An electrical device like this requires a reverse leakage current of 1μA @ 33V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 43V.For operation, diode reaches 1.2V @ 200mA at the maximum voltage - Forward (Vf).
BZD17C43P RTG Features
reverse leakage current of 1μA @ 33V 1μA @ 33V is the maximum voltage (Tol)
BZD17C43P RTG Applications
There are a lot of Taiwan Semiconductor Corporation BZD17C43P RTG applications of zener single diodes.