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High-TG PCB
High-Tg PCB refers to a printed circuit board manufactured using a substrate material with a high glass transition temperature (Tg), typically greater than 170°C (while standard FR-4 materials are around 130–150°C).
Simply put, Tg is the critical temperature at which the substrate transitions from a rigid “glassy state” to a soft “rubbery state.” The core value of a high-Tg PCB lies in its ability to maintain excellent mechanical strength, dimensional stability, and electrical performance under high-temperature environments—properties that are critical to the reliability of modern electronic products.
High Tg PCB Materials
High Tg PCB materials refer to materials with a high glass transition temperature (Tg), which is the temperature at which the material transitions from a hard and brittle state to a more flexible state. High Tg materials are commonly used in printed circuit board (PCB) manufacturing, especially in applications where high thermal stability and reliability are required. Here are some of the commonly used high Tg PCB materials:
FR-4: This is a common PCB substrate material made from woven fiberglass cloth and an epoxy resin binder. It has a Tg of around 130°C, which makes it suitable for most electronic applications.
High Tg FR-4: This is an improved version of FR-4 with a higher Tg of around 170°C. It is used in applications that require higher thermal stability, such as high-power applications and automotive electronics.
Polyimide: This is a high-temperature plastic that has a Tg of around 250°C. It is often used in applications that require high thermal stability, such as aerospace and military electronics.
PTFE (Teflon): This is a high-temperature plastic with a Tg of around 120°C. It is commonly used in applications that require low dielectric constant, such as high-frequency and microwave circuits.
Ceramic: This is a high-temperature material that has a Tg above 500°C. It is commonly used in high-power and high-temperature applications, such as power electronics and sensors.
When selecting a high Tg PCB material, it’s important to consider the specific requirements of your application, such as thermal stability, mechanical strength, and electrical properties, to ensure the material is suitable for your needs.
High Tg PCB Types
There are several types of high Tg PCBs available, each with its own unique properties and characteristics. Some of the common types of high Tg PCBs include:
Standard high Tg PCBs: These are PCBs that use standard high Tg materials such as FR-4 with Tg values of around 170°C. They are widely used in a variety of applications.
Halogen-free high Tg PCBs: These are PCBs that use halogen-free materials such as halogen-free FR-4 with Tg values of around 170°C. They are environmentally friendly and comply with regulations such as RoHS and WEEE.
Low-loss high Tg PCBs: These are PCBs that use low-loss materials such as PTFE or ceramic with Tg values above 170°C. They are ideal for high-frequency and microwave applications.
Heavy copper high Tg PCBs: These are PCBs with thick copper layers for high-current applications. They use high Tg materials with Tg values above 170°C for improved thermal stability.
When selecting a high Tg PCB type, it’s important to consider your specific application requirements and choose a PCB type that can meet your needs. ELIPCB offers a range of high-quality high Tg PCB types that can meet a wide range of applications.
Core Advantages & Technical Parameters
Compared to standard PCBs, high-Tg PCBs offer significant performance advantages:
Excellent Heat Resistance: Capable of withstanding high-temperature processes such as lead-free soldering, reducing the risks of softening, deformation, and delamination under high heat.
Superior Mechanical Stability: Maintains rigidity at high temperatures, features a lower Z-axis coefficient of thermal expansion (CTE), and effectively prevents via hole fracture.
High Reliability: Exhibits better resistance to moisture, chemicals, and thermal shock, making it suitable for harsh environments.
The following table shows the Tg grades and corresponding maximum operating temperatures according to industry standards (typically with a safety margin of about 20°C):
| Grade | Tg Value | Max Operating Temp. | Material Type |
|---|---|---|---|
| Low Tg | > 130°C | ~ 110°C | Standard FR-4 |
| Medium Tg | > 150°C | ~ 130°C | Modified FR-4 |
| High Tg | > 170°C | ~ 150°C | High-heat-resistance FR-4 |
| Ultra-high Tg | 250°C and above | ~ 230°C | Polyimide, Ceramic, PTFE |
Main Applications
High-Tg PCBs are primarily used in fields that demand strict thermal stability and reliability:
Communication Equipment: 5G base stations, high-frequency microwave stations. Ensures stable signal transmission in outdoor high-temperature and high-power RF environments.
Automotive Electronics: Engine Control Units (ECUs), transmission sensors, new energy vehicle BMS (Battery Management System). Withstands high temperatures and intense vibration in engine compartments.
Industrial Control: PLC controllers, servo drives, metallurgical and chemical equipment. Ensures long-term, trouble-free operation in high-temperature, dusty workshop environments.
Aerospace: Airborne radar, satellite communications, flight control computers. Resists severe temperature cycling and radiation in space or high-altitude conditions.
High-end Consumer Electronics: High-performance servers, gaming laptop motherboards. Supports heat dissipation and power delivery requirements of high-power processor chips.
Design & Selection Advice
When selecting a high-Tg PCB, please consider the following points:
Material Selection: The most common choice is high-Tg FR-4 (Tg 170–180°C), which offers good cost-effectiveness. If higher temperature resistance (>200°C) is required, consider polyimide or PTFE materials.
Cost & Manufacturing: High-Tg boards are typically 50%–100% more expensive than standard FR-4. Additionally, because the material becomes more brittle, it imposes stricter requirements on drilling and shaping processes during manufacturing. An experienced manufacturer should be chosen.
Compatibility: Ensure that the temperature ratings of components on the board (especially BGA chips and connectors) match those of the PCB substrate.
Need High TG PCB?
If you need high Tg PCB for your electronic applications, don’t settle for anything less than the best. Choose ELIPCB as your supplier and get access to high-quality, reliable PCBs with excellent thermal stability and performance. Contact ELIPCB today to learn more!