Heatsink for board-mounted semiconductor devices and semiconduct

Details Heatsink for board-mounted semiconductor devices and semiconduct Heatsink for board-mounted semiconductor devices and semiconduct

1991-10-08

1992-12-15

Tolin, Gerald P.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

165185, 174 163, 257720, 257783, H05K 720

Patent

active

051723018

ABSTRACT:
A semiconductor device is mounted to one face of a printed wiring board (PWB). A heat sink is mounted to an opposite face of the board, opposite the die. The heat sink has a plurality (at least four) "nubs" protruding through a like plurality of holes in the board in the region of the die. In this manner, the nubs conduct heat from the die, through the board, to the heat sink. Preferably, the nubs are sized and shaped to press fit into the holes. Preferably, the holes are plated. Preferably, the heat sink is formed of powdered metal, such as aluminum, copper or a copper/tungsten alloy. The die is attached to the board by any suitable method, such as epoxy and wire bonding, tape automated bonding (TAB), etc. After the heat sink is mounted to the board, the die is encapsulated with resin. A multi-chip module using the novel heat sink structure is also disclosed.

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patent: 4996629 (1991-02-01), Christiansen
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