In the datasheets, 1 is stated as the peak forward voltage.In order to operate efficiently, this device should have a peak RMS reverse voltage range of 70.A forward voltage of over 1 V is recommended for the system.
GBU4B-E3/72 Features
the forward peak voltage is 1 the peak RMS reverse voltage range of 70
GBU4B-E3/72 Applications
There are a lot of Vishay GBU4B-E3/72 applications of RF diodes.