Chip Capacitor Uneven Surface

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Hi all, Anyone come across chip capacitor with 0402 size ... - Sep 28, 2009 by Sean

When does the uneven surface occur? * Incoming * Reflow *... - Sep 28, 2009 by davef

Hi Davef, This photo taken on field returned board. Prev... - Sep 29, 2009 by Sean

Sean, Is this the only chip component that exhibits this ... - Sep 29, 2009 by CL

Sean

#59997

Chip Capacitor Uneven Surface | 28 September, 2009

Hi all,

Anyone come across chip capacitor with 0402 size with appearance as shown in the attached file?? My customer claim that this appearance is not acceptable..Any idea in this case?

Rgds, Sean

Attachments:

Copy of Chip capacitor-Uneven surface.xls

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davef

#60008

Chip Capacitor Uneven Surface | 28 September, 2009

When does the uneven surface occur? * Incoming * Reflow * Cleaning * Wave soldering * Some other process, where?

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Sean

#60009

Chip Capacitor Uneven Surface | 29 September, 2009

Hi Davef,

This photo taken on field returned board. Previously, we never saw such thing..Perhaps, this could be escapee to the field. Anyway, what is the potential root cause at each stage of the process?

Thanks, Sean

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#60011

Chip Capacitor Uneven Surface | 29 September, 2009

Sean,

Is this the only chip component that exhibits this condition? Only one location or only one part number? What are you using for chemistry? (OA, No Clean) if the parts do not look like this when they leave, I would send a sample of an unprocessed part, one that had been mounted and then one returned from the field with this condition to be analyzed for contamination. This would tell you: 1) raw parts have some degree of contamination- supplier issue 2) Parts have contamination after processing- internal issue 3) Parts are being contaminated after shipment-customer issue.

There are many parameters that need to be looked at. Process temps, chemistry, cleaning, etc. This becomed more focused if the problem applies to one part, one location or all chip components.

Please let us know how you are making out.

Thanks

Chris

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