The peak temp for the electrolytic caps is measured at the top of the
cap and is warmer than the solder joint. There are other devices that
are lower than 250C max temp. Tedious, but necessary to check each
part.
Just because the oven profiled with 1 unit at these temps, doesn't
mean the oven will maintain the temperature when fully loaded. There
is no margin on the 220 location.

On 12/13/11, Leland Woodall <[log in to unmask]> wrote:
> Chris,
>
> I'd begin with the profile recommendations given by my solder paste
> supplier.  Then I'd take into consideration the reflow specs for any
> temperature sensitive components, usually found to be small aluminum
> electrolytic capacitors.
>
> On a side note, if you're using SAC 305, a peak of 220 C is a bit low.  This
> is barely above the melting point.  Again, check the technical data sheets
> for your particular paste.
>
> Leland
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Christopher Young
> Sent: Tuesday, December 13, 2011 5:17 AM
> To: [log in to unmask]
> Subject: [TN] Thermal profile for lead free
>
> Hi all,
>
>
>
> Could you give me some data on ideal temperature against ramp time for lead
> free profile.
>
>
>
> We have a 8 zone oven with profiles as follows. Are they both ok from a
> solder process point.
>
>
>
> At reflow zone Temp is at 220 c - 240c max for 30secs on one product.
>
>
>
> Any help or thoughts on thermal profiling would be great.
>
>
>
> Regards
>
>
>
> Chris
>
>
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