I suspect the shaking just dislodged the component, and did not necessarily
break of the 'filament'. The pressure from the pick and place head would
surely just flatten the filament, which would presumably then reflow with
the solder paste.
Best regards,
Leo
Leo M. Higgins III, Ph.D.
Vice President Technical Support Operations
ASAT, Inc.
3755 Capital of Texas Highway, Suite 100
Austin, Texas 78704
ph 512-383-4593
fx 512-383-1590
[log in to unmask]
www.asat.com
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Gary Camac
Sent: Friday, November 18, 2005 3:51 PM
To: [log in to unmask]
Subject: Re: [TN] Tin whiskers on 0402's in the reel.
I do not have that capability. And, since we haven't had a mis-pick since
vibrating the reel, I feel the evidence may be destroyed.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Friday, November 18, 2005 3:02 PM
To: [log in to unmask]
Subject: Re: [TN] Tin whiskers on 0402's in the reel.
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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