In the datasheets, 1.1 is stated as the peak forward voltage.A continuous forward current of 1 is the maximum consumption of this device.RF diode is necessary to operate the device at a DC reverse voltage below 1000.
S1PM-E3/84A Features
the forward peak voltage is 1.1
S1PM-E3/84A Applications
There are a lot of Vishay S1PM-E3/84A applications of RF diodes.