Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


What causes Bga corners to lift during reflow

mantis

#25876

What causes Bga corners to lift during reflow | 27 September, 2003

All, I was wondering what causes the corners of a bga to lift during reflow process.Now just to clarify i have been running this one particular product for 4 years and i have the process and reflow profile down to a tee.But recently i have witnessed fallout at ICT due to shorts under the bga caused by the corners lifting during reflow.Since i only have one supplier for this part and i have been using them for years what error has been introduced to this part to cause this problem. Any insights would be gratefully received, Mantis

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Sam

#25880

What causes Bga corners to lift during reflow | 29 September, 2003

Hi Mantis.

Has there been any changes in the BGA itself? One of our BGAs changed to a newer type, and after that we had problems with corner lifting. In that case problem was BGA's structure, there was mismatch in TCE between BGA's substrate and molding compound. There was nothing to be done, but change the BGA for that older type again, since the problem was in the BGA itself, not in our proces.

br, Sam

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#25883

What causes Bga corners to lift during reflow | 29 September, 2003

mantis

#25884

What causes Bga corners to lift during reflow | 29 September, 2003

DaveF, Thanks for the link very helpful and informative. I have got in contact with our part vendor on recomendations. Regards, Mantis

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Dean

#25893

What causes Bga corners to lift during reflow | 30 September, 2003

Have you verified the thermal profile recently? I would start there and verify your process has not shifted. It does happen.

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