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

Atx20f.png

20 PIN MOLEX 39-29-9202 at the motherboard

Atx20m.png

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.

Contributions

Sources

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