ZENER DIODE CATHODE TO CASE (KK)

Zener diodes are a specific type of semiconductor diode that allows current to flow in the opposite direction rather than just in a single direction when exposed to enough voltage. Typically, diodes are only able to flow from anode to cathode. Zener diodes are notorious for maintaining a consistent reverse-voltage capability, and typically regulate voltage in circuits because they are so reliable. Zener diode cathode is referring to the negative side of the circuit.