Discussion
Why is an insulating washer often needed under a power device?
Answer: D
In most power packages the metal tab is the collector or the drain, so bolting it directly to a grounded heatsink would short that terminal. The washer insulates electrically while conducting heat as well as it can, which is a compromise that adds to the interface resistance. Mica, silicone rubber and anodised aluminium all trade insulation quality against thermal resistance differently, and choosing between them is a real design decision rather than a detail. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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