An electrical device like this requires a reverse leakage current of 100nA @ 21V.During reverse leakage, the maximum current reaches 100nA.For operation, diode reaches 1.1V @ 200mA at the maximum voltage - Forward (Vf).
1N5255B-TAP Features
reverse leakage current of 100nA @ 21V 100nA @ 21V is the maximum voltage (Tol) Reverse leakage current reaches 100nA
1N5255B-TAP Applications
There are a lot of Vishay Semiconductor Diodes Division 1N5255B-TAP applications of zener single diodes.