Heat Sinks

I was wondering about the heat sinks that we usually put on the devices that dissipate more heat.

Aluminum heat sink are very common.

But if we look at the thermal conductivity of Aluminum and compare with Copper, Silver and Gold than we get.

Heat Conductivity: Silver>Copper>Gold>Aluminum.

This means that Copper is better then Aluminum. And Silver is better then Copper.

Any reason we can’t use Silver as heat sink ?

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You can use silver as a heat sink but it’s really expensive compared to other materials. Actually the conductive fill material some like for thermal vias has a high silver content. There are also highly conductive bond materials with high silver content but again they are really expensive. Another issue with silver materials is the cost is tied to the market price of silver so the price can vary from day to day.