An electrical device like this requires a reverse leakage current of 100nA @ 12V.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 16V.For operation, diode reaches 1V @ 10mA at the maximum voltage - Forward (Vf).
BZT55C16 L0G Features
reverse leakage current of 100nA @ 12V 100nA @ 12V is the maximum voltage (Tol)
BZT55C16 L0G Applications
There are a lot of Taiwan Semiconductor Corporation BZT55C16 L0G applications of zener single diodes.