Pinouts >  ATX, WTX and other standard and proprietary power supply (PSU) cables connectors
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
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)

4 pin MiniFit Jr 5566-4 male connector layout
4 pin MiniFit Jr 5566-4 male connector
According to 25 reports in our database (21 positive and 4 negative) the ATX / BTX +12V power connector pinout should be correct.

Is this pinout
ATX / BTX +12V power connector visual pinout:click to enlarge
Source(s) of this and additional information: ATX Spec v2.03 at Platform Development Support
Copyright © 2000-2022 by team, except user uploaded images.
No portion of this webpage may be reproduced in any form without visible link to .
Efforts have been made to ensure this page is correct, but it is the responsibility of the user to verify the data is correct for their application.