Intel ATX12VO Desktop Power Supply Design Guide

ATX12VO 10-Pin 12 V-Only Motherboard Power Pinout

The ATX12VO connector replaces the 24-pin ATX plug on 12 V-only systems, where the motherboard makes its own 5 V and 3.3 V. Select a contact to see its role.

Before you wire

  • Not interchangeable with a classic 24-pin ATX supply: ATX12VO has no 3.3 V or 5 V rails, and its standby rail is 12 V instead of 5 V.

Pin assignment

Pin 10: +12V10Pin 9: +12V9Pin 8: +12V8Pin 7: +12VSB7Pin 6: PWR_OK6Pin 5: I_PSU%5Pin 4: GND4Pin 3: GND3Pin 2: GND2Pin 1: PS_ON#1Pin 10: +12V10Pin 9: +12V9Pin 8: +12V8Pin 7: +12VSB7Pin 6: PWR_OK6Pin 5: I_PSU%5Pin 4: GND4Pin 3: GND3Pin 2: GND2Pin 1: PS_ON#1
  • Control
  • Ground
  • Power

Schematic face view, not to scale · numbering per Intel ATX12VO Desktop Power Supply Design Guide

Pin assignment of ATX12VO 10-Pin Main Power Connector
PinSignalFunctionStatus
PS_ON#Power supply on, active low: the motherboard pulls it to ground to start the main +12 V outputStandard
GNDGround returnStandard
GNDGround returnStandard
GNDGround returnStandard
I_PSU%Power supply load signal: reports the +12 V power being delivered as a percentage of the supply's rated outputStandard
PWR_OKPower good: goes high when the +12 V output is within regulationStandard
+12VSB+12 V standby: stays on while the PC is off (replaces the +5 VSB of classic ATX)Standard
+12V+12 VDC main powerStandard
+12V+12 VDC main powerStandard
+12V+12 VDC main power; also carries the optional 12 V remote-sense wireStandard

Pin details

Select a pin on the diagram or table for full details.

Pin details

About this connector

Ten-contact 12 V-only motherboard power connector with three +12 V contacts, +12 V standby, power control and status signals, and ground returns.

Notes

  • The contact map shows the motherboard header, as in Intel Figure 5-2: the latch is above pins 10 to 6. The cable plug uses the same pin numbers.
  • Intel rates it at 216 to 288 W, assuming 6 to 8 A per contact. Boards that need more use an optional extra board power connector.

Common use cases

  • OEM and small-form-factor desktops designed for low idle power

Specifications

Standard
4.2 mm pitch 2x5 power header
Positions
10

Primary sources

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