An electrical device like this requires a reverse leakage current of 1μA @ 22V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 30V.For operation, diode reaches 1.2V @ 200mA at the maximum voltage - Forward (Vf).
BZD27C30P RFG Features
reverse leakage current of 1μA @ 22V 1μA @ 22V is the maximum voltage (Tol)
BZD27C30P RFG Applications
There are a lot of Taiwan Semiconductor Corporation BZD27C30P RFG applications of zener single diodes.