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Optimum Design of Medium-Power Transistor Heat Sinks

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1 Author(s)
Tramposch, H. ; AMF Corporation

Theoretical expressions were developed for the thermal resistance of finned, medium-power transistor heat sinks which are mounted on printed-circuit boards, with part of the cooling air free to by-pass over other components of the board. Optimizing these expressions, the fin number that will give the lowest thermal resistance for given conditions within a logic gate can be obtained. Theoretical results were in good agreement with experimental data, and indicated that, within the range of practical applications, thermal resistance of double-finned heat sinks is independent of the number of fins.

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Component Parts, IEEE Transactions on  (Volume:10 ,  Issue: 2 )