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).
BZX84W-C6V2F Features
reverse leakage current of 3μA @ 4V 3μA @ 4V is the maximum voltage (Tol)
BZX84W-C6V2F Applications
There are a lot of Nexperia USA Inc. BZX84W-C6V2F applications of zener single diodes.