Microvias and BGA Pads

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Inka_One

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Hey to you folks!

I wish to know if I could place microvias under a BGA pad.

What's the problems if I do that?

Best regards for all!
 

You can and I've seen it done.
Whether it's a good and advisable practice - probably not.

IMHO, there's a ball pitch to via diameter ratio below which the joint integrity becomes unreliable. In some cases - the ball may detach completley from the IC.
 

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