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Influence of interfacial reaction layer on reliability of chip-scale package joint from using Sn-37Pb and Sn-8Zn-3Bi solder

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Abstract

The microstructure of Sn-37Pb and Sn-8Zn-3Bi solders and the full strength of these solders with an Au/Ni/Cu pad under isothermal aging conditions were investigated. The full strengths tended to decrease as the aging temperature and time increased, regardless of the properties of the solders. The Sn-8Zn-3Bi had higher full strength than Sn-37Pb. In the Sn-37Pb solder, Ni3Sn4 compounds and irregular-shaped Pb-rich phase were embedded in a β-Sn matrix. The Ni3Sn4 compounds were observed at the interface between the solder and pad. The microstructure of the as-reflowed Sn-8Zn-3Bi solder mainly consists of the β-Sn matrix scattered with Zn-rich phase. Zinc first reacted with Au and then was transformed to the AuZn compound. With aging, Ni5Zn21 compounds were formed at the Ni layer. Finally, a Ni5Zn21 phase, divided into three layers, was formed with column-shaped grains, and the thicknesses of the layers were changed.

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Yu, CH., Kim, KS., Kim, HI. et al. Influence of interfacial reaction layer on reliability of chip-scale package joint from using Sn-37Pb and Sn-8Zn-3Bi solder. J. Electron. Mater. 34, 161–167 (2005). https://doi.org/10.1007/s11664-005-0228-9

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  • DOI: https://doi.org/10.1007/s11664-005-0228-9

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