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Acta Metall Sin  2013, Vol. 49 Issue (7): 831-837    DOI: 10.3724/SP.J.1037.2012.00759
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RESEARCH ON MICROSTRUCTURE OF Pb-FREE BGA SOLDER JOINT ASSEMBLED WITH Sn-Pb SOLDER DURING ISOTHERMAL AGING
HANG Chunjin, TIAN Yanhong,ZHAO Xin, WANG Chunqing
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001
Cite this article: 

HANG Chunjin, TIAN Yanhong,ZHAO Xin, WANG Chunqing. RESEARCH ON MICROSTRUCTURE OF Pb-FREE BGA SOLDER JOINT ASSEMBLED WITH Sn-Pb SOLDER DURING ISOTHERMAL AGING. Acta Metall Sin, 2013, 49(7): 831-837.

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Abstract  

The Pb-free plastic encapsulated ball grid array (BGA) packages have been assembled to printed-circuit boards (PCBs) with SnPb solder material using reflowing process. Isothermal aging with 4, 9, 16 and 25 d was applied to the assembled packages and the microstructures of the solder joints in the BGA packages were observed using SEM. The electrical performance test was conducted before and after different periods of isothermal aging. The result showed that there were no failure in the BGA devices. It was found that intermetallic compounds (IMCs) in the PCB substrate side were Cu3Sn and Cu6Sn5 while Ni-Cu-Sn ternary compounds were in BGA substrate side. The thicknesses of IMCs on both sides increased with the time of isothermal aging. The IMC growth rate at PCB side was significantly greater than that at BGA substrate side. The aggregation of Pb-rich phase, cracks along substrate, broken IMCs, and voids, which have negative effects on the joints reliability, were observed in a few solder joints after long-term isothermal aging process.

Key words:  mixed solder joint      isothermal aging      microstructure, reliability     
Received:  20 December 2012     

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00759     OR     https://www.ams.org.cn/EN/Y2013/V49/I7/831

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