Tol is the maximum voltage that can be supplied (5%).The maximum voltage - Zener (Nom) is reduced to 9.1V during operation.Working test voltage should be set to 1mA for this device to operate.
1N4772A Features
the working test voltage to 1mA minimal dynamic impedance is 1mA
1N4772A Applications
There are a lot of Microsemi Corporation 1N4772A applications of zener single diodes.