4 pin MiniFit Jr 5557-4 (molex 39-29-9042) female connector layout
4 pin MiniFit Jr 5557-4 (molex 39-29-9042) female connector
at the motherboard
4 pin MiniFit Jr 5566-4 male connector layout
4 pin MiniFit Jr 5566-4 male connector
at the cable
used on modern ATX / BTX motherboards


Pin Name   Color Description
1 COM   Black Ground
2 COM   Black Ground
3 +12VDC   Yellow +12 VDC
4 +12VDC   Yellow +12 VDC

Recommended wiresize 20 AWG


Replacement names for the
* motherboard part: MF-2x2 , MF-2x2 MRB
* cable mating part: MF-2x2 F. (mini-fit series)

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Pinouts.ru > ATX, WTX and other standard and proprietary power supply (PSU) cables connectors > Pinout of ATX / BTX +12V power connector and layout of 4 pin MOLEX 39-29-9042 connector and 4 pin MOLEX 39-01-2040 connector
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