I kind of doubt that it would hurt part, but all parts are not created
equal, and there is a degree of consensus around that 2 degree number.
http://www.avxcorp.com/docs/Catalogs/cguide.pdfve

If the component was damaged by the process, you might not be able to
see it.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of d. terstegge
> Sent: Thursday, September 04, 2003 11:33 AM
> To: [log in to unmask]
> Subject: [TN] Preheat of ceramic chip capacitors
>
>
> 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 Celsius 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 chip capacitors ?
>
> Best regards,
>
> Daan Terstegge
> Thales Communications
> Unclassified mail
> Personal Website: http://www.smtinfo.net

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