ATX Power Connector Footprint: 20, 24, 4 Pins | Guide

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SUMMARY

The discussion focuses on the use of ATX power connectors, specifically the 20-pin, 24-pin, and 4-pin configurations, for powering devices. Users are advised to refer to PC98 specifications for connector dimensions and to check the datasheets of power supplies for minimum output current requirements. It is crucial to ballast the outputs to meet these minimums when using ATX power supplies as lab bench supplies. Additionally, connecting the PS_ON# pin to ground can activate the power supply, but voltage testing is necessary to ensure proper functionality.

PREREQUISITES
  • Understanding of ATX power supply specifications
  • Familiarity with PC98 connector dimensions
  • Knowledge of minimum output current requirements for power supplies
  • Basic electronics skills for testing voltage and load management
NEXT STEPS
  • Research ATX power connector pinouts and specifications
  • Learn how to read and interpret power supply datasheets
  • Explore methods for safely ballasting power supply outputs
  • Investigate the implications of connecting PS_ON# to ground
USEFUL FOR

Electronics hobbyists, engineers designing custom power solutions, and anyone interested in repurposing ATX power supplies for experimental setups.

fidel
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I want to use atx power from my pc as the source for my devices. How can i decide the footprint of the connectors, e.g. those with 20pins, 24pins, 4pins, ... Maybe i can goooogle them out using their formal names, but, :confused: what are they?
 
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get the dimensions from the pc98 specs.
 
Also, keep in mind that PC power supplies generally have a minimum output current on one or more rails in order to stay in regulation. You generally won't be able to use them as a lab bench supply, unless you are careful to ballast up the outputs to their minimum output current when there is no other load. Just check the datasheet for the power supply you are considering, and look for the "minimum output load current" specification.
 
Thank you. I've got the definition :)

Concerning the minimum output current required, I once connected PS_ON# to ground as the connector was floating, and the fan did run. But I didn't test the output voltage, so I don't know if the power was working properly then. And it seems the manufacturers haven't provided detailed specification. What a pity if they can't be utilized in lab:(
 

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