Tg 180 PCB: Advancing PCB Performance

I. Introduction 

Tg 180 PCB, or high glass transition temperature PCBs, are a specialized type of circuit board designed to withstand elevated temperatures without compromising their structural integrity. Tg refers to the temperature at which the base material of a PCB undergoes a transition from a rigid, glassy state to a more flexible, rubbery state. In high-Tg PCBs, the glass transition temperature is significantly higher than in conventional PCBs, allowing them to endure extreme thermal conditions.

Tg 180 PCB

The significance of the glass transition temperature lies in the operational demands of electronic devices such as computers, automotive systems, and telecommunications equipment. These devices are frequently subjected to harsh conditions characterized by elevated temperatures. As electronic components generate heat during their operation, it becomes crucial for PCBs to dissipate this heat to sustain optimal functionality and reliability efficiently. If a PCB possesses a low Tg, it may begin to soften or deform under high temperatures, thus compromising the integrity of the entire circuitry.

This is precisely where High Tg PCBs demonstrate their importance. By utilizing materials with elevated Tg values, these PCBs offer exceptional thermal resistance, ensuring the stability of the circuit board even in demanding environments. The heightened Tg of the substrate enables High Tg PCBs to withstand elevated temperatures without undergoing physical changes that could degrade performance or lead to failure.

The advantages derived from increasing Tg in PCB substrates are abundant. Primarily, it enhances the mechanical strength of the PCB, rendering it more resistant to warping, cracking, or bending. This attribute is especially critical in applications subjected to significant vibration or mechanical stress. Moreover, High Tg PCBs exhibit enhanced solder ability, thereby improving the reliability of solder joints and mitigating the risk of solder cracks, particularly during reflow soldering processes. Furthermore, the augmented thermal stability of High Tg PCBs contributes to efficient heat dissipation, effectively preventing excessive heat accumulation and subsequent damage to delicate electronic components. By proficiently managing thermal stress, High Tg PCBs extend the operational lifespan of electronic devices and ensure continuous performance even under extreme conditions.

High-Tg PCBs have revolutionized the electronics industry by delivering superior thermal and mechanical properties to conventional PCB materials. These specialized substrates offer improved durability, reliability, and heat dissipation capabilities by elevating the glass transition temperature. As we progress further in this article, we will delve into the various applications where High Tg PCBs are making a substantial impact and how they propel PCB performance in the ever-evolving world of technology.

II. TG 180 PCB

Introduction to TG180 PCB

When it comes to pushing the limits of PCB performance, TG180 circuit boards have emerged as a revolutionary development. TG180, abbreviated as “180°C glass transition temperature,” denotes a distinct high-Tg PCB renowned for its extraordinary thermal resilience and dependability. In the subsequent segment, we shall thoroughly examine TG180 PCBs, investigating their composition, distinctive attributes, and the crucial influence of temperature on the integrity of these boards.

Composition and Characteristics of TG180 PCB

TG180 PCBs are manufactured utilizing specialized components that showcase an elevated glass transition temperature (Tg) of 180°C or beyond. These materials, frequently known as high-Tg laminates, consist of fortified epoxy resin combined with glass fibers. Integrating these resilient materials yields a PCB substrate with remarkable thermal durability and mechanical potency.

The composition of TG180 PCBs further encompasses copper foil layers, which function as the conductive routes for electrical signals. These copper layers are scrupulously etched to generate intricate circuit patterns, facilitating the smooth movement of current across the board.

Copper foil layers for TG180 PCB
Copper foil layers for TG180 PCB

One of the critical characteristics of TG180 PCBs is their exceptional thermal conductivity. This attribute enables efficient heat dissipation, allowing the PCB to maintain its performance and functionality even in demanding high-temperature environments. The increased thermal conductivity prevents the accumulation of heat, mitigating the risk of component failure or circuit malfunction.

TG180 PCBs also exhibit a low Z-axis thermal expansion coefficient, which means they expand less when exposed to temperature variations. This characteristic minimizes the risk of stress-induced cracks or solder joint failures, ensuring the long-term reliability of the PCB.

Moreover, TG180 PCBs offer improved mechanical performance, including excellent dimensional stability. This stability ensures that the PCB retains its shape and size, even when subjected to temperature fluctuations or mechanical stress. Dimensional stability is vital for precise component placement and reliable interconnectivity.

Composition and Characteristics of TG180 PCB
Composition and Characteristics of TG180 PCB

Impact of Temperature on TG180 Board Integrity

Temperature plays a crucial role in determining the integrity and reliability of TG180 PCBs. The high glass transition temperature of 180°C allows these PCBs to withstand elevated temperatures without compromising their structural integrity. This temperature resilience is essential during various stages of PCB manufacturing, including assembly processes involving soldering and reflow.

TG180 PCBs maintain stability and performance during operation, even when subjected to significant thermal loads. They can effectively dissipate heat generated by power-hungry components, ensuring optimal functionality under demanding conditions. The ability of TG180 PCBs to withstand high temperatures makes them ideal for applications where heat dissipation and reliability are paramount.

However, it is essential to note that exceeding the recommended operating temperature limits can still affect the long-term performance and lifespan of TG180 PCB. Therefore, careful consideration must be given to the operating environment and temperature specifications during the design and deployment of electronic systems.

III. Designing a High TG180 PCB


Designing a high-Tg (glass transition temperature) PCB involves carefully considering the materials used in its construction. Selecting the suitable base material is critical to ensure the PCB’s thermal stability, reliability, and overall performance.

For high-Tg PCBs like TG180, specialized materials with a high glass transition temperature are employed. Commonly used materials include FR-4 (Flame Retardant-4) with an enhanced Tg or technical laminates such as high-Tg epoxy or polyimide. These materials offer excellent heat resistance and mechanical strength, allowing the PCB to endure extreme temperatures without compromising its integrity.


FR-4 (Flame Retardant-4) layers
FR-4 (Flame Retardant-4) layers

When choosing the material for a high-Tg PCB, factors such as the operating temperature range, required thermal conductivity, and compatibility with manufacturing processes must be considered. Consulting with PCB material experts or manufacturers can provide valuable insights into selecting the most suitable material for your application.

Stack-Up Layer

The stack-up layer design is crucial in optimizing high-Tg PCBs’ performance and functionality. The stack-up refers to the arrangement and configuration of various layers within the PCB, including signal, power, and ground planes.

In high-Tg PCBs, the stack-up design focuses on achieving effective heat dissipation and minimizing thermal stress. This involves strategically placing heat-generating components closer to copper planes to facilitate efficient heat transfer. Additionally, incorporating additional copper layers or thermal vias can enhance heat dissipation by providing a pathway for heat to escape from the PCB.

Furthermore, the stack-up layer design should consider impedance control requirements, signal integrity, and electromagnetic compatibility (EMC) considerations. Adhering to industry standards and guidelines and utilizing simulation tools can help optimize the stack-up design for high-Tg PCBs.


Selecting the right components is another critical aspect of designing a high-Tg PCB. The features must be compatible with elevated temperatures and have suitable thermal characteristics to ensure long-term reliability. Choosing components that can withstand the maximum operating temperature specified for the PCB is critical.

Components with high-temperature ratings, such as ceramic capacitors, high-temperature resistors, and lead-free solder, are often preferred for high-Tg PCB designs. These components can withstand thermal stress and temperature fluctuations without compromising electrical performance or structural integrity.

Proper component placement and thermal pad design are also essential to facilitate efficient heat transfer and prevent localized heating. Adequate spacing and thermal vias help dissipate heat from hotspots, ensuring uniform temperature distribution across the PCB.

IV. Specific Effects of Temperature on TG180 Board

Crosslinking and Molecular Weight Changes

One of the notable effects of temperature on TG180 PCBs is the process of crosslinking and changes in molecular weight. At elevated temperatures, the resin materials used in the PCB undergo a crosslinking reaction, which strengthens the bonds between polymer chains. This cross-linking process increases stability, higher mechanical strength, and improved resistance to thermal stress.

Simultaneously, the molecular weight of the resin materials may also change due to temperature. Higher temperatures can cause the molecular chains to break down or rearrange, affecting the overall structure and properties of the PCB material. Therefore, selecting high-Tg materials with excellent thermal stability is essential to minimize molecular weight changes and ensure long-term reliability.

Polymer Flexibility and Its Impact on the Board

Temperature variations also influence the flexibility of the polymer materials used in TG180 PCBs. As the temperature rises above the glass transition temperature (Tg), the polymer transitions from a rigid state to a more flexible, rubbery state. This change in polymer flexibility can affect the mechanical behavior and performance of the PCB.


Polymer transitions from a rigid state to a rubbery state
Polymer transitions from a rigid state to a rubbery state

The flexibility of the polymer materials becomes particularly crucial during thermal cycling or when the PCB is exposed to rapid temperature changes. When subjected to thermal cycling, PCBs with low Tg materials may experience significant dimensional changes or stress-induced failures. However, with high-Tg materials like those used in TG180 PCBs, the polymer remains rigid and less prone to deformation, ensuring improved stability and reliability under varying temperature conditions.

Importance of Using TG180 PCB for Temperature-Sensitive Applications

The unique properties and thermal resistance offered by TG180 PCBs make them highly suitable for temperature-sensitive applications. Electronic devices operating in environments with extreme temperatures, such as automotive, aerospace, or industrial applications, demand PCBs that can withstand and perform reliably under challenging thermal conditions.

TG180 PCBs ensure that the board can maintain its structural integrity, electrical performance, and mechanical stability even when subjected to high temperatures. These PCBs exhibit excellent thermal conductivity, minimizing the risk of overheating and enabling efficient heat dissipation. The high-Tg materials used in TG180 PCBs enhance thermal stress resistance, reducing the likelihood of delamination, warping, or cracking.

Furthermore, TG180 PCBs offer improved reliability for components exposed to high-temperature environments. Using high-Tg materials, the PCB can provide a stable and consistent platform for critical electronic components, ensuring their longevity and performance.

V. Features of High-Tg PCBs

High-Tg PCBs (with high glass transition temperature) offer a range of exceptional features that make them indispensable in the world of advanced electronics. These features enable high-Tg PCBs to withstand demanding thermal conditions while delivering reliable performance. Let’s explore the remarkable characteristics that set high-Tg PCBs apart:

High Heat Resistance

High-Tg PCBs are specifically designed to exhibit exceptional heat resistance. The materials used in their construction can withstand elevated temperatures without compromising the board’s structural integrity. This high heat resistance ensures that the PCB can operate reliably even in demanding environments characterized by extreme temperature fluctuations or exposure to heat-generating components.

Low Z-Axis Thermal Expansion Coefficient

High-Tg PCBs exhibit a low Z-axis thermal expansion coefficient, which refers to the minimal expansion or contraction of the board in the vertical direction when subjected to temperature variations. This characteristic is vital for maintaining the integrity of the PCB and its components, as it reduces the risk of stress-induced cracks or failures in solder joints. The low Z-axis thermal expansion coefficient ensures stability and reliability, particularly in applications with frequent temperature fluctuations.

High Reliability of Plated Through Holes (PTH)

Plated through holes (PTH) are essential for interconnecting the various layers of a PCB. High-Tg PCBs offer enhanced reliability of PTHs, particularly when exposed to thermal stress. The high-Tg materials’ robustness in these PCBs ensures that the plated-through holes maintain their integrity even under extreme temperature cycling or prolonged exposure to high temperatures.

Improved Mechanical Performance

High-Tg PCBs excel in terms of mechanical performance. The reinforced glass fibers and specialized resin systems used in their construction enhance mechanical strength and rigidity. This makes high-Tg PCBs less susceptible to warping, bending, or flexing under mechanical stress, ensuring the stability and longevity of the board. The improved mechanical performance of high-Tg PCBs translates into reliable performance in applications that involve physical vibrations or shocks.

Dimensional Stability

Dimensional stability is a crucial aspect of high-Tg PCBs. These boards exhibit minimal dimensional changes even when exposed to varying temperatures. The low coefficient of thermal expansion of high-Tg materials ensures that the PCB retains its shape and size, preventing the misalignment of components and maintaining precise interconnectivity. The dimensional stability of high-Tg PCBs is essential for ensuring the accuracy and reliability of electronic systems.

High Resistance to Thermal Stress

High-Tg PCBs are designed to withstand thermal stress effectively. They can endure rapid temperature changes and extreme thermal cycles without compromising their structural integrity. The specialized materials used in high-Tg PCBs provide exceptional thermal stress resistance, preventing delamination, solder joint failures, or material degradation. This feature ensures reliable performance and longevity, particularly in applications where temperature fluctuations are a concern.


Features of High-Tg PCBs
Features of High-Tg PCBs

VI. Benefits and Applications of TG180 PCB

Advantages of TG180 PCB

Enhanced Thermal Performance:

TG180 PCBs exhibit excellent heat resistance, allowing them to withstand elevated temperatures without compromising performance or structural integrity. This improved thermal performance ensures reliable operation even in high-temperature environments.

Improved Reliability:

With their low Z-axis thermal expansion coefficient and high resistance to thermal stress, TG180 PCBs provide increased reliability. They can endure thermal cycling and temperature fluctuations, minimizing the risk of cracks, solder joint failures, or component damage.


The high-Tg materials used in TG180 PCBs contribute to their long-term durability and extended lifespan. These PCBs can withstand demanding operating conditions, ensuring reliable performance over an extended period.

Mechanical Strength: 

TG180 PCBs offer improved mechanical strength and rigidity. They are less prone to warping, bending, or cracking under mechanical stress, providing stability and reducing the risk of physical damage.

Application Areas of TG180 PCB

Communication Equipment:

TG180 PCBs find applications in high-speed communication devices, such as routers, network switches, and data centers. Their thermal resistance and reliability ensure uninterrupted connectivity and performance.

Automotive Electronics:

In the automotive industry, where temperature variations and harsh conditions are prevalent, TG180 PCBs play a vital role. They are used in engine control units (ECUs), electronic control modules, and safety systems, offering reliable operation in demanding automotive environments.

TG180 PCB used in Automotive Electronics
TG180 PCB used in Automotive Electronics

Industrial Control Equipment:

TG180 PCBs are well-suited for industrial control equipment, such as programmable logic controllers (PLCs), power supplies, and motor drives. These PCBs provide the stability, durability, and thermal performance required for robust industrial applications.

TG180 PCB used in Industrial Control Equipment
TG180 PCB used in Industrial Control Equipment


Aerospace applications demand high reliability and resistance to extreme temperatures. TG180 PCBs are utilized in avionics systems, satellites, and other aerospace electronic components, ensuring optimal performance in challenging environments.

Medical Devices: 

Medical devices often require high reliability, precision, and stability levels. TG180 PCBs are used in various medical equipment, including patient monitoring systems, imaging devices, and diagnostic instruments, where temperature resistance is critical.

Military and Defense:

TG180 PCBs are employed in military-grade communication systems, radar equipment, and electronic warfare systems, delivering the necessary durability and reliability.

Other High-Temperature Applications:

TG180 PCBs are also used in other high-temperature applications, such as power electronics, renewable energy systems, and high-power LED lighting, where thermal management and long-term performance are paramount.

Importance of Stability and Temperature Resistance in PCBs

Stability and temperature resistance are fundamental considerations in PCB design and selection. PCBs must maintain structural integrity, electrical performance, and reliability over various operating temperatures. The stability of a PCB ensures consistent signal transmission, prevents dimensional changes, and minimizes the risk of failure due to thermal stress or environmental factors.

Temperature resistance is particularly critical in applications where electronics are exposed to extreme temperatures or thermal cycling. High-Tg PCBs like TG180 offer the necessary stability, reliability, and resistance to thermal stress, ensuring optimal performance under challenging thermal conditions. 

VIII. Conclusion

In the ever-evolving realm of printed circuit boards (PCBs), the significance of glass transition temperature (Tg) cannot be overstated. High-Tg PCBs have emerged as a pioneering solution, transforming PCB performance and dependability. Throughout this article, we have explored the realm of high-Tg PCBs, with a particular emphasis on TG180 PCBs, comprehending their definition, characteristics, design considerations, temperature impacts, and remarkable attributes.

The Tg of a PCB material is a pivotal parameter that determines its capacity to endure elevated temperatures without compromising its structural integrity. High-Tg PCBs, exemplified by TG180 PCBs, offer many distinct advantages. These PCBs exhibit remarkable heat resistance, a low Z-axis thermal expansion coefficient, substantial reliability of plated through holes (PTH), enhanced mechanical performance, dimensional stability, and an exceptional ability to withstand thermal stress. These attributes render high-Tg PCBs indispensable in diverse industries and applications. Astute deliberation is imperative when selecting the appropriate Tg materials for specific applications. Factors such as the operational temperature range, thermal conductivity requisites, mechanical strength, and compatibility with manufacturing processes must all be considered. By meticulously selecting the fitting Tg materials, designers and manufacturers can ensure optimum performance, reliability, and longevity of the PCBs in their respective applications.

The benefits and applications of high-Tg and TG180 PCBs are broad and varied. These PCBs find extensive utilization in communication equipment, automotive electronics, industrial control equipment, aerospace, medical devices, military and defense, and other applications characterized by high-temperature environments. Their capacity to withstand extreme temperatures bestows stability and deliver unwavering performance, endows them with indispensability in demanding settings where effective thermal management and durability are paramount.

In conclusion, the glass transition temperature (Tg) assumes immense significance in the PCB industry. High-Tg PCBs, such as TG180, offer many advantages and find application in diverse industries. The selection of suitable Tg materials assumes criticality in ensuring the reliability and performance of PCBs in specific applications. With their remarkable attributes, high-Tg and TG180 PCBs chart the path for advancements in electronic technology, fostering innovation and progress in manifold domains.

We hope this article has furnished valuable insights into the realm of high-Tg PCBs and their transformative influence on PCB performance and dependability. By embracing high-Tg PCBs, we can unlock new possibilities and transcend the frontiers of electronic design and functionality.

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