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

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Discussion Overview

The discussion revolves around the use of ATX power connectors from personal computers for powering devices, focusing on the different connector footprints such as 20-pin, 24-pin, and 4-pin configurations. Participants explore the specifications and practical considerations for utilizing these connectors in various applications.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant seeks clarification on how to determine the appropriate footprint for ATX power connectors.
  • Another suggests referring to the PC98 specifications for connector dimensions.
  • Concerns are raised about the minimum output current requirements of PC power supplies, indicating that they may not function effectively as lab bench supplies without proper load management.
  • A participant shares an anecdote about connecting the PS_ON# pin to ground to activate the power supply but notes uncertainty regarding the output voltage and the lack of detailed specifications from manufacturers.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the specifications and practical use of ATX power connectors, with no consensus on the best approach to utilize them in lab settings.

Contextual Notes

Limitations include potential missing assumptions about the load requirements and the specific models of power supplies being discussed, as well as the lack of detailed manufacturer specifications.

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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