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Double reflowing BGA's

#26012

Double reflowing BGA's | 10 October, 2003

Does anyone have any data about the dangers of reflowing BGA's twice? I have a customer that is concearned about cracking in the intermetallic layer after the second pass. Thanks in advance.

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MA/NY DDave

#26013

Double reflowing BGA's | 10 October, 2003

Hi SMTAnet, SMTnet,

I am pretty sure recently I heard and read a report with them simply reflowed with an improvement in strengths from a slowly degrading strength. I can't find it quick and don't remember all the caveats like maybe an underfill phenonomen.

If you plan to take them off completely and reapply them then I don't believe what I remember applies.

Do some R&D on Flip Chip or BGA.

YiEngr, MA/NY DDave

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