ATX12V Power Supply Design Guide
Version 2.0
34
4.5.1. ATX Main Power Connector
Connector: MOLEX* housing: 24 Pin Molex Mini-Fit Jr. PN# 39-01-2240 or
equivalent
(Mating motherboard connector is Molex 44206-0007 or equivalent)
18 AWG is suggested for all wires except for the +3.3 V sense return wire, pin 11 (22 AWG).
For 300 W configurations, 16 AWG is recommended for all +12 VDC, +5 VDC, +3.3 VDC, and
COM.
Pin Signal Color Pin Signal Color
1 +3.3VDC
Orange
13
[13]
+3.3VDC
[+3.3 V default
sense]
Orange
[Brown]
2 +3.3VDC Orange 14 -12VDC Blue
3 COM Black 15 COM Black
4 +5VDC Red 16 PS_ON# Green
5 COM Black 17 COM Black
6 +5VDC Red 18 COM Black
7 COM Black 19 COM Black
8 PWR_OK Gray 20 Reserved N/C
9 +5VSB Purple 21 +5VDC Red
10 +12 V1DC Yellow 22 +5VDC Red
11 +12 V1DC Yellow 23 +5 VDC Red
12 +3.3 VDC Orange 24 COM Black
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