According to the datasheets, the peak forward voltage is 1.1.The maximum continuous forward current that this device consumes at any given time is about 1.A DC reverse voltage less than 800 must be used for operation.
S1M-Q Features
the forward peak voltage is 1.1
S1M-Q Applications
There are a lot of Diotec Semiconductor AG S1M-Q applications of RF diodes.