PS-ON Signal

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#PS_ON pin is marked by number 16.

PS-ON Signal is a pin on a 20-pin or 24-pin ATX-specified power connector used to turn a personal computer power supply unit on/off. The PS_ON pin is normally pulled high in an open-circuit, but will turn on the power supply when it is pulled low, by shorting it to the common signal (COM). Conversely the power supply is turned off when the PS-ON is in open-circuit. [1][2]

The PS_ON pin can be jumpered to manually turn a PSU on.[3]


  1. ^ "SG6516 PC Power Supply Supervisors" (PDF). Fairchild Semiconductor. Archived from the original (PDF) on 2018-08-21. Retrieved August 21, 2018.
  2. ^ "Desktop Platform Form Factors Power Supply Design Guide" (PDF). Intel Corporation. Retrieved August 21, 2018.
  3. ^ "How to Jump a PSU |". Retrieved 2023-12-11.