The reverse leakage current for this electrical device should be 200nA @ 30V.While operating, the maximum voltage - Zener (Nom) is reduced to 39VV.This device should be operated at 5mA on the working test voltage.
MTZJT-7239C Features
reverse leakage current of 200nA @ 30V 200nA @ 30V is the maximum voltage (Tol) the working test voltage to 5mA minimal dynamic impedance is 5mA
MTZJT-7239C Applications
There are a lot of ROHM Semiconductor MTZJT-7239C applications of zener single diodes.