February 1, 2022

ITX WTX and ATX Power Supply Pinout and Connector Pinout for 20 and 24 pin Connector systems. Also the pinout for the 8 pin processor connector

12 volt input ATX dc to dc power supply for cars, busses, boats, and solar installations

Click here for 12 Volts DC Input ATX Power Supplies suitable for use in cars

Click here for 24 Volts DC Input ATX Power Supply

Click here for 48 volts DC input ATX Power Supply

Note that many of the ATX power supplies require a minimum draw on the 5V line to start to regulate. This is because the housekeeping circuitry power is pulled from an inductor that won't have power in it unless some power is being drawn.

Pin for 20 pin connector	Purpose	Wire Color	Alternate
1	+3.3Vdc	Orange
2	+3.3Vdc	Orange
3	GND	Black
4	+5Vdc	Red
5	GND	Black
6	+5Vdc	Red
7	GND	Black
8	PWR-OK	Gray
9	+5Vdc VSB standby Voltage	Purple
10	+12Vdc	Yellow
11	+3.3Vdc	Orange	Brown may represent 3.3Vdc sense
12	-12Vdc	Blue
13	GND	Black
14	PS-ON	Green	Shorting this to ground turns on the supply
15	GND	Black
16	GND	Black
17	GND	Black
18	-5Vdc	White
19	+5Vdc	Red
20	+5Vdc	Red

For 24 pin systems use the following table:

Pin for 24 pin connector	Purpose	Wire Color	Alternate
1	+3.3Vdc	Orange
2	+3.3Vdc	Orange
3	GND	Black
4	+5Vdc	Red
5	GND	Black
6	+5Vdc	Red
7	GND	Black
8	PWR-OK	Gray	A signal from the Power Supply saying that the output voltages are within range
9	+5Vdc VSB standby Voltage	Purple
10	+12Vdc	Yellow
11	+12Vdc	Yellow
12	+3.3Vdc	Orange
13	+3.3Vdc	Orange
14	-12Vdc	Blue
15	GND	Black
16	PS-ON	Green	Shorting this to ground turns on the supply
17	GND	Black
18	GND	Black
19	GND	Black
20	-5Vdc	White
21	+5Vdc	Red
22	+5Vdc	Red
23	+5Vdc	Red
24	GND	Black

PCIe 8-pin	Purpose	Color	Notes
1	+12V digital	white
2	+12V digital	white
3	+12V digital	white
4	sense wire		senses the voltage at the connector for feedback to the power supply
5	0 V	black	ground
6	0 V	black	ground
7	0 V	black	ground
8	sense ground		return for the voltage sense return

PCIe 6-pin	Purpose	Color
1	+12V	Yellow
2	+12V	Yellow
3	+12V	Yellow
4	Sense	Usually black
5	Ground	Black
6	Ground	Black

4-Pin P4	Purpose	Color
1	Ground	Black
2	Ground	Black
3	+12V	Yellow
4	+12V	Yellow

EPS-12V	Purpose	Color
1	Ground	Black
2	Ground	Black
3	Ground	Black
4	Ground	Black
5	+12V	Yellow
6	+12V	Yellow
7	+12V	Yellow
8	+12V	Yellow

Note: To turn on the power supply Pin 14 must be attached to GND (Pins 13, 15, 16, or 17).
Note: Many of these converters need a minimum current draw on at least one of the power pins to operate in regulation.

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Saturday, 05-Oct-2024 18:58:16 EDT

Pinout for ITX, ATX computer power supplies

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