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From [log in to unmask] Fri Nov 8 12: |
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Rolf,
EDN 9/5/79 page 59 - Technology News
EDN 4/20/80 page 63 - Technology News
George Franck
On Nov 7, 3:26pm, Rolf Ehrat wrote:
> Subject: Wisker growth on PCBs
> Dear Colleagues,
>
> I am writing with respect to a 4 layer (mixed technology) PCB with the
> following layering:
>
> Component side traces
> Ground plane
> Vcc plane
> Solder side traces.
>
> We have, on three occasion, had boards burn out after the boards were
in
> service for some time. The burns are between the 12V battery traces
and
> other traces/planes. The 12V is fused with a 1.5V quick fuse. The post
> mortem on one occasion indicated that the short occurred between a
component
> pin and the ground plane. The other cases are not so clear as the
short
> occurred on an inside layer along an edge of the board. The spacing
> generally is 0.015".
>
> I recall to have read in the past about wisker growth. Can anyone
point me
> to such literature, preferably in EDN, Electronic Design. Any help
would be
> appreciated.
>
>
> Rolf Ehrat, Sen. Des. Eng. Tel. (905) 669-2280 ext. 320
> Scintrex Ltd. FAX (905) 669-5132
> 222 Snidercroft Rd.
> Concord, Ont.
> L4K 1B5
>
>
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>-- End of excerpt from Rolf Ehrat
--
George Franck Jr
Raytheon E-Systems
Product Assurance Engineer
Falls Church Va
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