What is a High Tg Printed Circuit Board?
Tg is the glass transition temperature of a Printed Circuit Board. It is the temperature at which the base material of a PCB starts to transform from a brittle structure to a soft and elastic. A PCB whose glass transition temperature (Tg) is greater than 170 °C is known as a High Tg PCB. Generally, Tg values for PCBs lie between 120 and 170 °C. Every PCB has a different Tg value based on its substrate. If the operating temperature of the board exceeds its Tg value, the board will begin to change its state which will have an adverse effect on the functionality of the PCB.
High Tg PCB boards perform better at high temperatures with better stability as the substrate provides better heat resistance, and chemical and mechanical stability to the board. When selecting a PCB, the Tg value should be at least 20-25 degrees Celsius higher than the expected operating temperature of the device in which the PCB is used. For instance, if you have a PCB with a Tg value of 130 degrees Celsius then the working temperature of the device should be lower than 110 degrees Celsius.
Advantages of High Tg PCBs
Characteristics such as moisture, chemical, and stability resistance are all enhanced and improved. The characteristics of High Tg materials include:
- Stability: PCBs with high Tg have better stability in heat resistance, chemical resistance, and moisture resistance.
- Heat dissipation: A high Tg PCB has good heat dissipation if the device has high power density and fairly high heat generation.
- Ideal for Multilayer and HDI PCB: Since Multilayer and HDI PCB are more compact and circuit dense, they will result in high heat dissipation. Therefore, high Tg PCBs are usually a choice for multilayer and HDI PCBs to ensure the reliability of PCBs.
PCB Directory has listed the leading High Tg PCB fabricators and manufacturers and made them searchable through their location and capabilities. You can choose a country to filter and find local PCB manufacturers or companies nearby that can develop your printed circuit boards. Additionally, you can filter PCB suppliers based on specific capabilities such as the number of layers, material, and more. PCB Directory will then optimize the results to display manufacturers that meet your requirements.
