> The lower limit for the lower end board houses (in terms of costs not
> quality) tends to be around 15 mil. I don't think you can do any of
> these BGAs using 15 mil vias, so the truly low end houses are likely
> out anyway. It is important to choose a *good* fab house. I have
> found quality to vary a *lot*.


Aye, I'd assumed a 'proper' board house, not a pile em high outfit like
PCB pool etc (although I've always had good results using pcb pool for lower
tech boards).


Nial.