An electrical device like this requires a reverse leakage current of 2μA @ 25.1V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 33V.This device must be operated with the working test voltage set to 40mA.
1N4970US Features
reverse leakage current of 2μA @ 25.1V 2μA @ 25.1V is the maximum voltage (Tol) the working test voltage to 40mA minimal dynamic impedance is 40mA
1N4970US Applications
There are a lot of Semtech Corporation 1N4970US applications of zener single diodes.