High-density package
First Claim
Patent Images
1. A chip carrier comprising:
- a chip carrier body having a cavity therein, and a lower mounting space, on the bottom of said cavity, for mounting at least one integrated circuit chip;
at least one bonding ledge having contact pads thereon in proximity to said mounting space inside said cavity;
at least one heat plate mounted above said lower mounting space within said cavity;
said heat plate being attached with low thermal resistance to said body of said chip carrier, said heat plate having a second mounting surface thereon for mounting at least one integrated circuit chip thereon;
at least one integrated circuit chip mounted on said lower mounting space, and at least one integrated circuit chip mounted on said second mounting surface;
a plurality of connecting leads linking contact pads on said integrated circuits to selected contact pads on said bonding ledges; and
a lid hermetically sealed to said body of said chip cavity, said lid and said chip cavity enclosing therebetween said lower mounting space, said heat plate, and said chips mounted to said space and said heat plate;
wherein said heat plate comprises openings to expose plural ones of said contact pads on said bonding ledges.
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Accused Products
Abstract
A chip carrier with improved packing density, wherein at least one layer of chips is bonded not directly to the substrate, but rather to a heat plate which attaches over the chip cavity and inside the hermetic sealing lid. The heat plate has openings in it to permit attachment of the leads from the chips in the upper layer to bond pads on a bonding ledge inside the cavity of the chip carrier, after the heat plate is emplaced. Each bonding ledge is preferably made somwhat wider than it would otherwise be, and the leads from multiple layers of chips are preferably bonded onto the same bonding ledge.
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Citations
36 Claims
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1. A chip carrier comprising:
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a chip carrier body having a cavity therein, and a lower mounting space, on the bottom of said cavity, for mounting at least one integrated circuit chip; at least one bonding ledge having contact pads thereon in proximity to said mounting space inside said cavity; at least one heat plate mounted above said lower mounting space within said cavity; said heat plate being attached with low thermal resistance to said body of said chip carrier, said heat plate having a second mounting surface thereon for mounting at least one integrated circuit chip thereon; at least one integrated circuit chip mounted on said lower mounting space, and at least one integrated circuit chip mounted on said second mounting surface; a plurality of connecting leads linking contact pads on said integrated circuits to selected contact pads on said bonding ledges; and a lid hermetically sealed to said body of said chip cavity, said lid and said chip cavity enclosing therebetween said lower mounting space, said heat plate, and said chips mounted to said space and said heat plate; wherein said heat plate comprises openings to expose plural ones of said contact pads on said bonding ledges. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18)
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15. The chip carrier of claim 15, wherein said thermal contact comprises a very soft metal.
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16. A circuit board assembly comprising:
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a board substrate; a plurality of chip carrier packages affixed to said substrate; and a plurality of traces interconnecting said chip carrier packages to configure a desired macroscopic circuit configuration; wherein at least some of said chip carriers comprise; (a) a chip carrier body having a cavity therein, and a lower mounting space on the bottom of said cavity, for mounting at least one integrated circuit chip; (b) at least one bonding ledge having contact pads thereon in proximity to said mounting space inside said cavity; (c) at least one heat plate mounted above said lower mounting space within said cavity; (d) said heat plate being attached with low thermal resistance to said body of said chip carrier, said heat plate having a second mounting surface thereon for mounting at least one integrated circuit chip thereon said heat plate comprising openings which expose plural ones of said contact pads on said bonding ledges; (e) at least one integrated circuit chip mounted on said lower mounting space, and at least one integrated circuit chip mounted on said second mounting surface; (f) a plurality of connecting leads linking contact pads on said integrated circuits to selected contact pads on said bonding ledges; and (g) a lid hermetically sealed to said body of said chip cavity, said lid and said chip cavity enclosing therebetween said lower mounting space, said heat plate, and said chips mounted to said space and said heat plate. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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19. The chip carrier of 17, wherein said openings in heat plate are indentations around the periphery of said heat plate.
Specification