An electrical device like this requires a reverse leakage current of 3μA @ 4V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 6.2V.For operation, diode reaches 900mV @ 10mA at the maximum voltage - Forward (Vf).
BZT52-B6V2J Features
reverse leakage current of 3μA @ 4V 3μA @ 4V is the maximum voltage (Tol)
BZT52-B6V2J Applications
There are a lot of Nexperia USA Inc. BZT52-B6V2J applications of zener single diodes.