The reverse leakage current needed to power this electric device is 500nA @ 4V.As part of the operation, the maximum voltage - Zener (Nom) is reduced to 7.5V.
GDZ7V5B-HG3-18 Features
reverse leakage current of 500nA @ 4V 500nA @ 4V is the maximum voltage (Tol)
GDZ7V5B-HG3-18 Applications
There are a lot of Vishay Semiconductor Diodes Division GDZ7V5B-HG3-18 applications of zener single diodes.