[SI-LIST] Re: 0306 Capacitors
- From: steve weir <weirsp@xxxxxxxxxx>
- To: jseeger@xxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 15 Mar 2004 10:37:30 -0800
Jeff, let's try this again. The issue under discussion was whether we
could lower inductance by increasing via ID. My point was that for the
very reasons you state, any increase in the via ID will force us into an
increase in the OD, and hence the inductance goes up. If there was excess
margin to begin with, it just means we placed the via suboptimally with
excess inductance.
Regards,
Steve.
At 01:11 PM 3/15/2004 -0500, Jeff Seeger wrote:
>steve weir wrote:
> >
> > snip <
> > Is there a good reason that we would not track ID and OD at the
> > economic sweet spot of our fabrication capability?
> >
>
> Okay, now you guys are scaring me.
>
> We do realize that the .010" hole can and will appear at
> any location within that .020" pad, right? Vendors may
> even seek to allow breakout (drill partially beyond .020"
> circle) particularly on a volume run and/or large panel.
>
> And since I just have to throw this into the soup, please
> recall thru via pads must remain distinct from the capaci-
> tor land, with a soldermask dam, at worst case. With the
> fine point being put on this analysis, fabrication toler-
> ances appear quite large.
>
> Cheers,
>--
>
> Jeff Seeger Applied CAD Knowledge Inc
> Chief Technical Officer Tyngsboro, MA 01879
> jseeger "at" appliedcad "dot" com 978 649 9800
>------------------------------------------------------------------
>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 FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl
>
>List technical documents are available at:
> http://www.si-list.org
>
>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 FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl
List technical documents are available at:
http://www.si-list.org
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:
