Transistor clamp

H - Electricity – 05 – K

Patent

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Details

H05K 7/12 (2006.01) H01L 23/32 (2006.01) H01L 23/367 (2006.01) H01L 23/40 (2006.01) H05K 3/32 (2006.01)

Patent

CA 2307631

An aluminum heat sink bridge (1), mounted overlying a transistor unit (5) on a circuit board (12), has affixed to its underside, along two lateral edges, a pair of resilient plastic or rubber members (4), which, when the bridge is screwed down into place, exert continuous vertical pressure on the collector tab (8) and the base tab (7) keeping them in electrical contact with their underlying electrical contact points on the circuit board (12) while permitting horizontal movement of the tabs due to variations in temperature. One embodiment of the invention has resilient members extending the entire length of the bridge to exert vertical pressure on grounding tabs (9) extending laterally from the ends of the transistor unit.

La présente invention concerne un pont dissipateur de chaleur en aluminium (1), monté par-dessus une unité de transistor (5) sur une plaquette (12), et dont la face inférieure porte, le long de deux bords latéraux, une paire d'éléments en caoutchouc ou en plastique élastique (4), qui, lorsque le pont est serré à vis, exercent une pression verticale continue sur la borne d'alimentation (8) et sur la borne de base (7), ce qui les maintient en contact électrique avec la plaquette (12) par leurs points de contact électriques sous-jacents, tout en permettant le déplacement horizontal des bornes en raison des variations thermiques. Une des réalisations de cette invention comporte des éléments élastiques s'étendant sur toute la longueur du pont, de manière à exercer une pression verticale sur les bornes de terre (9) s'étendant latéralement depuis les extrémités de l'unité du transistor.

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