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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References
M. Abtew and G. Selvaduray, Mater. Sci. Eng. 27, 95 (2000).
J. Glazer, J. Electron. Mater. 23, 673 (1994).
K. Zeng and K.N. Tu, Mater. Sci. Eng. 38, 55 (2002).
Y. Kamiya and H. Houma, Fujitsu 54, 154 (2003).
P. Harris, Solder. Surf. Mount Technol. 11, 46 (1999).
T. Shimozaki and M. Onishi, J. Jpn. Inst. Met. 42, 402 (1978).
T. Shimozaki and M. Onishi, J. Jpn. Inst. Met. 45, 1221 (1981).
K.H. Prakash and T. Shitharan, Acta Mater. 49, 2481 (2001).
S.-P. Yu and M.-C. Wang, J. Mater. Res. 16, 76 (2001).
C.-M. Chen and S.-W. Chen, J. Electron. Mater. 29, 1222 (2000).
M.Y. Chiu, S.S. Wang, and T.H. Chuang, J. Electron. Mater. 31, 494 (2002).
K.S. Kim, J.M. Yang, C.H. Yu, and H.J. Jeon, Trans. JIM 45, 721 (2004).
P.G. Kim, J.W. Jang, T.Y. Lee, and K.N. Tu, Jpn. J. Appl. Phys. 86, 6746 (1999).
C.H. Yu and K.S. Kim, Trans. JIM 43, 3234 (2002).
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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