Peak forward Surge Current (IFSM) - A peak forward
surge current rating is given for most rectifier
diodes. Most often, this rating corresponds to
the maximum peak value of a single half- sine
wave (50 or 60Hz) which, when superimposed
upon the devices rated load current (JEDEC
method), can be conducted, without damage by
the rectifier. This rating becomes important when
considering the large capacitance associated
with multiplier circuitry