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PCB thermal resistance

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shauns87

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Is there a way to calculate overall PCB thermal resistance or thermal conductivity of a PCB based on the PCB stackup information? I would like to use this input in thermal analysis of the PCB. Thanks.
 
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Hi,

It's like asking the distance from a person to his/her mother.

It highly depends..... on multiple factors.
From which position to which position, distance, area, material, stackup, layers.....

Klaus
 
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What do you mean with "overall PCB resistance"? Is it Rth between a single component on the PCB and ambient? If so, it's a 3D problem, depending on the parameters mentioned by KlausST, in addition PCB orientation, airflow respectively convection conditions.

An exact analysis is very complex, there are professional tools like 6Sigma performing it based on a geometry model.
 
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Are you looking for a book on how to thermal design on the PCB or a simple question like total power is with N pwr. chips.

Have you considered sinkpads? Alumclad substrates? Thermal vias? Heat Flow of enclosure's thermal resistance , closed, vs open vs orientation, vs forced air?
 
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