What is your minimum drill size? We are using 12pad 5drill from L1-L2, L2-L3. Regards, -oscar On 5/19/08, Douglas Stanley <dstanley@xxxxxxxxxxxx> wrote: > > We do boards every day that are 3 and 3 with microvias in pad. The board > shops completely fill the hole with copper and then plate over it. They then > planerize the copper so the pad is flat. I think it's pretty standard > nowadays. We simply add a note to the fab drawing to plate the microvia > closed and to "repad" so the surface is flat. > > > Douglas G. Stanley > PC Board Designer, Sr. Staff > Broadcom Corporation- Irvine, CA > dstanley@xxxxxxxxxxxx > (949) 926-5889 > > > ------------------------------ > *From:* icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto: > icu-pcb-forum-bounce@xxxxxxxxxxxxx] *On Behalf Of *O Migs > *Sent:* Monday, May 19, 2008 9:58 AM > *To:* icu-pcb-forum@xxxxxxxxxxxxx > *Subject:* [PCB_FORUM] copper filling of micro vias. > > Hi All, > > Does anyone know the requirements to copper fill or epoxy fill a microvia? > microvia is via in pad. Is there an alternative? > > I have a design that requires a fanout of 3.5 mil trace and 3mil airgap out > of a finepitch bga. > > -oscar > > ____________________________________________________ > oscar miguelino | lead pcb engineer | *OQO*, inc. > 583 shotwell street | san francisco, ca 94110 > > *(this message constitutes confidential information proprietary to OQO, > Inc.)* > >