An electrical device like this requires a reverse leakage current of 3μA @ 5V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 6.8V.For operation, diode reaches 900mV @ 10mA at the maximum voltage - Forward (Vf).
SFC6V850 Features
reverse leakage current of 3μA @ 5V 3μA @ 5V is the maximum voltage (Tol)
SFC6V850 Applications
There are a lot of SMC Diode Solutions SFC6V850 applications of zener single diodes.