The reverse leakage current for this electrical device should be 5μA @ 42.6V.5% indicates the maximum possible voltage (Tol) of 5%.While operating, the maximum voltage - Zener (Nom) is reduced to 56VV.This device should be operated at 4.5mA on the working test voltage.
SML4758AHE3/5A Features
reverse leakage current of 5μA @ 42.6V 5μA @ 42.6V is the maximum voltage (Tol) the working test voltage to 4.5mA minimal dynamic impedance is 4.5mA
SML4758AHE3/5A Applications
There are a lot of Vishay Semiconductor Diodes Division SML4758AHE3/5A applications of zener single diodes.