Method of producing an article comprising a multichip assembly

Details Method of producing an article comprising a multichip assembly Method of producing an article comprising a multichip assembly

1989-02-24

1990-09-04

Hearn, Brian E.

Fishing, trapping, and vermin destroying

437209, 29762, 29742, 29847, H05K 300, H01L 2166

Patent

active

049544535

ABSTRACT:
In methods of producing an article that comprises a multichip assembly, in which the (typically electronic but not excluding opto-electronic) chips are bonded to a substrate by means of spaced-apart localized solder regions (frequently referred to as "solder bumps"), it is frequently desirable to be able to remove a given chip from the substrate and to replace it with another chip. According to the invention, such chip removal is accomplished by a technique that comprises heating the solder bumps between the given chip and the substrate to a temperature below the solidus temperature of the solder in a manner such that a temperature gradient exists across the solder bumps, and applying to the given chip simultaneously a torque and a lifting force sufficient to cause separation of the given chip from the substrate. The technique can be carried out such that the solder bumps remaining on the substrate after chip removal are of substantially uniform height, facilitating attachment of the replacement chip.

REFERENCES:
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patent: 4806503 (1989-02-01), Yoshida et al.
Journal of Electronic Materials, vol. 18, No. 1, 1984, "Flip-Chip Replacement Within The Constraints Imposed By Multilayer Ceramic (MLC) Modules", by K. T. Puttlitz, pp. 29-46.
Solid State Technology, 1986, "Advanced Packaging for VLSI", by C. J. Bartlett et al, pp. 119-123.
Proceedings of the Electronic Components Conference, Boston, May 1987, C. J. Bartlett et al.

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