An electrical device like this requires a reverse leakage current of 100nA @ 22V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 30V.For operation, diode reaches 1.5V @ 10mA at the maximum voltage - Forward (Vf).
BZS55C30 RXG Features
reverse leakage current of 100nA @ 22V 100nA @ 22V is the maximum voltage (Tol)
BZS55C30 RXG Applications
There are a lot of Taiwan Semiconductor Corporation BZS55C30 RXG applications of zener single diodes.