An electrical device like this requires a reverse leakage current of 100nA @ 36V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 47V.
MMSZ5261B-TP Features
reverse leakage current of 100nA @ 36V 100nA @ 36V is the maximum voltage (Tol)
MMSZ5261B-TP Applications
There are a lot of Micro Commercial Co MMSZ5261B-TP applications of zener single diodes.