An electrical device like this requires a reverse leakage current of 5μA @ 29.7V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 39V.
SMZJ3803BHE3_A/H Features
reverse leakage current of 5μA @ 29.7V 5μA @ 29.7V is the maximum voltage (Tol)
SMZJ3803BHE3_A/H Applications
There are a lot of Vishay Semiconductor Diodes Division SMZJ3803BHE3_A/H applications of zener single diodes.