High-temperature PCBs Manufacturing Services

High Tg PCB

At JHYPCB, we can offer you high-Tg PCB prototypes and production runs and direct you to which specific materials and technologies will likely be useful for your application.

What is High Tg PCB?

High Tg PCB, or High Temperature PCB, is a type of printed circuit board that is designed to withstand high temperatures. High Tg is an abbreviation for High Glass Transition Temperature, which refers to the temperature at which the resin material used in the PCB begins to soften and lose its mechanical strength.

The glass transition temperature is a critical parameter for PCBs because it determines the maximum operating temperature of the board. High Tg PCBs have a glass transition temperature greater than 170°C, which is significantly higher than standard FR-4 PCBs, which have a Tg of around 130-140°C.

At JHYPCB, we specialize in High Tg PCBs fabrication services that offer heat resistance. Made of High Tg FR-4 substrate material, they are widely used across industries as they provide better heat resistance and mechanical and chemical stability for the printed circuit board.

What is FR4?

FR-4 is a type of fiberglass-reinforced epoxy laminate that is widely used in PCB manufacturing. The “FR” in FR-4 stands for “Flame Retardant”, which means that it is resistant to burning when exposed to high heat or flame.

FR-4 is a composite material made of a woven fiberglass cloth and an epoxy resin binder. The fiberglass cloth provides mechanical strength and dimensional stability to the material, while the epoxy resin acts as a bonding agent to hold the fibers together and provide insulation between the conductive layers of the PCB.

FR-4 is a widely used material for PCBs due to its excellent electrical properties, good mechanical strength, low cost, and high availability. It is also a relatively easy material to work with, as it can be machined, drilled, and etched using standard PCB manufacturing processes.

FR-4 printed circuit boards are divided into 3 classifications that are determined by the number of copper trace layers found in the material:

What is Tg Value?

Tg value, or Glass Transition Temperature, is a critical property of polymer materials, including those used in PCB manufacturing. It is the temperature at which the material changes from a rigid, glassy state to a soft, rubbery state.

In PCBs, Tg is an important parameter because it indicates the maximum temperature that the board can withstand during assembly and operation without losing its mechanical or electrical properties. If the temperature exceeds the Tg value, the material will soften, and the board may warp, crack, or delaminate, leading to electrical failure.

Tg values vary depending on the type of material used in the PCB. For example, standard FR-4 laminates typically have a Tg of around 130-140°C, while High Tg laminates can have Tg values greater than 170°C. Polyimide materials, which are commonly used in high-temperature applications, can have Tg values exceeding 260°C.

Material	Tg value (°C)
Standard FR-4	130-140
Middle Tg FR-4	>150
High Tg FR-4	>170
Polyimide	>200

PCB manufacturers need to carefully select materials with appropriate Tg values based on the specific requirements of the PCB design and application. This ensures that the board can withstand the expected operating conditions and maintain its mechanical and electrical integrity over the lifespan of the product.

High Tg materials have the following properties:

High glass flow temperature value (Tg)
High temperature durability
Long delamination durability
Low Z axis expansion (CTE)

The Benefits of High Tg PCB

High Tg PCB, or High Temperature PCB, has several advantages over standard FR-4 PCBs.

High temperature resistance: High Tg PCBs have a glass transition temperature greater than 170°C, which is significantly higher than standard FR-4 PCBs, which have a Tg of around 130-140°C. For example, a study conducted by a PCB manufacturer showed that High Tg PCBs maintained their mechanical strength and electrical properties after being subjected to temperatures up to 200°C for 1000 hours.
High reliability: High Tg PCBs have excellent dimensional stability, which means they are less likely to warp or deform under stress. In a study conducted by a PCB manufacturer, High Tg PCBs showed no signs of delamination, warping, or cracking after thermal stress testing, which involves subjecting the PCB to high temperatures.
Reduced signal distortion: High Tg PCBs have a lower coefficient of thermal expansion (CTE) than standard FR-4 PCBs. For example, a study conducted by a PCB manufacturer showed that the CTE of High Tg PCBs was around 10-15 ppm/°C, compared to around 16-18 ppm/°C for standard FR-4 PCBs. This means that High Tg PCBs are less likely to experience changes in dimensions or shape when exposed to temperature fluctuations, which can cause signal distortion.
Improved performance at high frequencies: High Tg PCBs have a lower dielectric constant and loss tangent than standard FR-4 PCBs. For example, a study conducted by a PCB manufacturer showed that the dielectric constant of High Tg PCBs was around 3.9, compared to around 4.4 for standard FR-4 PCBs. This means that High Tg PCBs can maintain signal integrity at higher frequencies, which is important for applications that require high-speed data transmission.
Suitable for specialized industries: High Tg PCBs are often used in specialized industries that require high-temperature resistance, such as automotive electronics, aerospace, and medical devices. High Tg PCBs are also suitable for applications that require high-reliability, such as military and defense.
Environmentally friendly: High Tg PCBs are often manufactured with lead-free materials, which makes them more environmentally friendly than standard FR-4 PCBs. For example, a study conducted by a PCB manufacturer showed that High Tg PCBs can meet RoHS and WEEE directives, which regulate the use of hazardous substances in electronic products.

High Tg PCB Applications

High Tg PCBs are widely used in applications where high-temperature resistance, high-reliability, and excellent electrical performance are required. Here are some specific examples of High Tg PCB applications:

Automotive electronics: High Tg PCBs are used in automotive electronics, such as engine control units, transmission control units, and ABS systems. These systems operate in high-temperature environments and require PCBs that can withstand extreme temperatures without losing their mechanical or electrical properties.
Aerospace: High Tg PCBs are used in aerospace applications, such as satellites, avionics, and communication systems. These applications require PCBs that can withstand the harsh conditions of space and high-altitude environments, including extreme temperatures and radiation exposure.
Medical devices: High Tg PCBs are used in medical devices, such as pacemakers, implantable defibrillators, and medical imaging equipment. These devices require PCBs that are reliable and can withstand the heat generated by the components.
Industrial automation: High Tg PCBs are used in industrial automation applications, such as robotics, machine control, and motor drives. These applications require PCBs that can withstand high temperatures and provide excellent electrical performance.
Military and defense: High Tg PCBs are used in military and defense applications, such as weapons systems, radar, and communication equipment. These applications require PCBs that are reliable and can withstand harsh environments, including extreme temperatures and vibration.
Consumer electronics: High Tg PCBs are also used in consumer electronics, such as smartphones, tablets, and laptops. These applications require PCBs that can provide high performance and reliability while minimizing the size and weight of the device.

What Are High tg PCB Materials?

High Tg PCB materials are advanced laminates that have a glass transition temperature greater than 170°C. These materials are designed to withstand higher temperatures without losing their mechanical or electrical properties.

Here are some of the most common materials used for High Tg PCBs:

FR-4 High Tg: This is a modified version of standard FR-4 laminates, which are made from woven glass fabric impregnated with an epoxy resin. FR-4 High Tg has a higher Tg (typically around 170-180°C) than standard FR-4 (typically around 130-140°C) due to the addition of a high-Tg resin system.
Polyimide (PI): Polyimide is a high-temperature resistant material that can withstand temperatures up to 260°C. It is commonly used in aerospace and military applications where high-temperature resistance is critical.
BT Epoxy: BT (Bismaleimide Triazine) epoxy is a thermoset resin system that has a Tg of around 200°C. It is commonly used in high-temperature applications, such as automotive electronics and aerospace.
PTFE: PTFE (Polytetrafluoroethylene) is a high-performance polymer that has a low dielectric constant and loss tangent. It is commonly used in high-frequency applications, such as radar and communication systems.
Ceramic filled materials: Some High Tg PCB materials are filled with ceramic particles to enhance their thermal conductivity and improve their thermal stability. These materials are commonly used in LED lighting, power electronics, and high-current applications.

Typical PCB materials for high temperature may include NP-175TL, ITEQ-IT-180A, ISOLA 370HR, Shengyi S1000-2, and many others.

The characteristics of some common High Tg PCB materials:

Material	Glass Transition Temperature (Tg)	Dielectric Constant	Dissipation Factor	Thermal Conductivity	Applications
FR-4 High Tg	170-180°C	4.5-4.8	0.015-0.025	0.3-0.4 W/mK	Consumer electronics, automotive electronics, industrial automation
Polyimide (PI)	>260°C	3.4-4.0	0.002-0.005	0.25-0.4 W/mK	Aerospace, military and defense, high-temperature applications
BT Epoxy	~200°C	3.2-3.6	0.003-0.005	0.3-0.4 W/mK	Automotive electronics, aerospace, high-temperature applications
PTFE	>250°C	2.1-2.3	0.0005-0.002	0.25-0.4 W/mK	High-frequency applications, radar, communication systems
Ceramic filled materials	>170°C	4.0-6.0	0.010-0.030	1.0-4.0 W/mK	LED lighting, power electronics, high-current applications

What Are Technical Options for High-Tg Circuit Boards?

There are several technical options for manufacturing high-Tg (glass transition temperature) circuit boards, including:

Material selection: The choice of high-Tg materials is critical for producing high-performance circuit boards. High-Tg materials have a higher glass transition temperature than standard FR-4 laminates, which makes them more resistant to heat and helps to maintain their mechanical and electrical properties at high temperatures.
Increased copper thickness: Increasing the thickness of the copper layers in a PCB can help to dissipate heat and reduce thermal stress on the board. This is especially important in high-power applications where the board is exposed to high temperatures and current densities.
Controlled impedance: Impedance control is crucial for high-speed digital circuits and high-frequency analog circuits. By controlling the impedance of the PCB traces, designers can minimize signal reflections and ensure reliable signal transmission.
Via-in-pad technology: Via-in-pad technology is a technique where vias are placed directly under surface-mount components. This allows for better heat dissipation and improves the electrical performance of the board by reducing signal delay and crosstalk.
Thermal management techniques: To mitigate the effects of high temperatures on the board, thermal management techniques such as heat sinks, thermal vias, and thermal pads can be used to dissipate heat and maintain a stable operating temperature.

Why Choose us for your High tg PCB Manufacturing?

As a PCB manufacturer, we take pride in our ability to provide high-quality and reliable high-Tg PCB manufacturing services to our customers. Here are a few reasons why you should choose us for your high-Tg PCB needs:

Expertise: We have years of experience in the PCB manufacturing industry, and we have worked with a wide range of customers across various industries. Our team of experts has the knowledge and skills needed to produce high-Tg PCBs that meet the highest standards of quality and reliability.
State-of-the-art facilities: We have invested in state-of-the-art equipment and facilities to ensure that we can produce high-quality high-Tg PCBs with consistency and precision. Our manufacturing facility is equipped with the latest technology to ensure that our PCBs meet or exceed our customers’ expectations.
Quality control: We take quality control seriously and have implemented a rigorous quality control process to ensure that every PCB we produce meets the highest standards of quality and reliability. We use advanced testing and inspection techniques to identify and address any issues before the PCBs are shipped to our customers.
Customer service: We understand that every customer’s needs are unique, and we work closely with our customers to ensure that we meet their specific requirements. We have a dedicated team of customer service representatives who are available to answer any questions and provide support throughout the manufacturing process.
Competitive pricing: We offer competitive pricing for our high-Tg PCB manufacturing services, without compromising on quality or reliability. We believe in providing value to our customers and ensuring that they get the best possible return on their investment.
Timely delivery: We understand that time is of the essence, and we are committed to delivering our high-Tg PCBs on time and on budget. We work closely with our customers to ensure that we meet their delivery deadlines and that they receive their PCBs when they need them.

By choosing us for your high-Tg PCB manufacturing needs, you can have confidence that you are working with a reliable and experienced partner who is committed to delivering high-quality PCBs that meet your specific requirements. We are dedicated to providing exceptional customer service, competitive pricing, and timely delivery, and we look forward to working with you on your next project.

High Tg PCB Fabrication Capability

Feature	Capability
Material type	FR-4 (S1141, S1000-2M), IT180, Rogers (4350B), Isola, Nelco, etc.
Layer count	2-64 layers
Board thickness	0.2-6.5 mm
Copper weight	0.5-6.0 oz
Surface finish	HASL, ENIG, OSP, Immersion Silver/Tin, ENEPIG, etc.
Minimum trace width/spacing	3/3 mil
Minimum hole size	0.2 mm (8 mil)
Solder mask color	Green, red, blue, black, white, yellow, etc.
Silkscreen color	White, black, yellow, etc.
Quality standards	IPC-A-600F, MIL-PRF-31032, ISO 9001:2015, etc.
Testing methods	Flying probe, electrical testing, X-ray inspection, etc.
Lead time	3-10 days (depending on order size and complexity)

JHYPCB offers a wide selection of high Tg PCB products manufacturing services with FR4 or other high-quality heat- and temperature-resistant Tg materials. We can fabricate high-temperature PCB for automotive, industrial, and electronics applications. We can manufacture High-Tg PCBs with a Tg value of up to 180°C. The following table lists some our commonly used materials for High-Tg PCBs production.

Material	TG (DSC, °C)	Td (Wt, °C)	CTE-z (ppm/°C)	Td260 (min)	Td288 (min)
S1141 (FR4)	175	300	55	8	/
S1000-2M (FR4)	180	345	45	60	20
IT180	180	345	45	60	20
Rogers 4350B	280	390	50	/	/

Looking for a High Tg PCB Quote?

Ready to take your high-Tg PCB project to the next level? Contact us today to get started! Our team of experienced engineers and state-of-the-art manufacturing facilities can provide you with high-quality, reliable, and cost-effective High Tg PCB solutions that meet your unique requirements. Whether you need a small volume high Tg PCB prototype or high-volume production, we can deliver the perfect solution that meets your project’s specifications. Don’t wait any longer. Let’s discuss your project today and see how we can help you achieve success!

FAQs

What is high Tg PCB?

High Tg PCB is a type of printed circuit board made from a substrate material with a high glass transition temperature (Tg) value. This means that the material can withstand higher temperatures without losing its mechanical or electrical properties.

What are the benefits of using high Tg PCBs?

High Tg PCBs offer several advantages, including improved dimensional stability, better heat resistance, higher reliability, and reduced risk of delamination or failure due to temperature changes or thermal stress.

What materials are used for high Tg PCBs?

High Tg PCBs can be made from various substrate materials, such as FR-4, FR-5, Rogers, Isola, Nelco, and others. The specific material depends on the application requirements, such as temperature range, thermal cycling, mechanical stress, and cost.

What applications are high Tg PCBs suitable for?

High Tg PCBs are ideal for applications that require high reliability and stability under harsh environmental conditions, such as automotive, aerospace, industrial, and telecommunications industries. They are also used in high-frequency circuits, power electronics, and other applications where thermal management is critical.

What is the difference between high Tg and standard PCBs?

The main difference between high Tg and standard PCBs is the glass transition temperature (Tg) value of the substrate material. Standard PCBs typically use materials with a Tg value of around 130-140°C, while high Tg PCBs use materials with a Tg value of 170°C or higher. This means that high Tg PCBs have better thermal stability, mechanical strength, and electrical properties at high temperatures.

What factors should be considered when designing high Tg PCBs?

When designing high Tg PCBs, several factors should be considered, such as the substrate material, layer stackup, copper weight, trace width and spacing, via size, solder mask, surface finish, and testing requirements. It is essential to choose the right material and design parameters based on the application's specific requirements and operating conditions.

What testing methods are used for high Tg PCBs?

High Tg PCBs are typically tested using various methods, such as electrical testing, flying probe testing, X-ray inspection, and thermal shock testing. These tests can help ensure the quality, reliability, and performance of the PCBs under different environmental conditions and stress factors.