[PCB_FORUM] Re: copper filling of micro vias.
- From: "Douglas Stanley" <dstanley@xxxxxxxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Mon, 19 May 2008 15:25:49 -0700
We use a 5 mil drill and a 10 mil pad on both inner and outer layers.
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of O Migs
Sent: Monday, May 19, 2008 3:21 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: copper filling of micro vias.
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
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to OQO, Inc.)
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