P020 / Audio / Connector
CTIA and OMTP headset arrangements can assign microphone and ground differently within a 3.5 mm TRRS interface.
Also called TRRS headset jack 4 pole 3.5mm CTIA OMTP
Four matching contacts can still be wired differently.
A TRRS plug has one more insulating band than TRS. That visible distinction does not identify CTIA or OMTP; obtain the equipment specification.
Claim inspection dates: 2026-10-11, 2026-10-21 · Independent review pending
Three-quarter view Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.
Mating face Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.
Recognition drawing Original schematic, not to scale. Drawing review pending.
Pins & wiring
Choose the exact wiring. Pin numbers follow its stated view; a schematic does not establish physical positions. Check your exact device before wiring.
Field answer / P020 · Source-checked, human review pending
First answerCTIA and OMTP headset arrangements can assign microphone and ground differently within a 3.5 mm TRRS interface.
Next observation: Confirm the headset contact arrangement and jack role from both device specifications before choosing an explicitly documented adapter.
The visible TRRS contact format does not determine CTIA versus OMTP microphone/ground assignment or an equipment jack’s role. An exact product warning must not be applied to every audio device.
These are the existing, individually scoped observations—not fresh source inspections, a universal pinout, approved geometry or a device-specific compatibility verdict.
C020A / canonical evidence anchor — CTIA and OMTP headset arrangements can assign microphone and ground differently within a 3.5 mm TRRS interface.
S844 · Android Open Source Project / Google
Consumer identification / documented standard or product class only · source checked; independent sign-off pending.
C020C / canonical evidence anchor — Switchcraft identifies 35RASMT8CHNTRX as a four-conductor TRRS jack with tip/ring switching, horizontal mounting and surface-mount PC termination.
Exact switched jack; no inference that four conductors means four PCB terminals or a particular headset wiring scheme. · source checked; independent sign-off pending.
C020D / canonical evidence anchor — Focusrite cautions that TS or TRRS headphones and adapters are unlikely to work properly with the Scarlett Solo 4th Gen headphone output and directs users to TRS headphones and adapters.
Manufacturer warning for the named interface only; not a universal exclusion of TRRS headphones from all audio devices. · source checked; independent sign-off pending.
Shape, plug/socket view, contact roles and exact model capability must be checked separately. Review source authority and publication status ↓
Image inspection / P020
2 registered views for this reference. Different part examples are not automatically mates; all remain not to scale and independently unapproved.
(private workspace)P020 / Source-observed physical study
Switchcraft 35RASMT8CHNTRX / shared CHNTRX photo
Oblique board-mount jack exterior · Device receptacle
Not to scale. Technical and rights review pending.
Inspect view & provenance (private workspace)Keep their component sides and part examples separate.
(private workspace)P020 / Inherited recognition study
3.5 mm TRRS connector
Side exterior of cable plug; longitudinal insulator cues · Cable plug / cable end
Not to scale. Technical and rights review pending.
Inspect view & provenance (private workspace)Flagship atlas AUDIO / PIN ARRANGEMENT
A four-contact 3.5 mm headset plug does not uniquely identify the microphone/ground arrangement. CTIA and OMTP equipment may need a wiring-standard-specific adapter.
TRRS tells you the plug has four conductor sections; size and contact count alone do not map the microphone. Evidence: C020A
CTIA and OMTP differ in the headset microphone and ground assignment. Evidence: C020A
A headset jack can differ from a plain headphone output or microphone input. Evidence: C020A
A vendor-documented CTIA/OMTP conversion is a wiring choice, not an ordinary size change. Evidence: C020A
Do not assume a four-contact plug will make the microphone work just because stereo audio is heard.
This is an original editorial decision study tied to existing source-checked claims. The following source inspections have not been renewed by this new page presentation, and none is independent engineering or model-by-model qualification.
Unresolved: Actual device fit, required physical tolerances, pinouts, negotiations, electrical safety and hardware interoperability still require the identified manufacturer's documentation and any necessary independent review.
Visual atlas / P020 / 2026
What to look for
Three insulating bands / four metal sections
Band counts are intentional; length, spacing and tip proportions are unmeasured.
Bands cannot tell you CTIA/OMTP, microphone support or analog/digital function.
No fabrication dimensions, conductor routing, guaranteed fit or device approval. For electrical, power and optical interfaces, follow the original equipment instructions.
Uses previously recorded V112 manufacturer claim/source inspections; October 2026 supplementary public-source spot checks are documented separately, not treated as a refreshed approval.
Original Port & Cable interpretive vector, no third-party photo, copied CAD, logo or vendor drawing. Third-party product photos, logos and source drawings are not redistributed. No independent technical or rights certification is claimed.
Original claim identifiers: C020A (private workspace). Legacy evidence dates and rights assessments remain as recorded.
The useful distinction
A matching diameter does not settle the headset arrangement or the socket’s job. A four-conductor component is not a microphone-input guarantee; Focusrite’s warning here applies specifically to the Scarlett Solo 4th Gen headphone output. C020C · C020D
| Check | Documented distinction | What this does not establish |
|---|---|---|
| Headset arrangement | The retained CTIA/OMTP claim distinguishes microphone and ground assignments. C020A | The original claim remains dated evidence; its FAQ answer was not retrievable in this recheck. |
| Jack construction | Switchcraft 35RASMT8CHNTRX is a switched, four-conductor TRRS jack. C020C | Four conductors do not establish a four-pad PCB layout or a particular headset scheme. |
| Named output | The Solo 4th Gen guide cautions about TS/TRRS headphones and adapters at its headphone output. C020D | Do not turn one device’s warning into a prohibition for every TRRS-capable device. |
Keep this limit: This component view does not establish microphone support, pin assignments or a suitable adapter for an unidentified port. C020C · C020D
CTIA and OMTP headset arrangements can assign microphone and ground differently within a 3.5 mm TRRS interface. [C020A]
Switchcraft identifies 35RASMT8CHNTRX as a four-conductor TRRS jack with tip/ring switching, horizontal mounting and surface-mount PC termination. [C020C]
Focusrite cautions that TS or TRRS headphones and adapters are unlikely to work properly with the Scarlett Solo 4th Gen headphone output and directs users to TRS headphones and adapters. [C020D]
Source check · 14 October 2026. Switchcraft construction and the Solo warning were visible. The StarTech FAQ returned navigation without its answer; C020A is not newly verified.
Source-qualified reference, not a wiring, optical-link or compatibility approval. Each linked claim and source carries its own recorded inspection date and review status. Selected source checks do not constitute independent technical or rights approval.
Existing source trail: S527 · S528 · S844.
Audio questions · 3.5 mm TRS connector · 6.35 mm TRS connector
Separate TRRS physical sections from headset wiring convention.
| Nominal contacts | 4S844 · 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 span | 4 (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 contacts | 4 (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. |
| Connector role | plug; 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. |
| Contact rows | 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. |
| Dimensions / axis | 3.5 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 |
| Coupling / latch | non-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. |
| Keying / polarization | Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations. |
| View convention | Longitudinal 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. |
| Contact gender / arrangement | Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations. |
| Mounting | surface-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. |
| Shell / form | Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations. |
| Manufacturer | Switchcraft (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. |
| Series | TRRS 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 / implementation | 35RASMT8CHNTRX (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. |
| Recorded markings | Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations. |
Keep this limit: Focusrite’s stated TRS-headphone requirement belongs to the specified Solo generation, not every headphone socket. S528
Read the exact device/headset CTIA/OMTP and audio-role specification before choosing an adapter.
Existing source inspection and AI review remain distinct from independent technical review. A matching form does not establish a safe connection.
Bounded facts, visible unknowns
| Conductive sections | 4: tip / two rings / sleeve [C020A] |
|---|---|
| Wiring assignment | Not identified visually [C020A] |
| Mechanical dimensions | No independently reviewed mechanical drawing in this release; do not use this page for fabrication. |
| Engineering pinout | Source-checked engineering profile available; independent review pending. Open engineering profile → |
| Verified device list | Not included. Check exact device and accessory documentation. |
This record is an identification starting point. It does not provide measured mating tolerances, electrical approval, or a list of verified device models. Use the original device and accessory documentation to resolve the remaining requirements.
Before you connect
Your next step
The source trail
AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.
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 ↗S844: full source recordInspect review dependencies → (private workspace)Switchcraft identifies 35RASMT8CHNTRX as a four-conductor TRRS jack with tip/ring switching, horizontal mounting and surface-mount PC termination.
Switchcraft · Switchcraft 35RASMT8CHNTRX switched TRRS jack ↗S527: full source recordInspect review dependencies → (private workspace)Focusrite cautions that TS or TRRS headphones and adapters are unlikely to work properly with the Scarlett Solo 4th Gen headphone output and directs users to TRS headphones and adapters.
Focusrite · Scarlett Solo 4th Gen: headphone and line-output roles ↗S528: full source recordInspect review dependencies → (private workspace)Follow the connection
Three contacts do not, by themselves, describe the signal assignment.
Open field note
Similar size does not mean the same signal.
Open field noteUse shape to narrow the candidates, then use documentation to establish function.
Open field noteCommon questions
Compare look-alikes: 3.5 mm TRS vs TRRS
Candidate selection does not confirm the identity or capabilities of your physical item.
SOURCE-QUALIFIED AUDIO REFERENCE
No source-observed physical view is selected for this row.
Inspected . C020C
Switchcraft 35RASMT8CHNTRX switched TRRS jack ↗
Configuration: four conductors, horizontal PC/surface mount, jack; Electrical: TRRS (Tip/Ring Switch).
Canonical source record S527 dated 2026-10-11. The V129 visit is recorded separately; inherited source dates are unchanged.
No hardware test, independent technical approval or rights clearance is asserted.
No source-observed physical view is selected for this row.
Inspected . C020D
Scarlett Solo 4th Gen: headphone and line-output roles ↗
Headphone Output and Speaker Outputs sections; page update 16-Jul-2026.
Canonical source record S528 dated 2026-10-11. The V129 visit is recorded separately; inherited source dates are unchanged.
No hardware test, independent technical approval or rights clearance is asserted.
Can I connect…
