The peak forward voltage is 1.3 according to the datasheets.This device consumes about 1 continuous forward current at any given time.To operate, a DC reverse voltage less than 800 must be used.
RS1K-E3/63T Features
the forward peak voltage is 1.3
RS1K-E3/63T Applications
There are a lot of Vishay RS1K-E3/63T applications of RF diodes.