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3 pin stereo plug connector layout
3 pin stereo plug connector
at the cable
used in various audio hardware, including computer audiocards

A TRS connector (tip, ring, sleeve) also called an audio jack, phone jack, phone plug, jack plug, stereo plug, mini-jack, mini-stereo, or headphone jack, is a common analog audio connector. It is cylindrical in shape, typically with three contacts, although sometimes with two (a TS connector) or four (a TRRS connector).

It was invented for use in telephone switchboards in the 20th century and is still widely used, both in its original ¼″ (exactly 6.35 mm) size and in miniaturized versions: 3.5 mm (approx. 1/8″) and 2.5 mm (approx. 3/32″). The connector's name is derived from the names of three conducting parts of the plug: Tip, Ring, and Sleeve.

TRS connector typical pinout for audio plug

Name Position Number Most common Colour
L (Left Signal) Tip 1 Green
R (Right Signal) Ring 2 Red
GND (Ground) Sleeve 3 Bare Copper

Some common uses of jack plugs and their matching sockets are:

 

Color codes of computer soundcard audio jacks

These codes were standardized by Microsoft and Intel in 1999 for computers as part of the PC99 standard. 

green TRS 3.5 mm stereo output, front channels or headphones
black TRS 3.5 mm stereo output, rear channels
grey TRS 3.5 mm stereo output, side channels
gold TRS 3.5 mm dual output, center and subwoofer
blue TRS 3.5 mm stereo input, line level
pink TRS 3.5 mm mono or stereo microphone input

 

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