Hot Tear/Shirnk Hole>Will it happen on BGA joint ??

Dear All,

In order to understand the issue, pls review the photo in the attached file.

Thanks, Sean

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We agree that the squigglie part of the section of the BGA ball looks like something other than 'hot tear.' We'd guess that it is an inclusion, but it could be a sectioning defect, as you say.

We agree that the majority of occurances of hot tear are seen in PTH solder connections, but it is also seen in BGA solder connections.

For more on hot tear, look here: http://books.google.com/books?id=y2y4Y9ZPpYkC&pg=PA109&lpg=PA109&dq=hot+tear+lead+free&source=web&ots=6tJO93lCcR&sig=VsyMtAOD6Zs-K7hy0MzEjJI3iBQ&hl=en&sa=X&oi=book_result&resnum=7&ct=result#PPA107,M1

It's amazing to us that the rocket scientists at IPC would give a defect like hot tear a pass. It looks like they're trying too hard to make PbF work. They must be justifying calling hot tear acceptable because it is most prevalent in solder connections with high mass. There's a lot of redundancy in that type of a connection. So, that must make it acceptable. We don't wish they're on the plane, but insist they go the each funeral and explain their decision to each family.

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