An electrical device like this requires a reverse leakage current of 1μA @ 5V.For operation, diode reaches 900mV @ 10mA at the maximum voltage - Forward (Vf).
MM3Z7V5ST1 Features
reverse leakage current of 1μA @ 5V 1μA @ 5V is the maximum voltage (Tol)
MM3Z7V5ST1 Applications
There are a lot of ON Semiconductor MM3Z7V5ST1 applications of zener single diodes.