Template:ATX power connector

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Revision as of 19:11, 2 June 2010 by 71.41.210.146 (talk) (Shrunk more detailed explanations, added wikilinks to give reader more details if desired.)
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24-pin ATX12V 2.x power supply connector
(20-pin omits the last four: 11, 12, 23 and 24)
Color Signal Pin Pin Signal Color
Orange +3.3 V 1 13 +3.3 V Orange
+3.3 V sense Brown
Orange +3.3 V 2 14 −12 V Blue
Black Ground 3 15 Ground Black
Red +5 V 4 16 Power on Green
Black Ground 5 17 Ground Black
Red +5 V 6 18 Ground Black
Black Ground 7 19 Ground Black
Grey Power good 8 20 No connection
Purple +5 V standby 9 21 +5 V Red
Yellow +12 V 10 22 +5 V Red
Yellow +12 V 11 23 +5 V Red
Orange +3.3 V 12 24 Ground Black
The three shaded pins (8, 13, and 16) are control signals, not power. "Power On" is pulled up to +5V by the PSU, and must be driven low to turn on the PSU. "Power good" is low when other outputs have not yet reached, or are about to leave, correct voltages. The "+3.3 V sense" line is for remote sensing.[1]
Pin 20 used to provide −5VDC (white wire) in ATX and ATX12V versions up to 1.2. It is optional in version 1.2, and missing in ver. 1.3 and up.
The right-hand pins are numbered 11 through 20 in the 20-pin version.
  1. "ATX Specification Version 2.1" (PDF).