[SI-LIST] Re: Does anyone use "buried capacitance" layers?
- From: "Riley, Andrew" <andrew.riley@xxxxxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 25 Jun 2008 11:11:59 -0700
Tom,
Twenty three licensed fabricators if I counted the dots in the PDF
correctly.=20
http://www.sanmina-sci.com/Solutions/pdfs/pcbres/BC%20Licensed_fab.pdf
Cheers!
Drew
=20
Andrew W. Riley III
Senior Designer
EADS North America Defense Test & Services
Irvine, CA. 92618
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Bill Wurst
Sent: Wednesday, June 25, 2008 10:34 AM
To: tom_cip_11551
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Does anyone use "buried capacitance" layers?
Tom,
An alternative to the Sanmina IP is C-Ply by 3M (see:
(http://tinyurl.com/4bw9oc)
and look for the Embedded Capacitor Material link at the bottom of the=20
page). This material can be used for either buried or embedded=20
applications. If you want a contact at 3M call or email:
Joel Peiffer
jspeiffer@xxxxxxx
651-575-1464
Two companies that have experience fabricating boards using this=20
material are:
Endicott Interconnect:
(http://www.eitny.com/)
and
Compunetics:
(http://www.compunetics.com/)
I'm know there are others.
I don't believe it is widely used as it drives the cost of the boards up
(from both material & yield perspective - the cost impact will depend on
your application). However, it is a viable technology. Istvan Novak=20
has written extensively on its use and advantages.
Best regards,
-Bill
/************************************
/ William C. Wurst, PE /
/ billw@xxxxxxxxxxx /
/ Advanced Electronic Concepts, LLC /
/ www.aec-lab.com /
************************************
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
tom_cip_11551 wrote:
> Hi,
>=20
> I first heard about buried capacitance (not to be confused with=20
> embedded capacitance) for power and ground, using thin dialiectrics,=20
> over 10 years ago, from the original papers that Hadco had published.=20
> I had thought that since the technology has been around for so long=20
> that most fab houses would be able to use it.
> =20
> I figured that my latest PCB, that is running signals at over 3 Gb/s,=20
> and has some limitations in terms of space for decoupling caps, would=20
> be a good candidate for a bured capacitance layer (two layers and a 2=20
> mil dialectric core). When I sent the board out for quote I was=20
> surprised to learn that only Sandmina Circuits "owns" the technology=20
> and very few other vendors have licensed it.
>=20
> So, I would like to know from the SI community at large, if this=20
> technology is widely used. If so, could I get the name of some=20
> alternate vendors that have licensed it?
>=20
> Also, what is the general consenus of the viability of buried=20
> capacitance (not embedded capacitance).
>=20
> Thank You
> Tom
> tom_cip_11551@xxxxxxxxxxx
>=20
>=20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at: =20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
