Royce Posté sur March 5, 2021
This is not called a voltage regulator tube, this is a TVS tube. It is an ESD device and is used to protect this pin. When your hand touches the button, it may release static electricity and damage the pin of the chip.
Cannon Posté sur March 5, 2021
The esd protection of the interface.
Milly Posté sur March 5, 2021
This is ESD, usually used at the interface to prevent static electricity.
