Why a Raspberry Pi shouldn't be powered through its GPIO pins

Powering a Raspberry Pi through its GPIO 5V pin bypasses the protective circuitry on the board's dedicated power input. The Raspberry Pi 1 schematic reveals four key protection stages on the USB power path: a fuse (overcurrent protection), a transient voltage suppressor (spike protection), and filter capacitors (noise/ripple smoothing and current buffering). Skipping these by injecting power directly into the GPIO rail means a faulty or noisy power supply could damage chips directly rather than just blowing a replaceable fuse. The practice is only safe if equivalent protective circuitry is present in the external power circuit feeding the GPIO pins.

Source: https://82mhz.net/posts/2026/08/why-a-raspberry-pi-shouldn-t-be-powered-through-it-s-gpio-pins. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.