5% is the maximum voltage (Tol) that can be supplied.In order to operate this device, the working test voltage should be set to 2mA.A peak reverse voltage of 50nA is recommended for this device to function fully.
BZX84C47TA Features
the working test voltage to 2mA minimal dynamic impedance is 2mA
BZX84C47TA Applications
There are a lot of Diodes Incorporated BZX84C47TA applications of zener single diodes.