An electrical device such as this requires reverse leakage current of 100nA @ 8V.During operation, the maximum voltage - Zener (Nom) is reduced to 12V volts.As soon as the maximum voltage - Forward (Vf) is supplied, it reaches 1.5V @ 100mA V.
BZX79C12_T50R Features
reverse leakage current of 100nA @ 8V 100nA @ 8V is the maximum voltage (Tol)
BZX79C12_T50R Applications
There are a lot of ON Semiconductor BZX79C12_T50R applications of zener single diodes.