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ATX power supply connector pinout

connector or cable wiring scheme

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v 1.x with 20 pin connector was widely used at PC motherboard. Replaced by v 2.x with 24 pin connector



ATX specification includes not only Power Supply Unit, but also case and motherboard. In addition to old AT standard, one extra voltage line is available(+3.3V), connector changed to a single 20-pin and power supply uses a power-on wire, allowing PSU to be turned off by software.

Pin Name Color Description
13.3V Orange+3.3 VDC
23.3V Orange+3.3 VDC
3COM BlackGround
45V Red+5 VDC
5COM BlackGround
65V Red+5 VDC
7COM BlackGround
8PWR_OK GrayPower Ok (is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation)
95VSB Purple+5 VDC Standby Voltage (max 10mA)
1012V Yellow+12 VDC
113.3V Orange+3.3 VDC
12-12V Blue-12 VDC
13COM BlackGround
14/PS_ON GreenPower Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.
15COM BlackGround
16COM BlackGround
17COM BlackGround
18-5V White-5 VDC
195V Red+5 VDC
205V Red+5 VDC
/PSON activated by pressing and releasing the power button while the power supply is in standby mode. Activating /PSON connects the power supply�s /PSON input to ground, thereby switching the power supply to full-on condition.

18 AWG is recommended for all wires except pin 11, which should be 22 AWG. For 300W configurations 16 AWG is recommended.
There are several ATX variants.

Related Links:
Pinouts.ru > ATX, BTX, WTX and other power supply cables connectors pinouts listing >  Pinout of ATX power supply connector and layout of 20 pin MOLEX 39-29-9202 connector and 20 pin MOLEX 39-01-2200 connector
Document status: correct
Source(s) of this and additional information: ATX Spec v2.03 at Platform Development Support, from Hardware Book 22 reports
Last updated at Fri Sep 15 2006. Submit additions or corrections for this document. Is this document correct or incorrect? What is your opinion?
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