High-TG PCB materials are highly suitable and even essential for modern automotive electronics, especially for new energy vehicles, intelligent driving systems, and under-hood electronic components. The glass transition temperature (Tg) refers to the threshold where PCB substrate materials transition from rigid glassy states to flexible rubbery states. Standard FR4 materials have a Tg value of 130–150°C, which cannot withstand the long-term high-temperature environment of automotive engine compartments, where ambient temperatures often exceed 125°C. In contrast, high-TG PCB materials (Tg ≥170°C, up to 180°C or higher) maintain stable mechanical and electrical properties under continuous high-temperature exposure, avoiding substrate warpage, delamination, and dimensional deformation.

Automotive electronics have extremely strict reliability requirements for PCBs, including resistance to thermal cycling, mechanical vibration, and humid aging, all of which are core advantages of high-TG materials. Automotive electronic control units (ECUs), battery management systems (BMS), motor drive controllers, and autonomous driving sensing modules face frequent temperature fluctuations from extreme cold to extreme heat during vehicle operation. High-TG laminates feature low coefficient of thermal expansion (CTE), which effectively reduces stress on copper traces and solder joints during thermal cycling, preventing cracking and open circuits. Meanwhile, their high decomposition temperature (Td ＞340°C) adapts to high-temperature lead-free reflow soldering processes, ensuring structural integrity during multiple assembly and rework cycles.

High-TG PCB materials fully comply with mainstream automotive reliability standards such as AEC-Q100, making them the preferred substrate for grade-0 and grade-1 automotive electronic products. For vehicle-mounted cabin low-power modules with mild operating environments, standard TG materials can meet basic needs, but all core power and safety-related automotive electronic components must adopt high-TG PCBs. With the rapid development of new energy vehicles and intelligent driving, automotive electronic systems have become more integrated and high-power, generating more concentrated heat. High-TG materials’ excellent thermal stability and long-term reliability effectively reduce product failure rates and extend the service life of vehicle-mounted electronic equipment, proving irreplaceable in automotive electronic applications.