FIELD GUIDESource-led reference
Port & Cable

E020 · Source-scoped pinout variants

3.5 mm TRRS connector engineering reference

Physical contact sequence plus explicit CTIA/OMTP assignment ambiguity.

Open field noteSource trail

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

3.5 mm TRRS contact-designation reference original orientation schematic
Original pinout diagram; read the exact variant and view below. Not to scale.

Orientation

How to read this profile

Longitudinal plug view from the exposed tip toward the cable body: Tip → Ring 1 → Ring 2 → Sleeve.

Bounded dimensions

Only what the sources support

Source-scoped dimensions; not fabrication clearances
FieldValueScopeEvidence
Nominal plug family diameter3.5 mmnominal identifier[C020B]

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 contacts4S844 · S844four-position headset-style phone plug physical sequence; nominal engineering count, not automatically positions, population or a device wiring map. four-position headset-style phone plug physical sequence
Positions / cavity span4 (Claim C020B)S844Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Contact-count and assignment-family distinction only; not a device compatibility claim
Populated contacts4 (35RASMT8CHNTRX)S527Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 35RASMT8CHNTRX: TRRS PCB jack. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Four conductors do not equal all solder terminals; switched terminals are not inferred as additional TRRS poles. Quantity means mating conductors, not PCB or switched terminals.
Dimensions / axis3.5 mm Nominal plug family diameterS844Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. nominal_identifier; four-position headset-style phone plug physical sequence
Connector roleplug; socket (Switchcraft 35RASMT8CHNTRX)S844 · S844 · S527Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. four-position headset-style phone plug physical sequence Exact switched jack; no inference that four conductors means four PCB terminals or a particular headset wiring scheme.
Mountingsurface-mount (Claim C020C); surface-mount (Switchcraft 35RASMT8CHNTRX); horizontal surface-mount PCB jack (35RASMT8CHNTRX)S527 · S527Separate exact examples; retain each value’s source, role, axis and part scope. Exact switched jack; no inference that four conductors means four PCB terminals or a particular headset wiring scheme. Exact named example 35RASMT8CHNTRX: TRRS PCB jack. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Four conductors do not equal all solder terminals; switched terminals are not inferred as additional TRRS poles.
Coupling / latchnon-locking (35RASMT8CHNTRX)S527Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 35RASMT8CHNTRX: TRRS PCB jack. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Four conductors do not equal all solder terminals; switched terminals are not inferred as additional TRRS poles.
ManufacturerSwitchcraft (35RASMT8CHNTRX)S527Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Exact switched jack; no inference that four conductors means four PCB terminals or a particular headset wiring scheme.
SeriesTRRS jack (35RASMT8CHNTRX)S527Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Exact switched jack; no inference that four conductors means four PCB terminals or a particular headset wiring scheme.
Exact part / implementation35RASMT8CHNTRX (35RASMT8CHNTRX)S527Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Exact switched jack; no inference that four conductors means four PCB terminals or a particular headset wiring scheme.
View conventionLongitudinal plug view from the exposed tip toward the cable body: Tip → Ring 1 → Ring 2 → Sleeve.S844 · S844Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Existing engineering orientation text; source/part/view remains controlling.

Not recorded: Contact rows, Contact pitch, Contact gender / arrangement, Keying / polarization, Shell / form, Recorded markings. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits
  • V35 does not assign a device to CTIA or OMTP without exact-device evidence.
  • No manufacturing tolerances are published.
  • CTIA / AHJ (LRGM): Plug contact convention; local ordinals from exposed tip toward cable: 1=Tip, 2=Ring 1, 3=Ring 2, 4=Sleeve. ADI CN-0412 uses reverse numbers: source 4=Tip, 3=Ring 1, 2=Ring 2, 1=Sleeve.
  • OMTP (LRMG): Plug contact convention; local ordinals from exposed tip toward cable: 1=Tip, 2=Ring 1, 3=Ring 2, 4=Sleeve. ADI CN-0412 uses reverse numbers: source 4=Tip, 3=Ring 1, 2=Ring 2, 1=Sleeve.
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.

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 variant

CTIA / AHJ (LRGM)

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

View and evidence limits

Plug contact convention; local ordinals from exposed tip toward cable: 1=Tip, 2=Ring 1, 3=Ring 2, 4=Sleeve. ADI CN-0412 uses reverse numbers: source 4=Tip, 3=Ring 1, 2=Ring 2, 1=Sleeve.

  • P020 3.5 mm TRRS — Agree on both CTIA/AHJ (L, R, ground, mic) and OMTP (L, R, mic, ground) — Must be published with both variants.
  • A/V camcorder, balanced headphone, vendor remote and other TRRS allocations are not verified here. Four conductive segments alone do not identify a headset arrangement.
3.5 mm TRRS contact-designation referencePlug contact convention; local ordinals from exposed tip toward cable: 1=Tip, 2=Ring 1, 3=Ring 2, 4=Sleeve. ADI CN-0412 uses reverse numbers: source 4=Tip, 3=Ring 1, 2=Ring 2, 1=Sleeve.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: Tip — Left (device_specific)12: Ring 1 — Right (device_specific)23: Ring 2 — Audio ground (device_specific)34: Sleeve — Microphone (device_specific)4powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
CTIA / AHJ (LRGM) — source-scoped contact map
PinSignalWhat it doesStatus
1Tip — LeftControl, detection or configuration connection; check the source and device.Device-specific
Sources
2Ring 1 — RightControl, detection or configuration connection; check the source and device.Device-specific
Sources
3Ring 2 — Audio groundControl, detection or configuration connection; check the source and device.Device-specific
Sources
4Sleeve — MicrophoneControl, detection or configuration connection; check the source and device.Device-specific
Sources
Sources (3)

OMTP (LRMG)

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

View and evidence limits

Plug contact convention; local ordinals from exposed tip toward cable: 1=Tip, 2=Ring 1, 3=Ring 2, 4=Sleeve. ADI CN-0412 uses reverse numbers: source 4=Tip, 3=Ring 1, 2=Ring 2, 1=Sleeve.

  • P020 3.5 mm TRRS — Agree on both CTIA/AHJ (L, R, ground, mic) and OMTP (L, R, mic, ground) — Must be published with both variants.
  • A/V camcorder, balanced headphone, vendor remote and other TRRS allocations are not verified here. Four conductive segments alone do not identify a headset arrangement.
3.5 mm TRRS contact-designation referencePlug contact convention; local ordinals from exposed tip toward cable: 1=Tip, 2=Ring 1, 3=Ring 2, 4=Sleeve. ADI CN-0412 uses reverse numbers: source 4=Tip, 3=Ring 1, 2=Ring 2, 1=Sleeve.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: Tip — Left (device_specific)12: Ring 1 — Right (device_specific)23: Ring 2 — Microphone (device_specific)34: Sleeve — Audio ground (device_specific)4powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
OMTP (LRMG) — source-scoped contact map
PinSignalWhat it doesStatus
1Tip — LeftControl, detection or configuration connection; check the source and device.Device-specific
Sources
2Ring 1 — RightControl, detection or configuration connection; check the source and device.Device-specific
Sources
3Ring 2 — MicrophoneControl, detection or configuration connection; check the source and device.Device-specific
Sources
4Sleeve — Audio groundControl, detection or configuration connection; check the source and device.Device-specific
Sources
Sources (3)

Unknowns stay unknown.

  • V35 does not assign a device to CTIA or OMTP without exact-device evidence.
  • No manufacturing tolerances are published.

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

C020Asource checked

CTIA and OMTP headset arrangements can assign microphone and ground differently within a 3.5 mm TRRS interface.

Android Open Source Project / Google · 3.5mm headset: Accessory specification ↗
Mechanical table: four-conductor3.5mm plug, CTIA LRGM and OMTP LRMG; Reference headset test circuits introductory paragraph states MIC/GND exchange. · Android accessory requirements only; not a list of supported devices, universal headset compatibility, switch-button compatibility or jack solder-lug layout. Diagram image files were not separately inspected; prose and mechanical table support these claims.

Back to first citation ↑
C020Bsource checked

The referenced CTIA/OMTP headset interface is a four-position 3.5 mm arrangement; matching TRRS geometry does not by itself establish microphone and ground order.

Android Open Source Project / Google · 3.5mm headset: Accessory specification ↗
Mechanical table: four-conductor3.5mm plug, CTIA LRGM and OMTP LRMG; Reference headset test circuits introductory paragraph states MIC/GND exchange. · Android accessory requirements only; not a list of supported devices, universal headset compatibility, switch-button compatibility or jack solder-lug layout. Diagram image files were not separately inspected; prose and mechanical table support these claims.

C802Bsource checked

CTIA / AHJ (LRGM): 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.

Android Open Source Project · 3.5 mm headset: Accessory specification ↗
Mechanical table (CTIA LRGM / OMTP LRMG) and Reference headset test circuits, Figure 1 · Source scope and unresolved evidence are preserved in the engineering variant.

Analog Devices · CN-0412: ADRV-PACKRF Robust Portable Radio Design ↗
p. 8, Audio, Table 2 (OMTP) and Figure 15; p. 8, Audio, Table 3 (AHJ) and Figure 15 · Source scope and unresolved evidence are preserved in the engineering variant.

C802Csource checked

OMTP (LRMG): 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.

Android Open Source Project · 3.5 mm headset: Accessory specification ↗
Mechanical table (CTIA LRGM / OMTP LRMG) and Reference headset test circuits, Figure 1 · Source scope and unresolved evidence are preserved in the engineering variant.

Analog Devices · CN-0412: ADRV-PACKRF Robust Portable Radio Design ↗
p. 8, Audio, Table 2 (OMTP) and Figure 15; p. 8, Audio, Table 3 (AHJ) and Figure 15 · Source scope and unresolved evidence are preserved in the engineering variant.

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

Evidence behind this page

Scope first. Source second. Approval separate.

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

Page scope: Original longitudinal contact-designation schematic; not to scale; CTIA/OMTP circuit assignment intentionally unresolved.

Assessment 2026-10-22 · earliest scheduled source review 2027-01-16. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 4 source scopes, access limits and dates

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

S700 · 3.5 mm headset: Accessory specification

Android Open Source Project · 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: Mechanical table (CTIA LRGM / OMTP LRMG) and Reference headset test circuits, Figure 1

S701 · CN-0412: ADRV-PACKRF Robust Portable Radio Design

Analog Devices · 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. 8, Audio, Table 2 (OMTP) and Figure 15; p. 8, Audio, Table 3 (AHJ) and Figure 15

S844 · 3.5mm headset: Accessory specification

Android Open Source Project / Google · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: The two ordered conductor schemes exchange microphone and ground while retaining the same nominal four-conductor plug form.

Not established / limitations: Android accessory requirements only; not a list of supported devices, universal headset compatibility, switch-button compatibility or jack solder-lug layout. Diagram image files were not separately inspected; prose and mechanical table support these claims.

Locator: Mechanical table: four-conductor3.5mm plug, CTIA LRGM and OMTP LRMG; Reference headset test circuits introductory paragraph states MIC/GND exchange.

Trace 4 claims to their source records

C020A · P020

CTIA and OMTP headset arrangements can assign microphone and ground differently within a 3.5 mm TRRS interface.

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

Source links: S844 · Evidence trail → (private workspace)

C020B · P020

The referenced CTIA/OMTP headset interface is a four-position 3.5 mm arrangement; matching TRRS geometry does not by itself establish microphone and ground order.

Claim scope: Contact-count and assignment-family distinction only; not a device compatibility claim

Source links: S844 · Evidence trail → (private workspace)

C802B · P020

CTIA / AHJ (LRGM): 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 · S700 · S701 · Evidence trail → (private workspace)

C802C · P020

OMTP (LRMG): 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 · S700 · S701 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)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.