The reliability of fine pitch Sn–3.8Ag–0.7Cu flip chip solder joints with three different pads, i.e., bare pads, pads with solder masks, and pads with microvia, on printed circuit boards (PCBs) was studied through thermal cycling. After assembly, intermetallics (IMCs) formed both in the bulk solder and at the interfaces due to the immersion-Au finish on the PCB side. The IMCs formed in the solder joints on the pads with microvia were more abundant than those formed in the solder joints on the pads without microvia. The results showed that the solder joints on the pads with a microvia had poor reliability due to the insufficient solder volume and the formation of large amounts of IMCs. The main crack initiation position was the corner of solder joint at the chip side. For the pads with microvia, the main location of failure was at the /solder interface on the chip side, and for the solder joints on bare pads and pads with solder mask, the possible failure location was in the bulk solder.
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March 2008
Research Papers
Reliability of Fine Pitch Sn–3.8Ag–0.7Cu Flip Chip Solder Joints With Different Connection Pads on PCB
Dezhi Li,
Dezhi Li
Wolfson School of Mechanical and Manufacturing Engineering,
e-mail: d.li@lboro.ac.uk
Loughborough University
, Loughborough, Leicestershire LE11 3TU, United Kingdom
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Changqing Liu,
Changqing Liu
Wolfson School of Mechanical and Manufacturing Engineering,
Loughborough University
, Loughborough, Leicestershire LE11 3TU, United Kingdom
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Paul P. Conway
Paul P. Conway
Wolfson School of Mechanical and Manufacturing Engineering,
Loughborough University
, Loughborough, Leicestershire LE11 3TU, United Kingdom
Search for other works by this author on:
Dezhi Li
Wolfson School of Mechanical and Manufacturing Engineering,
Loughborough University
, Loughborough, Leicestershire LE11 3TU, United Kingdome-mail: d.li@lboro.ac.uk
Changqing Liu
Wolfson School of Mechanical and Manufacturing Engineering,
Loughborough University
, Loughborough, Leicestershire LE11 3TU, United Kingdom
Paul P. Conway
Wolfson School of Mechanical and Manufacturing Engineering,
Loughborough University
, Loughborough, Leicestershire LE11 3TU, United KingdomJ. Electron. Packag. Mar 2008, 130(1): 011005 (7 pages)
Published Online: January 31, 2008
Article history
Received:
January 5, 2007
Revised:
July 12, 2007
Published:
January 31, 2008
Citation
Li, D., Liu, C., and Conway, P. P. (January 31, 2008). "Reliability of Fine Pitch Sn–3.8Ag–0.7Cu Flip Chip Solder Joints With Different Connection Pads on PCB." ASME. J. Electron. Packag. March 2008; 130(1): 011005. https://doi.org/10.1115/1.2837522
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