A transistor with a height of 0.4 cm and a diameter of 0.6 cm is mounted on a circuit board as shown in Figure 5. The transistor is cooled by air flowing over it with an average heat transfer coefficient of 30 W/m?.K. 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. Air 55°C Power transistor 0.6 cm Ts<70°C 0.4 cm
A transistor with a height of 0.4 cm and a diameter of 0.6 cm is mounted on a circuit board as shown in Figure 5. The transistor is cooled by air flowing over it with an average heat transfer coefficient of 30 W/m?.K. 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. Air 55°C Power transistor 0.6 cm Ts<70°C 0.4 cm
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Transcribed Image Text:A transistor with a height of 0.4 cm and a diameter of 0.6 cm is mounted on a circuit
board as shown in Figure 5. The transistor is cooled by air flowing over it with an
average heat transfer coefficient of 30 W/m?.K. 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.
Air
55°C
Power
transistor O.6 cm
TS70°C
0.4 cm
Figure 5
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