The reverse leakage current for this electrical device should be 100nA @ 8V.While operating, the maximum voltage - Zener (Nom) is reduced to 12VV.For its operation, maximum voltage - Forward (Vf) 900mV @ 10mA is provided.
BZX84C12 Features
reverse leakage current of 100nA @ 8V 100nA @ 8V is the maximum voltage (Tol)
BZX84C12 Applications
There are a lot of ON Semiconductor BZX84C12 applications of zener single diodes.