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ATX 24 pin 12V Power Supply Pinout

Pinout for the Standard ATX 24 pin 12V Motherboard Power Connector

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24 Pin Motherboard Power Connector - Molex 39-01-2240 - Molex Mini-fit Jr

24 Pin Motherboard Power Connector

© Tim Fisher

The ATX 24 pin power supply connector is the standard motherboard power connector in computers today.

The connector itself is a Molex 39-01-2240 connector, often called a Molex Mini-fit Jr.

Note: The original ATX standard supported a 20 pin connector with a very similar pinout as the 24 pin connector but with pins 11, 12, 23, and 24 omitted.

Below is the complete pinout table for the standard ATX 24 pin 12V power supply connector as of Version 2.2 of the ATX Specification (PDF).

Note: If you're using this pinout table to test power supply voltages, be aware that the voltages must be within ATX specified tolerances.

You can see other ATX power supply connector pinouts in my ATX Power Supply Pinout Tables list.

ATX 24 pin 12V Power Connector Pinout (ATX v2.2)

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_ON Gray Power Good
9 +5VSB Purple +5 VDC Standby
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
17 COM Black Ground
18 COM Black Ground
19 COM Black Ground
20 NC White -5 VDC (Optional - Removed in ATX12V v2.01)
21 +5V Red +5 VDC
22 +5V Red +5 VDC
23 +5V Red +5 VDC
24 COM Black Ground

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