An electrical device like this requires a reverse leakage current of 45nA @ 33V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 47V.For operation, diode reaches 1V @ 10mA at the maximum voltage - Forward (Vf).
BZT52B47 RHG Features
reverse leakage current of 45nA @ 33V 45nA @ 33V is the maximum voltage (Tol)
BZT52B47 RHG Applications
There are a lot of Taiwan Semiconductor Corporation BZT52B47 RHG applications of zener single diodes.