I am using a high voltage diode (APTDF400U120G) to freewheel an inductor in a switching circuit. It has four terminals, two for either side of the diode. I cannot figure out why this is. If I only connect to one input and one output terminal will the rating of the diode be lowered from the listed 400A? What is the purpose of four terminals?
For both redundancy and reduced overall inductance. You really don't want to have a loose connection being a single point of failure in a 400 A circuit!