Recently i was looking for a guide which pins on the BIGTREETECH EBB36* can be used for 5V applications. After a bit of digging, i came across this forum entry  where it was described that the following pins are 5V tolerant:

  • EBB36/42 v1.0 uses STM32F072C8T6
    • All Pins but PA0-7, PB0-1, PC0-5, PC13-15 are 5V tolerant
  • EBB36/42 v1.1 and v1.2 use STM32G0B1CBT6
    • All Pins but PA4 and PA5 are 5V tolerant

As usual, crosscheck these values, I’m not responsible for any damage resulting out of this article.