According to the datasheets, the peak forward voltage is 1.2.The maximum continuous forward current that this device consumes at any given time is about 1@Ta=55C.A DC reverse voltage less than 50 must be used for operation.
SM4933-W Features
the forward peak voltage is 1.2
SM4933-W Applications
There are a lot of Rectron SM4933-W applications of RF diodes.