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Fri, 18 Nov 2005 16:01:36 -0500 |
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Gary,
could you post some pictures? It would be interesting to see the one with the filament on it.
Thanks,
Ioan
> -----Original Message-----
> From: TechNet [SMTP:[log in to unmask]] On Behalf Of Gary Camac
> Sent: Friday, November 18, 2005 3:57 PM
> To: [log in to unmask]
> Subject: [TN] Tin whiskers on 0402's in the reel.
>
> Good afternoon,
>
>
>
> We have had a problem today with a reel of 0402 resistors where the
> placement machine would not pick some of the parts out of the tape (paper).
> A part I examined would not fall out of the pocket when the feeder was
> turned upside down. I examine the part sitting in the pocket and it
> appeared to be jammed into one corner. After some tapping on the feeder the
> part dislodged. When I examined the part under a microscope, I noticed a
> filament attached to the bottom of the part starting at the corner of the
> electrode. The following part in the tape would, likewise, not fall out
> until persuaded. This part fell into my hand and when I examined it under
> the scope I could see a filament lying beside it in my palm.
>
>
>
> These parts are a 2002 date code. Tin whisker? Anyone seen this before?
>
>
>
> I took the reel on components to our environmental test lab, bolted it to
> the sinusoidal vibration table and shook for about a minute. We then
> reinstalled the reel on the placement machine and the picking problem went
> away. Interesting stuff for a Friday afternoon.
>
>
>
> Gary Camac
>
> Senior Mfg. Eng.
>
> Dickey-john Corp.
>
>
>
>
>
>
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