On 1/11/07, Alan B. Pearce <A.B.Pearce@rl.ac.uk> wrote:
> But any board house doing the normal multilayer FR4 type PCB should be able
> to do 10 thou track 10 thou space with ease, more likely 8/8 would be their
> minimum. It then becomes a matter of minimum annular rings and drill sizes
> they are prepared to use that determine component density.

Hi Alan,

8/8 mil is quite unusefull for 0.65 mm pitch BGA package. My question
was a precise one, based on my last work. 4/4 mil, 5 mil stacked
microvia in least three layers (better four) and 6 mil mechanical
drilling (blind vias) is a must.
Do you now any US PCB board house doing currently such boards ?

thx,
Vasile
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