Active solid-state devices (e.g. – transistors – solid-state diode – With shielding
Patent
1991-05-24
1995-10-17
Crane, Sara W.
Active solid-state devices (e.g., transistors, solid-state diode
With shielding
257491, 257503, 361767, H01L 2504, H01L 3902
Patent
active
054593484
ABSTRACT:
The present invention provides a heat sink and electromagnetic interference shield assembly for a plurality of semiconductor elements. The semiconductor elements are connected with other circuit elements to form an electrical circuit. Each semiconductor element has a metal portion for dissipating heat generated by the semiconductor element. The metal portion also emits electrical energy as a result of the operation of the semiconductor element thereby causing unwanted electromagnetic interference. The assembly comprises an insulator attached to the meted portion of the semiconductor element and a substrate for mounting the plurality of semiconductor elements. The insulator is of a thermally conductive material to facilitate the conduction of thermal energy away from the semiconductor element. The substrate has a metal base layer, a middle insulating layer, and a plurality of metal mounting areas for mounting the plurality of semiconductor elements. The electrical energy emitted by each semiconductor element is capacitively coupled to its corresponding metal mounting area. The assembly also contains a conductive path for returning the electrical energy coupled to the metal mounting area to one of the circuit elements such that the amount of electromagnetic interference is reduced.
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Astec International Ltd.
Crane Sara W.
Monin D.
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