An electrical device like this requires a reverse leakage current of 4μA @ 2V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 4.3V.For operation, diode reaches 900mV @ 10mA at the maximum voltage - Forward (Vf).
MMSZ4687-HF Features
reverse leakage current of 4μA @ 2V 4μA @ 2V is the maximum voltage (Tol)
MMSZ4687-HF Applications
There are a lot of Comchip Technology MMSZ4687-HF applications of zener single diodes.