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BQ21040: Do the SNAGU solder balls on BQ25155YFPR become lower in height post reflow?

Part Number: BQ21040


Tool/software:

Hi,

1st off, the Part number in the Part Number field is not the Part Number of interest.  Entering BQ2155YFPR was not being accepted.

I am a mechanical engineer working on a smart ring, and in some spaces even tens of microns get added into space calculations.  Is there a way to get some understanding of how a YFP Package would sit on an FPC's solder pads, post-reflow?  I could simply use the package height add in an estimate for solder thickness, but it seems like a solder ball will not only reduce in height, but also that being sperical that it won't simply "sit on top" of say a 50 micron solder thickness.  Any help is appreciated.  

And, yes, I am guessing this is the right place to ask!  Could easily need to be in a different forum, so, if that is the case, I'd like to know so I can direct this query appropriately.

Thanks,

Bob