another dendrite question

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

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Jeff_M
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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.

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John Woodgate

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