[SI-LIST] Re: Low inductance chip capacitor(LICC)
- From: "Michael Khusid" <mkhusid@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 18 Oct 2002 17:09:29 -0400
Larry,
I totally agree with you. I've encountered problems with the 0306 cap
supply, but I had more luck getting 0508 parts. Although they occupy
somewhat more space than 0306/0603s, their ESL is much lower than
0805/0603 caps and the total mounting inductance can be kept under
control as well.
Michael Khusid
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Larry Smith
Sent: Friday, October 18, 2002 5:05 PM
To: leeritchey@xxxxxxxxxxxxx; Perry.Qu@xxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Low inductance chip capacitor(LICC)
Hmmm. This is a very interesting thread. We have also had trouble
getting samples of reverse geometry (0306) capacitors from the supplier
in question. We have been able to obtain samples of these same caps
from
Murata, I suggest you try them.
Low inductance, reverse geometry capacitors are only useful if you can
get the mounting inductance (PCB structures) down less than the
inductance of the RG cap. With careful design, we have been able to
achieve PCB mounting inductance of about 200 pH, including the pads,
vias and PCB power planes. At that level, RG caps make a lot of
sense.
I am hoping that the rest of the industry comes to see the value of RG
caps so that there will be a ready supply of them.
regards,
Larry Smith
Sun Microsystems.
> Delivered-To: si-list@xxxxxxxxxxxxx
> Date: 18 Oct 2002 16:39:13 -0400
> From: "Perry Qu" <Perry.Qu@xxxxxxxxxxx>
> To: "Ritchey Lee" <leeritchey@xxxxxxxxxxxxx>
> Cc: "si-list" <si-list@xxxxxxxxxxxxx>
> X-Accept-Language: en
> MIME-Version: 1.0
> Subject: [SI-LIST] Re: Low inductance chip capacitor(LICC)
> Content-Transfer-Encoding: 8bit
> X-archive-position: 4340
> X-ecartis-version: Ecartis v1.0.0
> X-original-sender: Perry.Qu@xxxxxxxxxxx
> X-list: si-list
>
>
> Lee:
>
> Thanks for your comment. That's what I'm thinking of. It seems that
the
> inductance coming from vias/stubs associated with cap is the major
contributor
> of ESL, compared with the portion from cap packaging.
>
> BTW, when you say "0306" you mean "0603", right ? Because "0306"
sounds like
> one type of LICC, where they align terminals along the long side of
cap to
> increase mutual coupling between terminals.
>
> Regards
>
> Perry
>
> Ritchey Lee wrote:
>
> > Perry,
> >
> > By the time you add in the mounting inductance, the reduction in
inductance
> > that the low inductance capacitor provides is lost. You are better
off us
> > in 0306 capacitors and relying on the plane capacitance of the PCB
to
> > provide for the high frequencies.
> >
> > Lee
> >
> > Perry Qu wrote:
> >
> > > Hi, everyone:
> > >
> > > I would like to know if anyone used low inductance capacitor such
as the
> > > one listed on AVX web site:
> > >
> > > http://www.avxcorp.com/docs/Catalogs/licc.pdf
> > >
> > > Does it really help to bring down the total ESL of cap ? Any
associated
> > > problems that we should watch out ?
> > >
> > > Thanks
> > >
> > > Perry
> > >
> > > --
> > > Perry Qu
> > >
> > > Product Integrity | 600 March Road
> > > Alcatel Canada | Ottawa, ON K2K 2E6, Canada
> > >
> > > DID: (613) 7846720 | FAX: (613) 5993642
> > >
> > > ------------------------------------------------------------------
> > > 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 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
>
> --
> Perry Qu
>
> Product Integrity | 600 March Road
> Alcatel Canada | Ottawa, ON K2K 2E6, Canada
>
> DID: (613) 7846720 | FAX: (613) 5993642
>
>
> ------------------------------------------------------------------
> 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 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
>
>
------------------------------------------------------------------
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 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
------------------------------------------------------------------
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 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:
