In the datasheets, 1.15 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 600.
S5J R6 Features
the forward peak voltage is 1.15
S5J R6 Applications
There are a lot of Taiwan Semiconductor S5J R6 applications of RF diodes.