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Effect of microstructural evolution on electrical property of the Sn–Ag–Cu solder balls joined with Sn–Zn–Bi paste

Published online by Cambridge University Press:  03 March 2011

Po-Cheng Shih  and
Kwang-Lung Lin
Po-Cheng Shih*
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan 701, Republic of China
Kwang-Lung Lin
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan 701, Republic of China
*
a)Address all correspondence to this author. e-mail: pj.shih@msa.hinet.net
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Abstract

Sn–8Zn–3Bi solder paste and Sn–3.2Ag–0.5Cu solder balls were reflowed simultaneously on Cu/Ni/Au metallized ball grid array (BGA) substrates. The correlation between microstructural evolution and the electrical resistance of the joints under various testing conditions of reflow cycles and heat treatment was investigated. The electrical resistance of the Sn–Ag–Cu joints without Sn–Zn–Bi was also conducted for comparison. The average resistance values of Sn–Ag–Cu and Sn–Ag–Cu/Sn–Zn–Bi samples changed, respectively, from 7.1 (single reflow) to 7.3 (10 cycles) mΩ and from 7.2 (single reflow) to 7.6 (10 cycles) mΩ. Furthermore, the average resistance values of Sn–Ag–Cu and Sn–Ag–Cu/Sn–Zn–Bi samples changed, respectively, from 7.1 (aging 0 h) to 7.8 (aging 1000 h) mΩ and from 7.2 (aging 0 h) to 7.9 (aging 1000 h) mΩ. It was also noticeable that the average resistance values of Sn–Ag–Cu/Sn–Zn–Bi samples were higher than those of Sn–Ag–Cu samples in each specified testing condition. The possible reasons for the greater resistance exhibited by the Sn–Zn–Bi incorporated joints were discussed.

Keywords

AgingElectrical propertiesLayered

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Type
Articles
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Journal of Materials Research , Volume 20 , Issue 10 , October 2005 , pp. 2854 - 2865
Copyright
Copyright © Materials Research Society 2005

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