According to the datasheets, the peak forward voltage is 1.The maximum continuous forward current that this device consumes at any given time is about 1.A DC reverse voltage less than 100 must be used for operation.
1N4002 R0 Features
the forward peak voltage is 1
1N4002 R0 Applications
There are a lot of Taiwan Semiconductor 1N4002 R0 applications of RF diodes.