An electrical device like this requires a reverse leakage current of 3μA @ 1.5V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 4.7V.For operation, diode reaches 1.2V @ 200mA at the maximum voltage - Forward (Vf).
1N5992B_T50R Features
reverse leakage current of 3μA @ 1.5V 3μA @ 1.5V is the maximum voltage (Tol)
1N5992B_T50R Applications
There are a lot of ON Semiconductor 1N5992B_T50R applications of zener single diodes.