[SI-LIST] Re: PCB CAF

  • From: alan.hussey@xxxxxxxxxxxx
  • To: CurtM@xxxxxxxxxxx, "jpritchard@xxxxxxxxxxxx" <jpritchard@xxxxxxxxxxxx>, si-list <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 10 Jan 2017 14:00:15 -0800

Hi Jason,
    A FAB house expert explained to me that you have the CAF issue with
specified DRC rules or not. The voltage is more about how long the
validation takes to expose the issue.
There are 2 issues, 1) first is the drill process tears the glass to epoxy
adhesion up to a given depth from the drill hole leading to 2 of these gaps
plus some margin as DRC rule
separating the drill holes. 2) some glass suppliers may have hollow threads
so just make sure to avoid that.

Alan



From:   Curt McNamara <CurtM@xxxxxxxxxxx>
To:     "jpritchard@xxxxxxxxxxxx" <jpritchard@xxxxxxxxxxxx>, si-list
            <si-list@xxxxxxxxxxxxx>
Date:   01/10/2017 01:30 PM
Subject:        [SI-LIST] Re: PCB CAF
Sent by:        si-list-bounce@xxxxxxxxxxxxx



https://urldefense.proofpoint.com/v2/url?u=http-3A__www.parkelectro.com_parkelectro_images_CAF-2520Article.pdf&d=DgIDAg&c=ijRx0Ge2I3tmMCg6fWPv0Q&r=XxBtMvlEpoBYhl7WlOFMouNYhDzKs8gj24haBktksZ4&m3UK0hK1Vqe1R14jwY0ZpQYBOvzXGdfrAfw20gtdmKE&s=WIfRAWpkVFPhncnxFuWX6AZnwP-Fqx481_oWb25rxDQ&e

This is a reasonable overview and has a graph (Fig 3) indicating the effect
of voltage.

                             Curt

Curt McNamara, P.E.
Engineering Consultant
North Pole Engineering
www.npe-inc.com

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Jason Pritchard
Sent: Tuesday, January 10, 2017 3:01 PM
To: si-list <si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] PCB CAF

Hi All,
Does anyone know if CAF is a concern for low voltage signals? When I talk
to the PCB house they point me to test reports of the material that were
completed at 100VDC. I can't find anyone to adequately explain to me if/why
voltage doesn't matter.

Suppose I had two 10 mil vias that were 15 mils apart wall to wall  (1
Signal, 1 Ground). The signal via carries a 1.2V signal.

Is this something that I need to worry about?

Thank-you for the great information over the years....


Jason Pritchard
Staff Engineer, Signal Integrity
Work: (508) 983-6483
Email: jpritchard@xxxxxxxxxxxx<mailto:jpritchard@xxxxxxxxxxxx>
[
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mellanox.com_img_news_media-5Fkit_logo_company-5Flogo-5Ftagline_Mellanox-5Ftagline-5Flogo-5Fhorizontal.jpg&d=DgIDAg&c=ijRx0Ge2I3tmMCg6fWPv0Q&r=XxBtMvlEpoBYhl7WlOFMouNYhDzKs8gj24haBktksZ4&m3UK0hK1Vqe1R14jwY0ZpQYBOvzXGdfrAfw20gtdmKE&s=IOBQpQA6Z0iTEtbGJ-oBUzEpu3TijaRtwGYx5_Ydt8E&e
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