In the datasheets, 0.75 is stated as the peak forward voltage.A continuous forward current of 5 is the maximum consumption of this device.RF diode is necessary to operate the device at a DC reverse voltage below 60.
SK56B R5 Features
the forward peak voltage is 0.75
SK56B R5 Applications
There are a lot of Taiwan Semiconductor SK56B R5 applications of RF diodes.