According to the datasheets, the peak forward voltage is 1.3.The maximum continuous forward current that this device consumes at any given time is about 5@Ta=55C.A DC reverse voltage less than 400 must be used for operation.RF diode is recommended to keep the forward voltage of the system above 1.3 V.
SF56 R0 Features
the forward peak voltage is 1.3
SF56 R0 Applications
There are a lot of Taiwan Semiconductor SF56 R0 applications of RF diodes.