24-02-2010, 08:47 PM
i need full report of wafer bumping
24-02-2010, 08:47 PM
i need full report of wafer bumping
25-02-2010, 06:35 PM
Wafer bumping services are offered as a preparatory step for flip-chip bonding or as bumping
service alone. The types of solder bumping available include high lead solder, eutectic solder and lead free solder. Lead free bump, which is composed of tin-silver alloy, can meet the WEEE directives. Additionally, it can eliminate alpha particle sources.This service is currently offered for 6and 8wafers, and soon 12" wafers. About 11,000 bumps on a die with 120µm bump pitch with lead free solder, and a 100µm bump pitch. Wafer-bump Deposition: Evaporation, stencil printing, and plating are the three most com- mon technologies used for depos- iting the wafer bump. In stencil printing, solder paste is printed on to the UBM by screening it through a stencil which contains apertures that align with the wafer bond pads. Then The solder paste is trans- ferred to the bond pads by pushing a bead of solder across the stencil. Evaporation has the drawback that it has for UBM. High costs and low through- put limit the use of evaporation for bump deposition in high-volume manufacturing. -Electroplating can accommodate tight bump pitches and give high yield. It is the most versatile process, relative to bump size, pitch, and geometry, and is increasingly used in wafer bumping. Horizontal fountain-cell and vertical rack plating tools architectures have been used for these methods. Vertical plating tools have a capacity advantage over horizontal plating tools, particularly for 300-mm wafers. The horizontal architecture includes much of the process control and ancillary equipment, such as chemical delivery, re- sulting in a high level of tool complexity and cost-of-ownership. Full report: wafer-bumping.pdf (Size: 496.19 KB / Downloads: 126) Try this link too: http://dom.semiweb/wFiles.nsf/Lookup/STDEU04-FMWG-03/$file/STDEU04-FMWG-03.pdf |
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