Hi,
I haven't directly done a layout with a BGA part yet. Is it possible to do a 400-pin or 500-pin+ BGA on 4-layers, or do I have to eat it and go to six?
As a follow-up, any reasonably cheap places in the US to do 4-layer and
6-layer prototypes? I've seen some that look good, but then follow up by saying "no step repeat" of the design...Finally, if there aren't any good places in the US, what about overseas, such as Taiwan?
I'm trying to avoid China for concern of pollution -- I doubt that many PCB factories there are following strict environmental laws and *I* don't want make things worse.
Thanks H.