Yes, very common, but that's not to say it's the best way. Try finding an
open circuit via when there's a component over either side of it. Not common
but it does happen.
As for the autorouter, it does all sorts of weird and worrying things.

> -----Original Message-----
> From: Dwight Harm [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, 21 February 2002 2:17 PM
> To: Protel EDA Forum
> Subject: Re: [PEDA] how does smt work ??
> 
> 
> I'm relatively new at PCB layout, so I'd like to verify -- aren't
> under-the-component vias fairly common nowadays, particularly with
> fine-pitch ICs and BGAs?  The autorouter puts 'em there all 
> the time, so it
> MUST be ok! ;)
> 
> > -----Original Message-----
> > From: Thomas [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, February 20, 2002 3:19 PM
> >
> <snip>
> > The reason you may not notice the vias is that they may be 
> tented (covered
> > with solder mask) or under the component (bad design practice).
> 

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