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

>