This value (Tol) represents the maximum voltage that can be supplied.Zener (Nom) voltage is reduced to 13V during operation.This device should be operated with 5mA as the working test voltage.1.1V @ 200mA is achieved when the maximum voltage - Forward (Vf) is applied for its operation.
1N3521A Features
the working test voltage to 5mA minimal dynamic impedance is 5mA
1N3521A Applications
There are a lot of Microsemi Corporation 1N3521A applications of zener single diodes.