According to the datasheets, the peak forward voltage is 0.52 volts.RF diode consumes approximately 5 in continuous forward current at any given moment.For operation, a DC reverse voltage less than 40 must be applied.
FM540B-W-S-AA1 Features
the forward peak voltage is 0.52
FM540B-W-S-AA1 Applications
There are a lot of Rectron FM540B-W-S-AA1 applications of RF diodes.