An electrical device like this requires a reverse leakage current of 500nA @ 5V.During reverse leakage, the maximum current reaches 500nA.For full functionality, this device should have a reverse voltage peak of 500mA.
UDZSTE-178.2B Features
reverse leakage current of 500nA @ 5V 500nA @ 5V is the maximum voltage (Tol) Reverse leakage current reaches 500nA
UDZSTE-178.2B Applications
There are a lot of ROHM Semiconductor UDZSTE-178.2B applications of zener single diodes.