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TECHNICAL PAPERS

Sizing of Heat Spreaders Above Dielectric Layers

[+] Author and Article Information
Calvin Chen, Marc Hodes, Lou Manzione

Bell Laboratories, Lucent Technologies, 700 Mountain Ave., Murray Hill, NJ 07974

J. Electron. Packag 123(3), 173-181 (Feb 12, 2001) (9 pages) doi:10.1115/1.1377271 History: Received April 28, 2000; Revised February 12, 2001
Copyright © 2001 by ASME
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References

Figures

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Top view of the isothermal contours inside the heat spreader
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Shape of isothermal contours predicted by FEA assuming a thin material with constant temperature heat source (100°C) and isothermal bottom (0°C)
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Thermal resistance network representation of the conduction problem
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Thermal resistance (RT) versus extension of heat spreader in x-direction (Wx) computed from thermal resistance network (TRN) approach and finite element analyses (FEA) for given conditions
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Normalized thermal resistance (R̃T) versus nondimensional extension (W̃) for a/b=1 (square heat source) and selected values of resistance ratio (θ). 1rst approximations to the optimum W̃ are denoted by “x.”
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Normalized thermal resistance (R̃T) versus resistance ratio (θ) for a/b=1 (square heat source) and selected extensions of heat spreader (W̃). 1rst approximations of the optimum θ are denoted by an “x.”
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Normalized thermal resistance (R̃T) versus nondimensional extension (W̃) for a/b=0.1 and selected resistance ratios (θ)
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Thermal resistance for nonsquare (a/b<1) heat source divided by thermal resistance for square (a/b=1) heat source (RT/RT(a/b=1)) as a function of W̃ for θ=23.0 and selected values of a/b. Areas of the footprints of the heat spreader and power device are the same in both cases and W̃ on the abscissa corresponds to the square heat source.
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Normalized thermal resistance (R̃T) versus nondimensional extension in x-direction (W̃x) for Wy/Wx=0.1,0.2,[[ellipsis]],1.0 and a/b=0.05, 0.10, and 1.0 at θ=23.0
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Normalized thermal resistance (R̃T) versus resistance ratio (θ) for fixed nondimensional extension in x-direction (W̃x=0.2) and Wy/Wx=0.0,0.1,0.2,[[ellipsis]],1 at a/b=0.05, 0.10, and 1.0
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Normalized thermal resistance (R̃T) versus resistance ratio (θ) for fixed nondimensional extension in x-direction (W̃x=0.8) and Wy/Wx=0.0,0.1,0.2,[[ellipsis]],1 at a/b=0.05, 0.10, and 1.0
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Normalized thermal resistance (R̃T) versus nondimensional extension in x-direction (W̃x) as a function of resistance ratio (θ) for Wy/Wx=0 and 1 at a/b=1
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Top and side views of a power-dissipating device mounted on a heat spreader attached to a dielectric material connected to thermal ground

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