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Why do MOSFETs parallel more readily than bipolar transistors?

  • A.Their threshold voltages match closely between devices
  • B.Their gates can be driven from one common voltage source
  • C.Their safe operating areas overlap sufficiently to share
  • D.Current sharing is self-correcting through the on-resistance

Answer: D

The device taking more current heats, its resistance rises, and it takes less - negative feedback that equalises the sharing without any external component. Thresholds do not match especially well, a common gate drive is convenient but not the mechanism, and the safe operating area is a separate matter. Whether an imperfection acts with or against an imbalance decides whether devices can be paralleled at all. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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