB 3.1 Front-Panel Internal Connector and Cable

USB-IF · Standards-organization domain · inspected 2026-10-18 · due 2027-01-16

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. 18, §3.1, Table 3-1, host-perspective definitions; p. 18, §3.1, Table 3-1, signal descriptions

S970 · Molex 67643 series chart, exact 676430910 USB-A USB2 receptacle

Molex · Manufacturer / product-owner domain · inspected 2026-10-22 · due 2027-01-20

Within inspection window

Scoped support: Exact 676430910 specification row only.

Not established / limitations: Both 2.00 and 2.50 mm are in the one mating-pitch cell. No ordered gap pattern or uniform pitch asserted without a dimensioned drawing. Product detail page says Limited Information Available; chart fields retained without measured/toleranced drawing.

Locator: Full Export Spreadsheet table, exact 676430910 row: Web Description, Gender, Circuits Loaded, Number of Rows, Pitch - Mating Interface and separate Pitch - Termination Interface columns. Full official chart read; no PDF drawing pixels acquired.

Trace 5 claims to their source records

C001A · P001

USB Type-A has a rectangular mating profile. Legacy and newer USB implementations can use this shape.

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

Source links: S002 · Evidence trail → (private workspace)

C001C · P001

USB-IF compliance guidance requires Standard A-series connectors to use exactly four contacts; connector shape and contact count still do not establish the USB data generation or device capability.

Claim scope: Standard-A contact-count engineering context only.

Source links: S363 · Evidence trail → (private workspace)

C001W · P001

Molex specifies 676430910 as a USB-A USB2 receptacle, 4 loaded circuits and 1 row(s), with mating-interface pitch 2.00mm, 2.50mm.

Claim scope: Exact Molex 676430910, female right-angle USB-A USB2 receptacle; manufacturer mating-interface/row fields only, not a universal family value.

Source links: S970 · Evidence trail → (private workspace)

C800A · P001

USB 2.0 four-contact Standard-A: 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: S651 · S652 · S653 · Evidence trail → (private workspace)

C800B · P001

USB 3.x nine-contact Standard-A: 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: S651 · S652 · S653 · 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.