Active solid-state devices (e.g. – transistors – solid-state diode – Housing or package – Insulating material
Reexamination Certificate
2006-11-10
2009-02-10
Purvis, Sue A (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Housing or package
Insulating material
C257S706000, C257S707000, C257S710000, C257SE23051
Reexamination Certificate
active
07489033
ABSTRACT:
A composite of two or more thermal interface materials (“TIMs”) is placed between a die and a heat spreader to improve cooling of the die in an integrated circuit package. The two or more TIMs vary in heat-dissipation capability depending upon the locations of die hot spots. In an embodiment, a more thermally conductive material may be positioned over one or more die hot spots, and a less thermally conductive material may be positioned abutting and/or surrounding the more thermally conductive material. The two or more TIMs may comprise a solder and a polymer. The composite TIM may be preformed as one unit or as a plurality of units. Methods of fabrication, as well as application of the package to an electronic assembly and to an electronic system, are also described.
REFERENCES:
patent: 6706562 (2004-03-01), Mahajan et al.
patent: 7328508 (2008-02-01), Edwards et al.
Deppisch Carl L.
Hansen Joni G.
Hua Fay
Xu Youzhi E.
Ahmed Selim
Intel Corporation
Purvis Sue A
Schwegman Lundberg & Woessner, P.A.
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