3.5mm Audio Jack (TRS / TRRS) Pinout
The headphone/headset jack — 3-conductor TRS (stereo) and 4-conductor TRRS (with mic).
Overview
A 3.5mm audio jack has either 3 conductors (TRS = Tip, Ring, Sleeve) for stereo audio, or 4 (TRRS) to add a microphone for headsets. The contacts are named from the tip inward.
TRS is simple: Tip = left, Ring = right, Sleeve = ground. TRRS has two common (incompatible) wiring orders: CTIA (most phones — Sleeve = mic, Ring2 = ground) and OMTP (older — swapped). The pinout below is the common CTIA order.
Pinout
| Pin | Name | Function | Description |
|---|---|---|---|
| T | Tip — Left | AUDIO | Left channel audio. |
| R1 | Ring 1 — Right | AUDIO | Right channel audio. |
| R2 | Ring 2 — GND | GND | Audio ground (CTIA). |
| S | Sleeve — Mic | AUDIO | Microphone (CTIA); ground on a TRS plug. |
Notes
- TRS (stereo, no mic): Tip = L, Ring = R, Sleeve = GND.
- TRRS CTIA (phones): …Ring2 = GND, Sleeve = Mic. OMTP swaps these two.
Reference: Phone connector (audio) pinout· verified 2026-06-21