The peak forward voltage is 1.1 according to the datasheets.This device can operate efficiently with a reverse voltage range of 420.Keeping the forward voltage of the system above 1.1(V) is recommended.
RBV2506D Features
the forward peak voltage is 1.1 the peak RMS reverse voltage range of 420
RBV2506D Applications
There are a lot of EIC Semiconductor RBV2506D applications of RF diodes.