If we see the GPIO header of Raspberry Pi 3 Model B, there are supply voltages of 5V and 3.3V. This leads to a confusion, if the GPIO pins are actually 5V tolerant or maximum voltage is 3.3V only?
The Raspberry Pi GPIO pin is not 5V tolerant and any voltage between 1.8V and 3.3V is treated as HIGH on the pin. Any voltage lower than 1.8V on the pin is treated as LOW. Below is the snapshot from the Raspberry Pi 3 Model B schematic. We can see that the VDDIO voltage of the Broadcom chip BCM2837 is 3.3V. If designer wants to give 5V signal input on the GPIO header, level translator has to be used from 5V to 3.3V
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