Meant to provide datasheet link http://www.irf.com/product-info/datasheets/data/100bgq015.pdf > As a good albeit somewhat extreme example, the IR 100BGGQ015 is rtaed > at 100A and 15 V VRRM. > At Tj =3D 25 C the maximum reverse leakage current is 18 mA. > Hardly significant compared to 100 A. But certainly noticeable. > BUT at Tj =3D 100C Irm max is 700 mA max at 12 V reverse voltage, > and at 125 C it's 1.2 A at 5V reverse voltage. They don't specify it > at 12 V at 125 C :-). > > That's "only" 1.2% of Imax but having 1.2A off current can be > extremely unacceptable. > > As a bonus, Vf (forward voltage) drops with rising temperature at > currents below 100% rating. > eg about 0.25V at 10A at 25C but about hald that at 10A 125C. > > Fig 8 is specially for Joe - inductive clamp test at large current. > > > =A0 =A0 =A0 =A0 Russell McMahon > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .