ATX Power Supply

 

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

Image:atx20f.png

20 PIN MOLEX 39-29-9202 at the motherboard

Image:atx20m.png

20 PIN MOLEX 39-01-2200 at the cable

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

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

 

ATX v2.2 Power Supply

As specified in ATX Specification, from 2.2.

As specified in ATX12V Specification, from v2.0.

See ATX Power Supply for older 20 pin connector.

Pinout

Image:atx24f.png

24 PIN MOLEX 44206-0007 at the motherboard

Image:atx24m.png

24 PIN MOLEX 39-01-2240 at the cable

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

Wire Colours:

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 +12V1 Yellow +12 VDC
11 +12V1 Yellow +12 VDC
12 +3.3V Orange +3.3 VDC
13 +3.3V Orange +3.3 VDC
14 -12V Blue -12 VDC
15 COM Black Ground
16 /PS_ON Green Power Supply On (active low)
17 COM Black Ground
18 COM Black Ground
19 COM Black Ground
20 N/C Not connected
21 5V Red +5 VDC
22 5V Red +5 VDC
23 5V Red +5 VDC
24 COM Black Ground