The reverse leakage current needed to power this electric device is 100nA @ 21V.As part of the operation, the maximum voltage - Zener (Nom) is reduced to 27V.
GDZ27B-HG3-08 Features
reverse leakage current of 100nA @ 21V 100nA @ 21V is the maximum voltage (Tol)
GDZ27B-HG3-08 Applications
There are a lot of Vishay Semiconductor Diodes Division GDZ27B-HG3-08 applications of zener single diodes.