The datasheets state that the peak forward voltage is 0.75.A continuous forward current of about 5 can be consumed by this device at any given time.In order to operate, you will need a DC reverse voltage less than 60.
SK56C R6G Features
the forward peak voltage is 0.75
SK56C R6G Applications
There are a lot of Taiwan Semiconductor SK56C R6G applications of RF diodes.