The datasheets state that the peak forward voltage is 1.15.A continuous forward current of about 2 can be consumed by this device at any given time.In order to operate, you will need a DC reverse voltage less than 200.
S2DHR4 Features
the forward peak voltage is 1.15
S2DHR4 Applications
There are a lot of Taiwan Semiconductor S2DHR4 applications of RF diodes.