As far as I understand, conformal coating the board will not necessarily
prevent it happening.

We had a demonstration session from a very knowledgeable guy from
Concoat last week
and I seem to remember that the original contamination just gets trapped
under the coating
and causes similar problems.

The board has to be so, so clean before its coated to prevent the
contamination....

Or something like that....



>-----Original Message-----
>From:  Nancy Trumbull [SMTP:[log in to unmask]]
>Sent:  Friday, October 01, 1999 3:11 PM
>To:    [log in to unmask]
>Subject:       [TN] Electrical Migration
>
>Hi Every One.
>
>I need information on Migration
>
>Question
>1.  What will cause Electrical Migration
>
>Reason :
>
>We are seeing Dendritic Migration between components
>
>As of now we are applying conformal coating trying to stop the migration.
>
>Question:
>
>1. Is there a rework to prevent this condition.
>
>2.  Any study or data out there on reliability as far as using this method
>to stop the migration.
>
>
>Any information at all will be greatly appreciated.
>If more information is needed please ask.  This is all I know as of now
>I will do my best to get what ever is needed.
>
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