An electrical device like this requires a reverse leakage current of 50nA @ 16.8V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 24V.For operation, diode reaches 900mV @ 10mA at the maximum voltage - Forward (Vf).
BZT52-B24J Features
reverse leakage current of 50nA @ 16.8V 50nA @ 16.8V is the maximum voltage (Tol)
BZT52-B24J Applications
There are a lot of Nexperia USA Inc. BZT52-B24J applications of zener single diodes.