How to Choose High TG PCB?

20 December 2024

High TG PCB has a great role to play for products that require better heat resistance. TG is the point at which the PCB material changes from a rigid state to a softened rubber-like state under heating. High TG PCB is very suitable for high power, high speed or high temperature environment. But how to choose the right high TG PCB?

What is TG in PCB?

The TG value of PCB refers to the temperature at which the substrate of the circuit board begins to lose rigidity. For standard PCBs, TG is usually between 130°C and 140°C. However, in high TG PCBs, this value rises to 170°C or higher. This makes high TG PCB more resistant to heat and mechanical stress.

The characteristic of high TG PCB is to withstand high temperature without deformation, which leads to a more complete structure, reduced risk of delamination, and better performance in high-frequency applications.

When should high TG PCB be used?

Not all applications require high TG PCB. However, they are necessary in specific scenarios, such as:

High-temperature environments: If your device operates at more than 130°C, you need a high TG PCB to handle the heat.

High-power applications: Products such as power supplies or motor controllers that generate a lot of heat. High TG PCBs prevent overheating and material degradation.

High-speed circuits: High-frequency or high-speed circuits generate more heat due to fast signal transmission speeds. High TG materials ensure signal integrity and stability.

Multi-layer PCBs: As the number of PCB layers increases, the risk of heat accumulation also increases. High TG materials are also a good choice.

Factors to Consider When Choosing High TG PCBs

1. TG Value

The TG grade of the PCB material is the first and most critical factor. For most applications, a TG of 170°C to 180°C is sufficient. For extreme environments, consider materials with a TG value of more than 200°C.

2. Coefficient of Thermal Expansion

A lower CTE is desirable because it minimizes expansion and contraction caused by temperature changes. High TG materials generally have better CTE performance, which reduces the risk of delamination.

3. Thermal Conductivity

Look for materials with higher thermal conductivity to effectively dissipate heat. This is especially important for high-power applications.

4. Cost

High TG PCBs are more expensive than standard boards. Evaluate your budget and application requirements to avoid overspending on non-essential features.

Conclusion

Choosing a high TG PCB requires understanding whether there is a need. If there is a special requirement for operating temperature, then it is necessary to choose a high TG PCB. Find a PCB with the most suitable TG value from cost and demand to ensure that the project can control costs while ensuring performance.

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