Power Supply Connectors

Connectors Index:

* ATX Power Supply Connector

[ ↑ Interfacing index]

ATX Power Supply Connector

20 Pin, MOLEX, 4.2mm pitch
Part No. 39-29-9202, male, PCB mounting
Part No. 39-01-2200, female, cable mounting.

ATX Power Supply Connector

Pin	Color	Signal		Signal	Pin	Color
11	Orange	3.3V		3.3V	1	Orange
12	Blue	-12V		3.3V	2	Orange
13	Black	Common		Common	3	Black
14*	Green	PS-On		5V	4	Red
15	Black	Common		Common	5	Black
16	Black	Common		5V	6	Red
17	Black	Common		Common	7	Black
18	White	-5V		Pw-OK	8	Grey
19	Red	5V		5V Standby	9	Purple
20	Red	5V		+12V	10	Yellow

* Pin 14 has an internal pull-up to +5V.
When pin 14 is grounded the power unit will come out of standby and into full operation.

Maximum supply currents for 250W ATX PSU , with power at Imax.
Sig.Name	Current	Power
+3.3V	14A	46.2W
+5V	25A	125W
+12V	10A	120W
-5V	0.5A	2.5W
-12V	0.8A	9.6W

Load limits
Sig.Name	Limit
+5V and +3.3V combined	125W
-5V and -12V combined	10W

Suggested loads for testing
Sig.Name	Current/ amps	Power/ watts	Resistance/ ohms
+3.3V	10	33	0.33
+5V	15.2	76	0.33
+12V	8	96	1.5
-5V	0.5A	2.5	10
-12	0.55	6.5	22

Total test load = 214W
Sig.Name	Actual power
+5V and +3.3V combined	109W
-5V and -12V combined	9W

[↑ Power Supply Connectors Index]

Originally by:R.Clarke@surrey.ac.uk
Last modified: 2002 May ^8th.
from: http://www.ee.surrey.ac.uk/Workshop/advice/conns/connPSU.html
beautified by Dennis German