The reverse leakage current needed to power this electric device is 100nA @ 43V.As part of the operation, the maximum voltage - Zener (Nom) is reduced to 56V.
MMSZ5263B-TP Features
reverse leakage current of 100nA @ 43V 100nA @ 43V is the maximum voltage (Tol)
MMSZ5263B-TP Applications
There are a lot of Micro Commercial Co MMSZ5263B-TP applications of zener single diodes.