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Date: | Tue, 14 Aug 2018 18:49:19 +0000 |
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Wayne:
We recommend keeping larger size ceramic style parts at least .200" from the PCB edge where depanelization is required. For V-Scores, we ask that a route in the breakaway be added to minimizes the stresses. For mouse-bites, we like to see the tabs as far as possible from the edge parts.
Regards,
Steve Vargas
Lockheed Martin RMS-Rotary and Mission Systems
Polaris Contract Mfg.
15 Barnabas Rd
Marion, MA 02738
774-553-6192
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-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Wayne Thayer
Sent: Tuesday, August 14, 2018 2:36 PM
To: [log in to unmask]
Subject: EXTERNAL: Re: [TN] MLCC spacing/orientation to V-score or Perforated Tabs
That doesn't give me "warm fuzzies"! I have personally seen pizza wheels result in a broken cap 0.125" away (no visual cue, 10% of parts had the problem). Leaving a potential reliability issue to each pcb assembly house is a real problem for me. And not just me, for all of us who use PCBs. I did find a paper from Kemet which touched on the issue, but not in any clear, useful guideline kind of way.
Wayne Thayer
On Tue, Aug 14, 2018 at 11:03 AM, John Maxwell <[log in to unmask]> wrote:
> Depend on vendors recommendations for best results
>
> Sent from my iPad
>
> > On Aug 14, 2018, at 1:24 PM, Wayne Thayer <[log in to unmask]>
> wrote:
> >
> > Hi-
> >
> > Is there an IPC standard for distances from components to board edge
> > for the V-score or perforated tab techniques? I've been able to find
> > several recommendations from manufacturers, but I couldn't find the
> > applicable
> IPC
> > doc.
> >
> > Wayne Thayer
>
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