An electrical device like this requires a reverse leakage current of 100nA @ 8V.During reverse leakage, the maximum current reaches 100nA.While the device is operating, the maximum voltage - Zener (Nom) is reduced to 12V.For operation, diode reaches 1.5V @ 200mA at the maximum voltage - Forward (Vf).
NZX12B,133 Features
reverse leakage current of 100nA @ 8V 100nA @ 8V is the maximum voltage (Tol) Reverse leakage current reaches 100nA
NZX12B,133 Applications
There are a lot of Nexperia USA Inc. NZX12B,133 applications of zener single diodes.