Pinouts of Connectors

ATX motherboard Power Supply connector pinout

layout
schematic diagram
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20 pin MOLEX 39-29-9202 connector pin-out & layout
20 pin MOLEX 39-29-9202 connector  at the motherboard
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

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20 pin MOLEX 39-01-2200 connector pin-outs & layouts
20 pin MOLEX 39-01-2200 connector  at the cable
Pinouts.ru > Pinouts of power supplyes >  Pinout of ATX motherboard Power Supply connector and layout of 20 pin MOLEX 39-29-9202 connector and 20 pin MOLEX 39-01-2200 connector

Source(s): ATX Spec v2.03 at Platform Development Support, from Hardware Book
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