Jack 3.5 / 6.3 mm - The Universal Audio Plug
From the studio (6.3 mm TS guitar) to the smartphone (3.5 mm TRRS) - the same family in two sizes and three contact configurations.
The jack connector (or phone connector) comes in three contact layouts: TS (Tip - Sleeve, mono), TRS (Tip - Ring - Sleeve, stereo or balanced mono) and TRRS (Tip - Ring - Ring - Sleeve, stereo + microphone). Two sizes dominate: 6.3 mm (1/4 inch) for instruments and pro audio, and 3.5 mm (1/8 inch) for portable devices, headphones and PC. Adapters between the two are passive and lossless. The 2.5 mm sub-mini version exists but is rare today.
Technical Specifications
| Sizes | 2.5 mm / 3.5 mm / 6.3 mm |
| Layouts | TS (mono), TRS (stereo), TRRS (+ mic) |
| Signal levels | Line-level, headphone-level |
| TRRS standard | CTIA (most modern phones) or OMTP (older) |
| Latch | None - friction |
| Typical use | Headphones, microphones, instruments |
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Frequently Asked Questions
CTIA vs OMTP - which TRRS standard?
CTIA (since ~2011) is the de-facto standard on modern smartphones, headphones and consoles. OMTP (older Nokia, some Sony) swaps mic and ground. CTIA-to-OMTP adapters exist for legacy gear.
Can I plug a 6.3 mm jack into a 3.5 mm socket?
Only with a sleeve adapter. Mechanical compatibility: a passive 6.3-to-3.5 adapter plug works without signal loss.
Is balanced jack possible?
Yes - TRS in balanced mode carries Tip = signal+, Ring = signal-, Sleeve = ground. Common in pro audio (Eurorack, mixers) for short runs without XLR.
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