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- W2540193419 abstract "In this paper, Cu/SnAg double-layered bumps structure was proposed and investigated for the fine pitch flip chip applications. Test chip was designed considering the recent high speed memory device and its pad size and pitch was 60/spl mu/m and 100/spl mu/m, respectively. Cu and SnAg bumps were fabricated as a 60/spl mu/m and 20/spl mu/m thickness on SiO/sub 2//Ti/TiN/Al/TiW/Cu on Si wafer using the electroplating method. Test chip was flip chip assembled with PCB substrates using thermo-compression bonding method. Because the pitch was very tight, the flip chip bonding of Cu/SnAg double bumps was very difficult and it affected several bonding parameters such as bonding pressure, temperature, time, Cu bump diameter and so on. The bonding results were evaluated through the cross-sectional image of interconnection and the electrical continuity test of daisy chain and bump resistance using 4-point Kelvin structure. The long time reliability tests like thermal cycling test and 85/spl deg/C/85% test are now in progress after flip chip bonding and underfill dispensing." @default.
- W2540193419 created "2016-11-04" @default.
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- W2540193419 date "2006-03-21" @default.
- W2540193419 modified "2023-09-25" @default.
- W2540193419 title "Studies on Double-Layered Metal Bumps for Fine Pitch Flip Chip Applications" @default.
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- W2540193419 doi "https://doi.org/10.1109/emap.2005.1598242" @default.
- W2540193419 hasPublicationYear "2006" @default.
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