[PCB_FORUM] Re: micro vias or thin traces

Thanks for the response from everyone. We found a board house who will drill 12 
mil pads with 8 mil drill and it will be via in pad technology. 
Sam 
 
-----Original Message-----
From: westfeldt <westfeldt_nbcd@xxxxxxxxx>
To: icu-pcb-forum@xxxxxxxxxxxxx
Sent: Fri, 31 Mar 2006 12:15:58 -0700
Subject: [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 
 




From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of sjchar3@xxxxxxxxxxxx
Sent: Friday, March 31, 2006 8:55 AM
To: icu-pcb-forum@xxxxxxxxxxxxx; icu-pcb-forum@xxxxxxxxxxxxx
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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