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20 pin MiniFit Jr 5557-20 female (MOLEX 39-01-2200) connector layout
20 pin MiniFit Jr 5557-20 female (MOLEX 39-01-2200) connector
Same as standard ATX Except for PWR_OK and PS_ON
PinPin
Name
Description
11 +3.3V  
1 +3.3V +3.3V/RS in Deskpro EN
12 COM  
2 +5V  
13 COM  
3 +5V  
14 COM Aux COM in Deskpro EN
4 Fan OFF may be +3.3VSB in some server PSU
15 +5VSB  
5 +12V  
16 +3.3V  
6 -12V  
17 COM  
7 PS_ON  
18 COM  
8 COM RTN/RS in Deskpro EN
19 COM  
9 -5V  
20 +5V  
10 +5V  

A Compaq SP750 Server Power supply (Such as PS 7431-1) uses the same pinout as an ATX power supply, except that PS_ON is inverted, and PWR_OK is replaced with 3.3VSB. The wire colors are also different. To use this supply with a normal ATX motherboard, cut PWR_OK and tie the motherboard side of the wire to 5v. Leave the power supply side of the wire unconnected. Then use an inverter such as a 4096 or 7404 to fix the PS_ON signal. Tie the chip"s Vcc to 5VSB and GND to GND. Cut PS_ON, and hook the motherboard side to an inverter"s input, and the PSU side to the inverter"s output. Then tie all remaining pins to ground. An Inverted PS_ON signal is also common in G3 iMacs.

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