Discussion
What makes up the thermal path from junction to ambient?
Answer: D
Three resistances in series carry the heat outward: the device's internal path, the mounting interface with its insulating washer and compound, and the heatsink's own path to the air. Omitting any of them understates the junction temperature, and the interface is the one most often forgotten despite being easily the most variable. A series chain is only as good as its largest term, which is usually the heatsink but can be a badly made interface. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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