An electrical device like this requires a reverse leakage current of 1μA @ 120V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 162V.For operation, diode reaches 1.2V @ 200mA at the maximum voltage - Forward (Vf).
BZD27C160P RTG Features
reverse leakage current of 1μA @ 120V 1μA @ 120V is the maximum voltage (Tol)
BZD27C160P RTG Applications
There are a lot of Taiwan Semiconductor Corporation BZD27C160P RTG applications of zener single diodes.