Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1985-02-06
1987-02-24
Pellinen, A. D.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
165185, 174 16HS, 357 81, 361386, H05K 720
Patent
active
046462031
ABSTRACT:
A mounting structure is disclosed for mounting a semiconductor device on a conductive heat sink while electrically insulating the two. A thin, flat thermally conductive electrically insulative sheet is disposed between a flat electrically conductive surface of the semiconductor device and the flat electrically conductive surface of the heat sink which is to receive the semiconductor device. The semiconductor device is fixed to the insulation sheet by a first electrically conductive rivet which compresses the two together. The opening in the insulation sheet through which the rivet passes is enlarged so that no radial forces are applied to the sheet by expansion of the rivet. The rivet head on the bottom of the insulation sheet extends into an enlarged opening in the underlying heat sink but does not touch the opening. The insulation sheet is connected to the heat sink by a second conductive rivet which is laterally displaced from the first, and applies compressive forces between the insulation sheet and heat sink. The opening in the insulation sheet receiving the second rivet is also enlarged so that radial forces cannot be applied from the rivet to the insulation sheet. The insulation sheet is sufficiently rigid so as to hold the full surface of the semiconductor device against the full adjacent surface of the sheet, and to hold the opposite surface of the sheet against the heat sink. The invention is used for mounting of various semiconductor device package styles including the TO-220 outline and the stud mounted outline package.
REFERENCES:
patent: 3611046 (1971-10-01), Covert
patent: 3801874 (1974-04-01), Stefani
Jacoby Elliot G.
Ngo Dat V.
Lutron Electronics Co. Inc.
Pellinen A. D.
Thompson Gregory D.
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