In the datasheets, 1.3 is stated as the peak forward voltage.A continuous forward current of 2 is the maximum consumption of this device.RF diode is necessary to operate the device at a DC reverse voltage below 50.
RS2A R4 Features
the forward peak voltage is 1.3
RS2A R4 Applications
There are a lot of Taiwan Semiconductor RS2A R4 applications of RF diodes.