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Jarnistech > High TG PCB > FR4 TG PCB
FR4 TG PCB Boards

FR4 TG PCB stands out as a high-performance laminate material renowned for its exceptional blend of electrical, mechanical, thermal, and chemical characteristics. This makes it a prime selection for diverse high-frequency and high-speed applications such as microwave circuits, high-speed digital circuits, wireless communications, automotive electronics, and aerospace and defense industries.

This inclusive guide is tailored to provide an in-depth exploration of FR4 TG PCB, covering its material properties, design intricacies, manufacturing procedures, and extensive array of applications. Gain comprehensive insights into the world of FR4 TG PCB, empowering you with the knowledge needed to leverage its capabilities effectively in your projects.

What is FR4 TG PCB?

FR4 TG PCB, also known as High TG (glass transition temperature) PCB, is a type of printed circuit board constructed with a substrate material that has a high glass transition temperature. This high TG material is designed to withstand elevated temperatures during the PCB manufacturing process, as well as during operation in high-temperature environments. FR4 TG PCBs offer improved thermal resistance, better mechanical strength, and enhanced reliability compared to standard PCBs, making them ideal for applications that require high reliability and performance under harsh conditions.

Why FR4 High TG PCB Material Is More Preferable?

The World Health Organization is advocating for an increase in the production of pollution-free electronic waste. In alignment with this initiative, the PCB industry is focusing on the manufacturing of high Tg PCBs.

High Tg PCB prototypes are preferred due to their lead-free composition, which plays a significant role in reducing E-waste pollution. The use of high Tg materials eliminates the need for additional adhesives to secure components in place.

The properties of high Tg PCBs make them well-suited for applications that may involve de-soldering or require precise equipment alignment. These PCBs are commonly utilized in sensor, motor, and motion control applications, where stability and accuracy are paramount.

Material Properties of FR4 TG PCB

FR4 TG PCB is a high-performance laminate material renowned for its exceptional combination of electrical, mechanical, thermal, and chemical properties, rendering it an optimal choice for a diverse array of high-frequency and high-speed applications.

Electrical Properties:

●Demonstrates a low dielectric constant (Dk) and dissipation factor (Df).
●Delivers outstanding high-frequency performance.
●Exhibits stable electrical properties across a broad temperature spectrum.
●Minimizes signal loss.

Mechanical Properties:

●Offers high flexural strength and modulus.
●Ensures good dimensional stability.
●Features a low coefficient of thermal expansion (CTE).
●Compatible with standard PCB fabrication processes.

Thermal Properties:

●Boasts a high glass transition temperature (Tg).
●Showcases excellent thermal conductivity.
●Presents a low thermal expansion coefficient.
●Resists thermal shock.

Chemical Properties:

●Resilient to most solvents and chemicals.
●Possesses good solderability.
●Compliant with RoHS and UL94 V-0 flammability standards.

Other Properties:

●Demonstrates low moisture absorption.
●Showcases good processability.
●Offers a cost-effective solution relative to other high-performance PCB materials.

FR4 TG PCB is ideally suited for applications including:

●Microwave circuits
●High-speed digital circuits
●Wireless communications
●Automotive electronics
●Aerospace and defense

This versatile material is available in various thicknesses and copper foil weights to cater to the unique requirements of diverse applications. Additionally, RF4 TG PCB can be customized with special features such as blind and buried vias, controlled impedance, and surface finishes to further enhance its functionality and performance.

Advantages and Disadvantages of FR4 TG PCB

Advantages of FR4 TG PCB:

1. High thermal resistance: FR4 TG PCBs can withstand elevated temperatures without compromising their performance, making them suitable for applications in high-temperature environments.

2. Improved reliability: The high glass transition temperature of FR4 TG PCBs enhances their mechanical strength and durability, resulting in improved reliability and longevity.

3. Excellent high-frequency performance: FR4 TG PCBs offer low dielectric constant and dissipation factor, making them ideal for high-frequency applications such as microwave circuits and wireless communications.

4. Good dimensional stability: FR4 TG PCBs exhibit high flexural strength and modulus, ensuring good dimensional stability even under extreme conditions.

5. Chemical resistance: FR4 TG PCBs are resistant to most solvents and chemicals, providing protection against corrosion and degradation.

6. Cost-effective: Despite their high-performance characteristics, FR4 TG PCBs are relatively cost-effective compared to other high-performance PCB materials.

Disadvantages of FR4 TG PCB:

1. Limited availability: FR4 TG PCBs may not be as readily available as standard PCB materials, which could lead to longer lead times for procurement.

2. Specialized processing: FR4 TG PCBs may require specialized processing techniques due to their high thermal resistance and other unique properties, which could increase manufacturing costs.

3. Complexity: The high-performance characteristics of FR4 TG PCBs may result in a more complex design and manufacturing process, requiring skilled technicians and engineers for optimal performance.

4. Brittle: FR4 TG PCBs may be more brittle compared to standard PCB materials, necessitating careful handling during assembly and installation to prevent damage.

5. Higher cost: While FR4 TG PCBs are cost-effective relative to other high-performance materials, they may still be more expensive than standard PCB options, potentially impacting overall project costs.

Factors to Consider when Choosing FR4 TG PCB

When choosing FR4 TG PCB for a specific application, several factors should be taken into consideration to ensure optimal performance and reliability. Some key factors to consider include:

1. Thermal Resistance: Consider the operating temperature range of the application and choose an FR4 TG PCB material with a suitable glass transition temperature (TG) to ensure thermal stability and reliability under high-temperature conditions.

2. Dielectric Constant and Loss Tangent: The dielectric constant and loss tangent of the FR4 TG PCB material will affect the signal integrity and performance of high-frequency circuits. Select a material with low dielectric constant and loss tangent for better high-frequency performance.

3. Mechanical Strength: Evaluate the mechanical strength and durability of the FR4 TG PCB material, considering factors such as flexural strength, modulus of elasticity, and resistance to mechanical stress, to ensure reliable performance in demanding environments.

4. Chemical Resistance: Choose an FR4 TG PCB material that offers good chemical resistance to ensure protection against corrosion and degradation when exposed to harsh chemicals or solvents.

5. Dimensional Stability: Consider the dimensional stability of the FR4 TG PCB material to ensure consistent and reliable performance over time, especially in applications with temperature variations or mechanical stress.

6. Cost: Evaluate the cost-effectiveness of the FR4 TG PCB material in relation to the specific requirements and performance characteristics of the application, considering factors such as material cost, manufacturing complexity, and overall project budget.

7. Supplier Reliability: Choose a reputable and reliable supplier of FR4 TG PCB materials with a track record of quality products, technical expertise, and customer support to ensure consistent performance and timely delivery.

By carefully considering these factors and selecting the most appropriate FR4 TG PCB material for the specific application requirements, you can ensure optimal performance, reliability, and cost-effectiveness of the PCB in your electronic design.

Design Considerations for FR4 TG PCB

When designing FR4 TG PCBs, there are several critical factors that must be considered to ensure optimal performance and reliability.

Layer Stack Design:

●Determine the required number of layers based on circuit complexity and signal routing needs.
●Select appropriate dielectric materials and thickness for each layer to achieve the desired impedance and signal integrity.
●Utilize prepregs and core materials with low dielectric loss and controlled impedance.

Impedance Control:

●Calculate trace width and spacing to achieve the desired impedance and dielectric constant.
●Use impedance calculators or simulation tools to verify impedance and minimize signal reflections.
●Account for trace length, via placement, and component parasitics when considering impedance.

Trace Routing:

●Route high-speed signals on designated layers with controlled impedance.
●Avoid sharp bends and vias in high-speed signal traces.
●Keep trace lengths to a minimum to reduce signal loss and crosstalk.
●Employ differential routing techniques for high-speed digital signals.

Component Placement:

●Position components in close proximity to associated traces to minimize parasitics and signal loss.
●Orient components parallel to signal flow to decrease crosstalk.
●Use vias to connect components to different layers when necessary.
●Consider component thermal dissipation and implement adequate cooling measures as required.

Other Design Considerations:

●Implement proper grounding and power distribution strategies to reduce noise and electromagnetic interference (EMI).
●Consider the use of shielding or isolation layers to mitigate crosstalk between different circuit sections.
●Design for manufacturability by considering drill size, via spacing, and solder mask openings.
●Conduct simulations and testing to validate PCB design performance prior to fabrication.

By adhering to these design considerations, engineers can develop high-performance FR4 TG PCBs that meet the stringent requirements of modern electronic devices.

Manufacturing Processes for FR4 TG PCB

The manufacturing process for FR4 High Tg PCBs is similar to that of other types of PCBs, with additional considerations to ensure optimal high-frequency performance and reliability.

Raw Material Selection:

●Careful selection of FR4 High Tg prepregs and core materials with controlled dielectric properties and low loss characteristics is essential.

●Choosing copper foil with suitable thickness and surface finish is crucial for maintaining high-quality electrical performance.


●During lamination, prepregs and core materials are bonded together under specific heat and pressure conditions to create the multilayer structure.

●Precise temperature and pressure profiles are employed to promote proper bonding and minimize warpage issues.

Drilling and Routing:

●Drilling is carried out to create holes for vias and component placement, while routing is performed to establish the desired trace patterns.

●Utilizing precise drilling and routing techniques is key to preserving impedance control and minimizing signal loss.


●Applying copper plating to exposed copper surfaces is essential for forming the conductive traces and pads.

●The choice between electroless plating or electrolytic plating depends on the required thickness and surface finish specifications.


●Components are placed on the PCB and soldered into position using either surface mount technology (SMT) or through-hole technology (THT), based on the component type and design requirements.

●In high-volume production scenarios, automated assembly equipment is often utilized.

Quality Assurance:

●Electrical testing is conducted to validate the functionality and performance of the PCB.

●Mechanical testing ensures the strength and durability of the PCB, while environmental testing assesses its resistance to various environmental factors.

Additional Considerations:

●Controlled impedance fabrication techniques are employed to meet the desired impedance requirements for the PCB traces.

●Blind and buried vias may be utilized to reduce signal loss and crosstalk.

●Special surface finishes like gold plating or solder mask application can enhance solderability and safeguard the PCB in harsh environments.

By meticulous adherence to these manufacturing processes and stringent quality control measures, manufacturers can produce top-quality FR4 High Tg PCBs that satisfy the rigorous demands of high-frequency and high-speed applications.

Applications of FR4 TG PCB Materials

FR4 TG PCB materials are widely used in various industries and applications due to their exceptional combination of electrical, mechanical, thermal, and chemical properties. Some of the key applications of FR4 TG PCB materials include:

1.Microwave Circuits:

FR4 TG PCBs are ideal for microwave circuits due to their low dielectric constant and dissipation factor, which enable high-frequency performance and signal integrity.

2.High-Speed Digital Circuits:

FR4 TG PCB materials are well-suited for high-speed digital circuits, offering stable electrical properties over a wide temperature range and low signal loss.

3.Wireless Communications:

FR4 TG PCBs are commonly used in wireless communication systems, providing reliable performance and signal transmission for applications such as antennas and RF modules.

4.Automotive Electronics:

FR4 TG PCB materials are utilized in automotive electronics for their high thermal resistance and reliability, making them suitable for under-the-hood applications and harsh environments.

5.Aerospace and Defense:

FR4 TG PCBs are preferred in aerospace and defense applications for their high mechanical strength, thermal stability, and resistance to thermal shock, making them suitable for avionics, radar systems, and military equipment.

6.Industrial Control Systems:

FR4 TG PCB materials are used in industrial control systems for their excellent thermal conductivity, chemical resistance, and reliability in harsh industrial environments.

7.Medical Devices:

FR4 TG PCBs are employed in medical devices for their high performance and reliability, ensuring accurate signal transmission and data processing in critical healthcare applications.


FR4 TG PCB materials are commonly used in telecommunications equipment and infrastructure for their high-frequency performance, signal integrity, and durability in demanding communication networks.


In the design phase, the Glass Transition Temperature (Tg) stands out as a critical feature to prioritize when selecting PCBs. It is essential to carefully consider the material choice based on the specific operational requirements, whether they involve high-temperature or low-temperature conditions.

FR4 TG PCB serves as a versatile and high-performance material that holds significant importance in the realm of modern electronic devices. Delving into the material properties, design considerations, manufacturing procedures, and applications of FR4 TG PCB empowers engineers to develop top-tier PCBs that align with the stringent standards of contemporary electronic devices.

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