This value (Tol) represents the maximum voltage that can be supplied.Zener (Nom) voltage is reduced to 27V during operation.This device should be operated with 4mA as the working test voltage.1.1V @ 200mA is achieved when the maximum voltage - Forward (Vf) is applied for its operation.
1N3528A Features
the working test voltage to 4mA minimal dynamic impedance is 4mA
1N3528A Applications
There are a lot of Microsemi Corporation 1N3528A applications of zener single diodes.