Heat flux discriminates where wattage does not, but it is a signal, not a criterion. A defensible thermal assessment needs six inputs, not one number. Worked example.

High Wattage Is Not the Same as High Thermal Risk: The Six Inputs a Defensible Thermal Assessment Needs

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The short version A defensible thermal assessment cannot rest on total wattage alone — it requires power and power distribution, effective heat-source area, TIM and contact conditions, package and thermal path, cooling boundary conditions, and allowable component or interface temperature. Total power is necessary but does not set difficulty. 200 W over 20 cm² is […]

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