The datasheets state that the peak forward voltage is 0.5.A continuous forward current of about 2.5 can be consumed by this device at any given time.In order to operate, you will need a DC reverse voltage less than 30.
SBT30 Features
the forward peak voltage is 0.5
SBT30 Applications
There are a lot of EIC Semiconductor SBT30 applications of RF diodes.