An electrical device like this requires a reverse leakage current of 100nA @ 14V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 18V.For operation, diode reaches 1.1V @ 200mA at the maximum voltage - Forward (Vf).
1N5248B-T Features
reverse leakage current of 100nA @ 14V 100nA @ 14V is the maximum voltage (Tol)
1N5248B-T Applications
There are a lot of Vishay Semiconductor Diodes Division 1N5248B-T applications of zener single diodes.