Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1997-05-07
1999-03-09
Brown, Glenn W.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324755, 174261, 439 66, G01R 3102, H01R 909, H01R 2368, H05K 111
Patent
active
058805907
ABSTRACT:
Temporary connections are formed to a flip-chip style chip having solder bumps or preforms protruding therefrom for testing and burn-in while avoiding distortion of the solder bumps or preforms and avoiding wear and damage to a test or burn-in jig such as a ball grid array by the use of a preferably resilient bucketed interposer which includes recesses which have a depth greater than the protrusion of the solder bumps or preforms and, preferably are narrowed at one side to a tear-drop shape. Metallization in the recesses and contacts on the interposer which mate with the test or burn-in jig are preferably textured with dendrites to be self-cleaning. A bevelled tongue and groove arrangement translates a slight compressive force to a slight shearing force between the interposer and the chip to ensure good connections to the protruding solder bumps or preforms on the chip. Any deformation of the solder bumps or preforms thus tends to only improve accuracy of positioning of the solder bumps or preforms and avoids solder voiding due to compression distortion of the solder bumps or preforms. Full burn-in and functional testing can then identify "known good" chips or dies before package completion, particularly to avoid rework of modular circuit packages.
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Desai Kishor V.
Hromek Joseph
Brown Glenn W.
Fraley, Esq. Larry
International Business Machines - Corporation
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