3.37% 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 3V.In order to operate this device, the working test voltage should be set to 5mA.
UDZVTE-173.0B Features
the working test voltage to 5mA minimal dynamic impedance is 5mA
UDZVTE-173.0B Applications
There are a lot of ROHM Semiconductor UDZVTE-173.0B applications of zener single diodes.