What effect does the thickness of the thermally conductive silicone sheet have on the heat dissipation of electronic products?

In the use of modern electronic products, the heating problem is already extremely serious. In order to ensure operating efficiency, it is necessary to actively work to solve the heat dissipation problem. For example, in PCs, in order to solve the heat generation problem of the CPU, thermal grease is usually applied between the heat sink and the CPU. Today, with scientific development, electronic products are running faster and faster, and heat dissipation is still the effort of various manufacturers. One big problem to be solved is that thermally conductive silicone sheets are widely used today. It is called a new generation of new thermally conductive technology. It has shown the possibility of replacing silicone grease when it goes on the market. The choice for it is mainly determined by the thickness!

Strictly speaking, the thickness of a thermally conductive silicone sheet is inseparable from its thermal conductivity. Why do you say that? Let's start with the heat conduction path and principle of the thermal silica film. First of all, we must be clear that when a thermally conductive silicone sheet is pasted on a heating component, its working principle is to transfer heat from one end to the other. The closer the distance between the heating element and the heat sink, the more sufficient the heat can be transferred. The more, the lower the thermal resistance, the better the thermal conductivity. So, what effect does the thickness of the thermally conductive silicone sheet have on the heat dissipation of electronic products? Let's take a look together!

The thickness will directly affect the thermal resistance coefficient

The thermal resistance coefficient refers to the resistance it encounters during heat transfer. Literally speaking, the smaller the resistance, the stronger the thermal conductivity. The thermal resistance coefficient of the thermal grease used in early PCs is very low, so it is very popular with manufacturers, but the big problem with silicone grease is that after long-term use, It may dry out. The thickness of the thermally conductive silicone sheet determines the thermal resistance coefficient. However, it should be noted that the thinner the thermally conductive silicone sheet, the better the thermal conductivity. The choice of thickness depends mainly on the specific heat dissipation object.

The thickness is different, the price is also different

Thermally conductive silicone sheet has shrinkage, so to a certain extent, it also plays a shock-proof effect on electronic products. It can not only resist shock but also conduct excess heat away. The thickness of the thermal silica film is different and the price is also different. When choosing a thermal conductive silicone sheet for electronic products, the thickness should be determined according to the actual situation. Too thick and thin will cause corresponding waste. Usually the thickness is selected in a wide range, between 0.2mm-10mm, and the thickness is different to determine the heat transfer. The length of the path also determines the size and price of the thermal resistance coefficient.

The thickness will determine the overall structural design

In today's era, the design of electronic circuits is becoming more and more complex, and the circuit integration is getting higher and higher. But because of this, there are many different sizes of chips on a circuit board, their size and voltage are different, and the heat dissipation is also Not the same, not to mention the uneven distribution of the overall circuit board. To serve such a complicated circuit well, the thermal conductive silicone sheet should be treated specifically for the thickness of the silicone sheet on each chip, rather than a uniform thickness to solve all problems. The thickness of the thermally conductive silicone sheet has an impact on the heat dissipation of electronic products at their market-oriented prices, and will also affect the overall structural design of the product. It must be said that in modern electronic products, the thermally conductive silicone sheet is an important part of it.