An electrical device like this requires a reverse leakage current of 10μA @ 1V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 3.9V.For operation, diode reaches 900mV @ 10mA at the maximum voltage - Forward (Vf).
MMSZ5228BT1 Features
reverse leakage current of 10μA @ 1V 10μA @ 1V is the maximum voltage (Tol)
MMSZ5228BT1 Applications
There are a lot of Rochester Electronics, LLC MMSZ5228BT1 applications of zener single diodes.