another dendrite question

Aug 17, 2006 1 Replies

I understand that to prevent silver migration between pads on a circuit board with a silver immersion finish it is necessary to have solder mask between the pads. Is this true? How much solder mask?



Does anyone have a good reference on the subject? I think immersion silver is very common these days due to the lead free thing.



thanks,



Jeff_M


In message , dated Thu,

17 Aug 2006, Jeff_M writes

I've seen silver migrate across 2.5 mm of a glass seal, with 5 V driving it. Enough conductivity for the affected device to show as a short-circuit.

OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

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