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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 | COM |
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COM |
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COM | COM | +3.3VDC |
| COM |
+5VDC | PS_ON# | +3.3VDC | Pin 4 | +5VDC |
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| Pin 6 | +5VDC | ||
COM |
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COM |
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+5VDC |
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| COM | Aux Power Connector |
| Peripheral Power |
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COM |
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| COM | (250 W & 300 W Systems) |
| Connector |
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PWR_OK |
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+5VSB |
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| COM |
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| COM | ||
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+12VDC |
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| Pin 4 | +12VDC |
ATX Main Power Connector |
| Floppy Drive | ||||
| Power Connector | |||||
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Figure 4: ATX Power Supply Connectors
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
(Mating motherboard connector is Molex
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 |
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1 | +3.3VDC | Orange | 11 | +3.3VDC | Orange |
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| [11] | [+3.3 V default | [Brown] |
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2 | +3.3VDC | Orange | 12 | 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 | White | |
9 | +5VSB | Purple | 19 | +5VDC | Red |
10 | +12VDC | Yellow | 20 | +5VDC | Red |
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