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ATX Power Supply

20 PIN MOLEX 39-29-9202 (at the motherboard)
20 PIN MOLEX 39-01-2200 (at the cable)

20 PIN MOLEX 39-29-9202 at the motherboard
20 PIN MOLEX 39-01-2200 at the cable

Pin Name   Color Description
1 3.3V   Orange +3.3 VDC
2 3.3V   Orange +3.3 VDC
3 COM   Black Ground
4 5V   Red +5 VDC
5 COM   Black Ground
6 5V   Red +5 VDC
7 COM   Black Ground
8 PWR_OK   Gray Power Ok (+5V & +3.3V is ok)
9 5VSB   Purple +5 VDC Standby Voltage (max 10mA)
10 12V   Yellow +12 VDC
11 3.3V   Orange +3.3 VDC
12 -12V   Blue -12 VDC
13 COM   Black Ground
14 /PS_ON   Green Power Supply On (active low)
15 COM   Black Ground
16 COM   Black Ground
17 COM   Black Ground
18 -5V   White -5 VDC
19 5V   Red +5 VDC
20 5V   Red +5 VDC

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

Contributor: Joakim Ögren
Source: ATX Spec v2.03 at Platform Development Support

Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-13