Active solid-state devices (e.g. – transistors – solid-state diode – Housing or package – With provision for cooling the housing or its contents
Patent
1995-06-07
1998-04-28
Whitehead, Carl W.
Active solid-state devices (e.g., transistors, solid-state diode
Housing or package
With provision for cooling the housing or its contents
257713, 257717, 257704, 257705, 361704, 361705, 361712, 361751, H01L 2334, H05K 720
Patent
active
057448639
ABSTRACT:
An aluminum or copper heat sink is attached to a ceramic cap or exposed semiconductor chip using flexible-epoxy to provide improved thermal performance. The aluminum may be coated by anodizing or chromate conversion or the copper may be coated with nickel. Such structures are especilly useful for CQFP, CBGA, CCGA, CPGA, TBGA, PBGA, DCAM, MCM-L, single layer ceramic, and other chip carrier packages as well as for flip chip attachment to flexible or rigid organic circuit boards. These adhesive materials withstand thermal cycle tests of 0.degree. to 100.degree. C. for 1,500 cycles, -25.degree. to 125.degree. C. for 400 cycles, and -40.degree. to 140.degree. C. for 300 cycles; and withstand continuous exposure at 130.degree. C. for 1000 hours without loss of strength. Flexible-epoxies have a modulus of elasticity below 100,000 psi and a glass transition temperature below 25.degree. C., are much stronger than typical silicone adhesives, and do not contaminate the module or circuit board with silicone. The flexible epoxy may contain a material having a low coefficient of thermal expansion (CTE) in order to provide a CTE between that of the silicon die and the metal of the heat sink.
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Technical Data Sheet--Ablebond P1-8971, "Low Stress Die Attach Adhesive". no date.
Technical Data Sheet--Experimental Product XP-080792-3, "Low Stress Heat Sink Attach". no date.
IBM Technical Disclosure Bulletin, vol. 21, No. 4A, Sep., 1989, "Removal of Heat From Direct Chip Attach Circuitry", pp. 346-348, by Schrottke et al.
Culnane Thomas Moran
Gaynes Michael Anthony
Seto Ping Kwong
Shaukatullah Hussain
International Business Machines - Corporation
Whitehead Carl W.
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