An electrical device like this requires a reverse leakage current of 50nA @ 15V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 20V.For operation, diode reaches 1.1V @ 100mA at the maximum voltage - Forward (Vf).
PDZ20BGWJ Features
reverse leakage current of 50nA @ 15V 50nA @ 15V is the maximum voltage (Tol)
PDZ20BGWJ Applications
There are a lot of Nexperia USA Inc. PDZ20BGWJ applications of zener single diodes.