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A cooling fin assembly for mounting on a semiconductor package that includes a plurality of pins adapted to be affixed to a surface on the package, and a cooling fin means having a thin walled cellular configuration with the cells defining elongated openings in side-by-side relation that extend thro

A cooling fin assembly for mounting on a semiconductor package that includes a plurality of pins adapted to be affixed to a surface on the package, and a cooling fin means having a thin walled cellular configuration with the cells defining elongated openings in side-by-side relation that extend through the fin means, the pins being seated in the cells of the fin means.

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1. In an electronic semiconductor package having a substrate with at least one integrated circuit semiconductor device mounted thereon, and a lid element forming with the substrate an enclosure for the said semiconductor device, the improvement comprising: a heat dissipating assembly mounted on s

1. In an electronic semiconductor package having a substrate with at least one integrated circuit semiconductor device mounted thereon, and a lid element forming with the substrate an enclosure for the said semiconductor device, the improvement comprising: a heat dissipating assembly mounted on said lid that includes a plurality of pins made of heat conductive material affixed to said lid, cooling fin structure mounted on said plurality of pins, said fin structure comprised of a thin walled cellular structure with of tubular cells open at both ends arranged in side by side relation, said cells of said thin walled cellular structure are of a honeycomb structure with each cell having an even number of sides of equal length, said plurality of pins seated in a plurality of said cells of said fin structure, the relationship serving as a means to mount said fin structure on said package in heat conducting relationship. 2. The semiconductor package of claim 1 wherein the lower side of said fin means is spaced from the underlying surface of said lid. 3. The semiconductor package of claim 2 wherein said pins are provided with shoulder stops spaced from the ends affixed to said lid to control the depth of insertion of said pins into said cells. 4. The semiconductor package of claim 1 wherein said fin structure is formed of aluminum. 5. The semiconductor package of claim 1 wherein said fin structure is formed of copper. 6. The semiconductor package of claim 1 wherein said pins are formed of copper. 7. The semiconductor package of claim 1 wherein said pins have enlarged heads that are bonded to said lid. 8. The semiconductor package of claim 1 wherein a plurality of semiconductor devices are mounted on said substrate and enclosed by said lid, and said pins are bonded to said lid and located over a device beneath said lid. 9. The semiconductor package of claim 1 wherein said pins have a circular cross sectional configuration with a diameter slightly larger than the width of said cells, said pins deforming the walls of said cells upon being introduced, forming a firm frictional engagement.