A 1N4742A has a maximum power rating of 1.0 W at 50 °C. The derating factor is 9.67 mW/°C. If it is operated at 70 °C, the maximum power is
A)0.8 W
B)1.1 W
C)0.9 W
D)1.2 W

Question

Quizplus · Accepted Answer

The maximum power at 70°C is calculated by subtracting the derating factor multiplied by the temperature increase from the original power rating: 1.0 W - (9.67 mW/°C * 20°C) = 0.8 W.

A 1N4742A Has a Maximum Power Rating of 1