An electrical device such as this requires reverse leakage current of 5μA @ 16.7V.During operation, the maximum voltage - Zener (Nom) is reduced to 22V volts.
1N969B_T50A Features
reverse leakage current of 5μA @ 16.7V 5μA @ 16.7V is the maximum voltage (Tol)
1N969B_T50A Applications
There are a lot of ON Semiconductor 1N969B_T50A applications of zener single diodes.