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Answered

A transistor with a height of 0.4 cm and a diameter of 0.6 cm is mounted on a circuit board. The transistor is cooled by air flowing over it with an average heat transfer coefficient of 30 W/m2°C air = 30°C If the air temperature is 55°C and the transistor case temperature is not to exceed 70°C, determine the amount of power this transistor can dissipate safely. Disregard any heat transfer from the transistor base.

Answer :

OGORWYNEIN

The minimum safety power that is safely dissipated using a transistor of height 0.4cm and diameter 0.06cm is 0.04665

Calculation for the exposed area

[tex]\pi DL +\frac{\pi }{4} D^2\\\\Area = 3.14 * 0.6*0.4+\frac{3.14}{4} *0.6^2[/tex]

D = diameter = 0.6cm

Length = height = 0.4cm

Area = 1.0367cm²

minimum safety heat that is dissipated

hA (Ts - Tair)

30 * 1.0367 x 10⁻⁴(70-55)

= 0.04665

The minimum safety power that is safely dissipated is 0.04665W

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