An electrical device like this requires a reverse leakage current of 50nA @ 24V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 30V.For operation, diode reaches 1V @ 200mA at the maximum voltage - Forward (Vf).
CDLL4476 Features
reverse leakage current of 50nA @ 24V 50nA @ 24V is the maximum voltage (Tol)
CDLL4476 Applications
There are a lot of Microsemi Corporation CDLL4476 applications of zener single diodes.