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 19.2V.Zener single diode reaches 0.384mV/°C when the voltage (Temp Coeff) reaches maximum.
1N4924 Features
1N4924 Applications
There are a lot of Microsemi Corporation 1N4924 applications of zener single diodes.