Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1986-07-02
1989-03-07
Tolin, G. P.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
357 81, H05K 720
Patent
active
048111660
ABSTRACT:
A heat dissipating pad or support member for mounting a semiconductor device in an electrical circuit has a metal core with a relatively low coefficient of thermal expansion preferably lower than that of the semiconductor device and has a thermally conducting, corrosion resistant metal coating with relatively greater thermal conductivity than the core. The thermally conducting coating is metallurgically bonded to top, bottom and two lateral surfaces of the core with a selected thickness to cooperate with the core in providing an outer surface portion of the member over the top of the core having an effective coefficient of thermal expansion substantially corresponding to the semiconductor device to reliably mount the semiconductor device thereon. The coating is thicker on at least one of the two lateral core surfaces so that heat collected from the semiconductor device at the top surface of the thermally conducting coating is efficiently transferrred via the lateral surface or surfaces on the core to the portion of the thermally conducting coating on the bottom surface of the member.
REFERENCES:
patent: 3187226 (1965-06-01), Kater
patent: 4363076 (1982-12-01), McIver
patent: 4472762 (1984-09-01), Spinelli et al.
patent: 4546409 (1985-10-01), Yoshino et al.
patent: 4602314 (1986-07-01), Broadbent
patent: 4628407 (1986-12-01), August et al.
Alvarez Juan M.
Breit Henry F.
Hingorany Premkumar R.
Levy Steven E.
Haug John A.
McAndrews James P.
Sharp Melvin
Texas Instruments Incorporated
Tolin G. P.
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