What does High TG means?

In printed circuit boards (PCBs), "High TG" refers to "High Glass Transition Temperature". The glass transition temperature is the temperature at which a material changes from a hard and brittle state to a soft state. For PCB materials, an increase in TG value indicates that the material can maintain its mechanical and electrical properties at higher temperatures.

High TG PCBs are often used in high temperature environments or applications that require high reliability, such as automotive electronics, industrial equipment, and certain communication equipment. In these applications, common TG values ​​are above 170°C or even higher. For example, the TG value of common FR-4 materials is between 130°C and 150°C, while the TG value of high TG materials can reach 180°C or even 220°C.

PCBs using high TG materials have the following advantages:

1. Improved thermal stability: Ability to work in high temperature environments and reduce performance changes caused by thermal expansion.
2. Excellent electrical properties: Good dielectric properties and insulation can still be maintained at high temperatures.
3. Moisture resistance: High TG materials generally have lower moisture absorption rates, which enhances the stability of PCBs in humid environments.

Therefore, choosing PCB with high TG material is to improve the reliability of the product in extreme environments.