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PCB Power dissipation?

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btbass

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With a FR4 PCB 1.6mm thick 4 layer, 25mm by 50mm how much wattage could we dump into the PCB to get ≤50°C rise?
 

It depends on convection resistance, orientation,solder mask coating air flow velocity copper thickness, Case Rjc

I would guestimate 5W~10W. More important is the Tj, not Tcu to not exceed 50 deg C rise for reliability.
 

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