The peak forward voltage is 0.94 according to the datasheets.This device consumes about 20 continuous forward current at any given time.To operate, a DC reverse voltage less than 130 must be used.
FX20K120 Features
the forward peak voltage is 0.94
FX20K120 Applications
There are a lot of Diotec Semiconductor AG FX20K120 applications of RF diodes.