According to the datasheets, the peak forward voltage is 1 volts.Having a peak RMS reverse voltage range of 420, this device can be utilized efficiently.
GBU4J-E3/1 Features
the forward peak voltage is 1 the peak RMS reverse voltage range of 420
GBU4J-E3/1 Applications
There are a lot of Vishay GBU4J-E3/1 applications of RF diodes.