The datasheets indicate that the peak forward voltage is 1.1.At any given time, this device consumes about 1@Ta=75C continuous forward current.The DC reverse voltage must be less than 50.
1N4001E-E3/71 Features
the forward peak voltage is 1.1
1N4001E-E3/71 Applications
There are a lot of Vishay 1N4001E-E3/71 applications of RF diodes.