In the datasheets, 1.8 is stated as the peak forward voltage.A continuous forward current of 0.5@Ta=55C is the maximum consumption of this device.RF diode is necessary to operate the device at a DC reverse voltage below 1800.
RL1N1800F-T Features
the forward peak voltage is 1.8
RL1N1800F-T Applications
There are a lot of Rectron RL1N1800F-T applications of RF diodes.