ViaSystems purchased most of the North American higher technology
fabrication shops over the past decade (Merix, DDI Milpitas to name a few).
They have since been purchased by TTM Technologies.
Have always received great quality product and technical support for
designs with challenging technology from the Milpitas shop.
It does sound like any reputable fabricator employing LDI processing should
be able to resolve your issues.
Hth,
Dave
On Tue, Feb 2, 2016 at 1:05 PM, Bartlett, Josiah <
josiah.bartlett@xxxxxxxxxxxxx> wrote:
I've used Sanmina, Compunetics, and ViaSystems for circuit boards with
chip on board kind of tolerance. I've had upsides and downsides to each,
using both laser drilled and silkscreen solder masks. You are going to need
to work closely with the vendor to discuss materials, design rules, and
specifics of their process to make sure you can do what you really want,
and it may take more than one turn and one batch to get there. It is best
to have them review artwork you already have and suggest changes that they
would need to accommodate your spacing and soldermask. Some of it will also
depend on how you plan to assemble your components to the board, so if you
are doing solder balls make sure your solder ball engineer gets involved to
figure out both thermal profile and pad size to soldermask aperture.
You need to consider more than just the pads and solder mask when doing
this kind of work. If you need to escape the pads with vias, there is some
interaction between the vias and the pad and solder mask, and to a great
extent the stackup and the equipment the vendor uses determines if they can
do the same tolerances with the pad with a via nearby as without.
There's kind of a big reason why there is a jump between standard process
control and the level of tolerances you need... the equipment, sales
volume, and expertise needed to make good product are all more scarce and
expensive.
Regards,
Josiah Bartlett
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Alexander Akulin (PCBtech)
Sent: Tuesday, February 02, 2016 10:41 AM
To: Chris.Jakubiec@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Recommendations for PCB fabs - tight tolerance
Hi Chris,
I would recommend you the Ellwest KG PCB supplier company
http://www.ellwest-pcb.com/ Mr. Udodov contact is:
viatcheslav.udodov@xxxxxxxxxxx
They offer very special PCBs for us since year 2003, always in time, with
fine lines and small vias, up to 30 layers, and with strict requirements to
the soldermask tolerance.
And they always help with stack-up design, special materials, etc. - they
are really professional guys in PCB supply.
I think we purchased more than 1000 different multilayer part numbers,
from 2 to 200 pcs each, since that time.
As I know they are the official distributor of several advanced PCB
factories which are located in Asia and Europe, so they could recommend you
a right one.
------------------------------------------------------------------------
Best wishes, Alex
*PCB technology* <http://www.pcbtech.ru> - EMS services & PCB
design/simulation *PCB SOFT* <http://www.pcbsoft.ru> - the channel
partner of Cadence Design Systems Inc.
02.02.2016 21:07, Jakubiec, Chris пиÑеÑ:
We are designing small PCB's to use as test fixtures for fine pitchwafer level chip-scale parts (WLCSP). Our current PCB fab seems to be
having issues with tolerance control of the pads and solder mask. Looking
for recommendations of PCB fabs that have very tight process control.
Thanks,
Chris
Efficient Power Conversion
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