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- W2113249900 abstract "The use of preformed solder spheres for bumping flip chip wafers has not gained wide acceptance within the semiconductor industry. Due in part to equipment shortcomings, solder sphere transfer until now was commonly limited to spheres 300 /spl mu/m or larger, much too large for the typical flip chip applications of 150 /spl mu/m or less. To address this need, Texas Instruments and DuPontB have jointly developed a process for transferring 127 /spl mu/m diameter solder spheres to wafers. The process, called Tacky Dots/sup TM/, forms are array of sticky or tacky dots in a photoimageable adhesive coating. Solder spheres sprinkled on the adhesive coating are then captured and retained by the tacky dots until the spheres are aligned and reflowed to the wafer. This paper describes the equipment and processes developed for bumping wafers using Tacky Dots/sup TM/. The compliant polyimide sheet used in Tacky Dots/sup TM/ required a new and unique equipment design that aligns the solder spheres to the wafer and then reflows the solder without moving the wafer. Post reflow analysis of the bumped dies before and after environmental testing is reviewed. Tests conducted with a leadless chip carrier package design are also reviewed to demonstrate the capability of Tacky Dots/sup TM/ at transferring spheres to electronic packages and substrates other than wafers." @default.
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- W2113249900 date "2002-11-27" @default.
- W2113249900 modified "2023-09-26" @default.
- W2113249900 title "Tacky Dots/sup TM/ transfer of solder spheres for flip chip and electronic package applications" @default.
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- W2113249900 doi "https://doi.org/10.1109/ectc.1998.678730" @default.
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