5% is the maximum voltage (Tol) that can be supplied.Zener single diode is important to note that during operation, the maximum voltage - Zener (Nom) is reduced to 8.5V.In order to operate this device, the working test voltage should be set to 0.5mA.Zener single diode reaches 0.17mV/°C when the voltage (Temp Coeff) reaches maximum.
1N4777A Features
the working test voltage to 0.5mA minimal dynamic impedance is 0.5mA
1N4777A Applications
There are a lot of Microsemi Corporation 1N4777A applications of zener single diodes.