Discussion
Why do MOSFETs need no emitter ballast when paralleled?
Answer: A
A hot MOSFET conducts less well, so it sheds current to its cooler partners and the sharing self-corrects - negative feedback where a bipolar device has positive. Threshold matching is poor, gate current is irrelevant to sharing, and the safe operating area is a separate advantage. Whether a device's principal imperfection acts with or against an imbalance decides whether it can be paralleled without help.
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