Conduction-cooled circuit package

Details Conduction-cooled circuit package Conduction-cooled circuit package

1977-03-18

1978-03-28

James, Andrew J.

Electricity: conductors and insulators

Feedthrough or bushing

Compression

357 65, 357 79, 357 80, 174 16HS, H01L 2348, H01L 2940, H01L 2302

Patent

active

040818250

ABSTRACT:
A circuit package exhibiting an excellent heat transfer path from a semiconductor chip or other heat-generating device to the heat-sink can or cover of the package. A heat-conducting pad is metallurgically bonded to either said cover or a surface of said device; the pad is also separably attached, but metallurgically unbonded, to the other. In one preferred embodiment, a readily deformable metal or alloy, such as indium, is metallurgically bonded to a limited central region of the heat sink cover. The deformable metal is separably attached to a major surface of the chip so that there is no stress between the chip or its joints and the solder during the electrical operation of the chip when it generates heat. The preferred method of fabrication involves the mechanical deformation of a mass of solder against the back side of the chip, after the solder has been metallurgically bonded to heat sink. The process may be accomplished either at high or low temperatures, depending upon the solder composition and the relative strength of the leads which join the chip to conductive lands on its supportive substrate.

REFERENCES:
patent: 2776920 (1957-01-01), Dunlap
patent: 2903629 (1959-09-01), Walker
patent: 3197839 (1965-08-01), Tiemann
patent: 3414775 (1968-12-01), Melan et al.
patent: 3504096 (1970-03-01), Nagel
patent: 3868725 (1975-02-01), Degraaff
Heat Dissipator Assemblies; IBM Technical Bulletin, vol. 8, No. 10, Mar. 1966, pp. 1460-1461.
Chip Cooling by Ing, IBM Technical Bulletin, vol. 13, No. 5, Oct. 1970, p. 1060.
External Module Heat Sink Fastened to Board, by Ing, IBM Technical Bulletin, vol. 14, No. 1, June 1971, p. 182.
Conduction Cooled Chip Module, by Hill, IBM Technical Bulletin, vol. 14, No. 9, Feb. 1972, p. 2689.

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