An electrical device like this requires a reverse leakage current of 1μA @ 91.2V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 120V.
1SMB5951HR5G Features
reverse leakage current of 1μA @ 91.2V 1μA @ 91.2V is the maximum voltage (Tol)
1SMB5951HR5G Applications
There are a lot of Taiwan Semiconductor Corporation 1SMB5951HR5G applications of zener single diodes.