A voltage of 5.13% indicates the maximum voltage (Tol) that can be supplied.The design flexibility of this device is extremely high since its zener current is 2mA.If you want this device to work properly, you should set the peak reverse voltage to 100nA.
BZT52C39S-7 Features
the zener current of 2mA
BZT52C39S-7 Applications
There are a lot of Diodes Incorporated BZT52C39S-7 applications of zener single diodes.