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The key technology challenges and solutions in the packaging and assembly of large dies and/or fine pitch on organic substrates for both the 40 and 28 nm technology nodes are reported. Both eutectic PbSn, Pb-free solders, and Cu pillar bumps were used in the flip chip packages. The key challenge of chip-package-integrations (CPI) due to the use of fragile extreme low-k (ELK) dielectric materials in...
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