Discussion
A diode dissipates \( 1 \ \mathrm{W} \) with a thermal resistance of \( 60 \ \mathrm{^\circ C/W} \) in a \( 40 \ \mathrm{^\circ C} \) ambient. Its junction reaches
Answer: B
Adding the rise to the ambient:
\[ T_{j} = 40 + (1 \times 60) = 100 \ \mathrm{^\circ C} \]
giving 100 degrees, safely below a silicon limit of 150 but leaving little margin for a hotter ambient. Sixty degrees is the rise alone and forty the ambient alone. Whether a device survives is decided by the sum rather than either term, which is why an ambient specification is as much part of a rating as the power figure.
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