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I don't know the thermal characteristics of solder mask, but leaving the ground
plane under the device unmasked will definitely help. You will need intimate
contact, though. Since air is a very poor conductor, a mil of air gap might as
well be a mile. You might need a thermal adhesive underneath to help dissipate
the heat.
Jim Marsico
(516) 595-5879
[log in to unmask]
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