The peak forward voltage is 0.55 according to the datasheets.This device consumes about 5 continuous forward current at any given time.To operate, a DC reverse voltage less than 40 must be used.
SK54C TRTB Features
the forward peak voltage is 0.55
SK54C TRTB Applications
There are a lot of Fagor Electronica SK54C TRTB applications of RF diodes.