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Thermal Pads - knowledge database

W

wirk

Gawd
Joined
Sep 2, 2014
Messages
811
Having a need for thermal pads I noticed they are available with different thickness and thermal conductivity. This raises some questions:

How to select thermal pads?

How important is thermal conductivity in practice?

What is the thickness of thermal pads commonly used?

Which thermal pads are best/are they all very similar?

Which thermal pads (thickness, brand) are recommended for the VRM, chipset, GPU RAM?

Any other issues concerning thermal pads?
 
If your goal is effective heat transfer to a heatsink, you want to pick one that has the highest thermal conductivity and that is as thin as possible to close the gap.

From my knowledge, paste would be superior, with pads being used in cases where the gap is too large for a paste or for cost savings.
 
The thickness of the thermal pad should be as small as possible. You just want to have contact. The thicker the thermal pad the worse it performs. Thermal pads are typically used where the height tolerance is too great to guarantee contact with just thermal paste. It gives a bit more wiggle room when designing something like a full cover GPU waterblock.
 
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