According to the datasheets, the peak forward voltage is 0.5.The maximum continuous forward current that this device consumes at any given time is about 0.1.
DSF01S30SL,L3F(T Features
the forward peak voltage is 0.5
DSF01S30SL,L3F(T Applications
There are a lot of Toshiba DSF01S30SL,L3F(T applications of RF diodes.