Bu chance, Is there any CC added after test that requires a UV cure process?
Sent from my iPhone
On Nov 18, 2010, at 8:46 AM, Michelle <[log in to unmask]> wrote:
> No this is all No clean
>
>
>
> ----- Original Message ----
> From: David D. Hillman <[log in to unmask]>
> To: [log in to unmask]
> Sent: Thu, November 18, 2010 10:16:42 AM
> Subject: Re: [TN] Led Failures Please help
>
> Hi Michelle! Are you cleaning the LED assembly/components in any manner?
> LEDs do not play well with many cleaning processes or cleaning
> chemistries.
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
>
>
>
> Michelle Masaitis <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 11/18/2010 07:41 AM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> Michelle Masaitis <[log in to unmask]>
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> [TN] Led Failures Please help
>
>
>
>
>
>
> - the through-hole LED in question is made by company "EOI ", and their
> part number is "EOZ-ZARNCD0-DG " (s
> - according to the component spec sheet (enclosed), the maximum
> temperature for the component is 260℃
> - the maximum temp and wave contact time we initially used is 249℃ ,
> 4-6
> seconds. We saw some defects after first pass, usually about .2%, but one
>
> month as high as 1.5%. After successful testing, there were then some
> latent defects that occurred at our customer or their end customer. The
> defects are erratic, sometimes the LEDs work, and sometimes they don't
> - the supplier recommended a lower temperature and shorter exposure
> profile
> so we used SAC305 solder with maximum temp of 244.4℃ and 3 seconds.
> There
> were no defects after first pass and testing, but again we had some latent
>
> defects occur at customer
> - for reference, we run many similar LED from other manufacturers
> (OSRAM&Lumiled, also spec at 260℃) at temperatures of 251℃ and 4-7
> seconds
> and see no such problems.
>
> Attached is a wave profile.
>
> Please let me know if you seen a similar issue and what caused it.
>
>
> Thanks
>
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