[PCB_FORUM] Re: Allegro 0402 footprint for under a 1mm BGA?

Hi Kevin,

> I still stand by my first comment.
> Let the cm know what you are trying to accomplish and
> see if they can find the solution that both of
> you can work with. If they cannot then, in my opinion,
> you should go with what they say. If not there
> could be much suffering. Especially with something
> like an 0402 which could have hundreds of landing sites.
> If you reduce the chances of hitting or increase the
> chances of tombstoning by even 1% that could be
> very costly.

I’ve used 0402s under BGAs for quite a few designs (with another PCB layout
tool), with no problem, and with different CMs.  Though I appreciate your
input, I though I made it clear that I have the CM aspect of the issue well
in hand.  I’ve been interfacing with CMs for some 25+ years and am more than
able to handle that.

I was simply asking for other peoples inputs as to what they use (or have
seen, or what has worked for them) for footprints in this specific
situation.  I have “input” (and even some well done write-ups) from three
tier 1 CMs already.  That does not mean that their answer is the only
answer, and they fully understand that.

Austin


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