[PCB_FORUM] Re: micro vias or thin traces

I have done a few of these, but never without microvias.  5 mil laser
drills.  pads anywhere from 10 to 13 mils.  
 

Patrick Westfeldt, Jr. 
720-406-0887 

 

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Subject: [PCB_FORUM] micro vias or thin traces


questions i asked our board house, but i didn't get a response. I ordered
the IPC book but it hasn't arrived. Getting desperated. Right now i need to
know if board houses can do 2.6 mil traces.   
 
I'm trying to lay-out a board using a .5mm pitch BGA. The pads are .012 mils
which leaves about .008 mils of space between pads. We are using the two
outside row so we could do this without vias, but that would mean 2.6 mil
trace with 2.6 mil space from pads. I would like to know what kind of
technology we can apply to this dense package.
If i can't use traces i will use 12 mil pad with 8 mil drill, is this
possible? Can your shop do micro via's? If so, can i get dimensions to use
for creating pads.
 
Thanks for any input. 
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