Intel ATX Power Supply Design Guide

Version 0.9

Pin 1 +3.3VDC

+3.3VDC Pin 11 Pin 1

COM

Pin 1

+12VDC

+3.3VDC

-12VDC

COM

 

COM

COM

 

 

 

 

 

COM

COM

+3.3VDC

 

COM

+5VDC

PS_ON#

+3.3VDC

Pin 4

+5VDC

 

 

Pin 6

+5VDC

COM

 

 

COM

 

 

 

+5VDC

 

 

COM

Aux Power Connector

 

Peripheral Power

 

 

 

COM

 

 

COM

(250 W & 300 W Systems)

 

Connector

 

 

 

 

 

 

 

 

PWR_OK

 

 

-5VDC

 

Pin 1

+5VDC

 

 

 

+5VSB

 

 

+5VDC

 

 

COM

 

 

 

 

COM

 

 

 

 

 

 

+12VDC

 

 

+5VDC

 

Pin 4

+12VDC

ATX Main Power Connector

 

Floppy Drive

 

Power Connector

 

 

 

 

 

 

 

Figure 4: ATX Power Supply Connectors

(Pin-side view, not to scale)

Listed or recognized component appliance wiring material (AVLV2), CN, rated min 85 °C, 300 VDC shall be used for all output wiring. There are no specific requirements for length or color of wiring from the power supply. The following sections suggest wire color coding that is followed by many vendors, but this color coding is NOT required.

4.5.1 ATX Main Power Connector

Connector: MOLEX 39-01-2200 or equivalent

(Mating motherboard connector is Molex 39-29-9202 or equivalent)

18 AWG is suggested for all wires except for the +3.3 V supply and sense return wires combined into pin 11 (22 AWG).

For 300 W configurations, 16 AWG is recommended for all +5VDC, +3.3VDC, and COM.

Pin

Signal

Color

Pin

Signal

Color

 

 

 

 

 

 

1

+3.3VDC

Orange

11

+3.3VDC

Orange

 

 

 

[11]

[+3.3 V default

[Brown]

 

 

 

 

sense]

 

2

+3.3VDC

Orange

12

-12VDC

Blue

3

COM

Black

13

COM

Black

4

+5VDC

Red

14

PS_ON#

Green

5

COM

Black

15

COM

Black

6

+5VDC

Red

16

COM

Black

7

COM

Black

17

COM

Black

8

PWR_OK

Gray

18

-5VDC

White

9

+5VSB

Purple

19

+5VDC

Red

10

+12VDC

Yellow

20

+5VDC

Red

 

 

 

 

 

 

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