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In this study, the board level reliability of WLP at 0.25mm pitch has been evaluated by employing board level reliability test following JEDEC include thermal cycling, drop shock and cyclic 4-point bend tests to verify the performance of shrunk bump size. The WLP test vehicle has been designed with 4-layer stack up structure, 4.0 × 4.0 mm die size and 15 × 15 ball array. The shrunk bumps of test vehicles...
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