Vitaliy wrote: > If the maximum power dissipation is not the limiting factor > for the maximum current in a saturated transistor, what is? The current limitations of semiconductor junction. You can't pass more than certain amount of people through a door regardless of pressure you are applying on them without destroying the door. You can't pass more than certain amount of electrons or holes through the junction without destroying the semiconductor structure. Number of electrons (holes) is limited as well as their speed. MS -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist