Method of making conduction-cooled circuit package

Details Method of making conduction-cooled circuit package Method of making conduction-cooled circuit package

1976-09-03

1977-07-12

Duzan, James R.

Metal working

Method of mechanical manufacture

Electrical device making

29577, 29626, 174 16HS, 174 685, 357 81, H01R 4300

Patent

active

040344690

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: 3267341 (1966-08-01), Evander
patent: 3381185 (1968-04-01), Whitman et al.
patent: 3429040 (1969-02-01), Miller
patent: 3430335 (1969-03-01), Gee
patent: 3675089 (1972-07-01), Hantusch et al.
patent: 3741292 (1973-06-01), Aakalu et al.
patent: 3972062 (1976-07-01), Hopp
patent: 3993123 (1976-11-01), Chu et al.

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