Beginners • Re: questions on the voltage of the 5V GPIO pin

I have 2 questions on the voltage of the 5V GPIO pin.

There are no 5 volt GPIO pins on the 2x20-way header of a 'flagship' RPi board.


GPIO pins work at 0 volts and 3.3 volts, and must not be subjected to an applied voltage outside that range. Not all physical pins on the 2x20-way header are GPIO pins. There are also fixed 3.3v and 5v pins, and ground connections, leaving 26 actual GPIO pins.

Physical pins #2 and #4 on the header carry a fixed 5 volt level. They are not connected to the GPIO circuitry on the RPi processor and cannot be software controlled.

Statistics: Posted by B.Goode — Thu Nov 27, 2025 10:16 am

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