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If I understand it correctly: the two 5v pins are inner connected, so what's the purpose to design two 5v pins, please share a scenario that requires to use both 5v pins, thanks

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    Same reason it has 5 Gnd pins
    – Milliways
    Commented May 20, 2023 at 6:57
  • 1
    @Milliways 8 ground pins actually :) and multiple 3V3 of course
    – Dirk
    Commented May 20, 2023 at 8:04
  • There is many power supply to plug many things. However, as the power supply is giving 5.1V 3.0A DC output, if you plug many 3/5V, as the power remains the same, the current drops so if you need a certain power, you will need an extra power supply that your Raspberry cannot give.
    – JoelCrypto
    Commented May 20, 2023 at 10:04
  • why would there be a scenario that requires the use of both 5 V pins?
    – jsotola
    Commented May 20, 2023 at 15:41

1 Answer 1

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It is commonplace to use external modules with the RPi, such as GPS receivers, real time clocks, fans, modems, and many other types of devices.

Many/most of these are designed to be powered from 5V DC. Having a couple of 5V pins means that you may use the RPi to supply that power to the module(s).

Additionally, some other modules may run on 3.3V so there are also two 3.3V pins on the RPi header for that purpose.

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