ATX Power Supply
From HwB
As specified in ATX Specification, upto v2.1.
As specified in ATX12V Specification, upto v1.3.
See ATX v2.2 Power Supply for newer 24 pin connector.
Pinout
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.