Hi Technet,

I just saw a specification for the soldering profile for a simple
0805-sized ceramic chipcapacitor. It mentions a maximum preheat ramp,
both for wave and for reflow soldering, of 2 degrees Celcius per second.

In the beginning of the slope, for some of our products, we go slightly
higher than this.
One of our customers now thinks that the preheat ramp being steeper
than the component suppliers specification must be the reason for
malfunctioning of this specific part.

I won't annoy you with all the discussions we had and the
investigations that we've done, I just hope to get an answer to the
following question: is it possible that a preheat ramp of 3 °C/s results
in failures (but without any visible damage) of 0805 ceramic
chipcapacitors ?

Best regards,

Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net

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