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A strain-controllable dynamic bending method on WLCSP has been proposed in this paper. In order to identify the principle factor among the effects of stiffness attributed by different board level structures, the 0.4 mm pitch WLCSP packages with Sn-4.0Ag-0.5Cu solder ball are used. This combination of WLCSP is considered to have the high stiffness in the structure. It is also shown that there are interactions...
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