An electrical device like this requires a reverse leakage current of 100nA @ 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).
BZX84C24 RFG Features
reverse leakage current of 100nA @ 16.8V 100nA @ 16.8V is the maximum voltage (Tol)
BZX84C24 RFG Applications
There are a lot of Taiwan Semiconductor Corporation BZX84C24 RFG applications of zener single diodes.