Template:ATX power connector

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24-pin ATX12V 2.x power supply connector
Color Signal[A] Pin[B] Pin[B][C] Signal[A] Color
Orange +3.3 V 1 13 +3.3 V Orange
+3.3 V sense[D] Brown
Orange +3.3 V 2 14 −12 V Blue
Black Ground 3 15 Ground Black
Red +5 V 4 16 Power on[E] Green
Black Ground 5 17 Ground Black
Red +5 V 6 18 Ground Black
Black Ground 7 19 Ground Black
Grey Power good[F] 8 20 Reserved[G] None
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
  1. ^ a b   Light-blue background denotes control signals.
  2. ^ a b   Light-green background denotes the pins present only in the 24-pin connector.
  3. ^ In the 20-pin connector, pins 13–22 are numbered 11–20 respectively.
  4. ^ Supplies +3.3 V power and also has a second low-current wire for remote sensing.[1]
  5. ^ A control signal that is pulled up to +5 V by the PSU and must be driven low to turn on the PSU.
  6. ^ A control signal that is low when other outputs have not yet reached, or are about to leave, correct voltages.
  7. ^ Formerly −5 V (  white wire), absent in modern power supplies; it was optional in ATX and ATX12V v1.2 and deleted since v1.3.
  1. ^ "ATX Specification Version 2.1" (PDF). Archived from the original (PDF) on 2003-09-24.
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