High TG PCB

Reliable High TG PCBs for High Temperature Performance

High TG PCB used for high-power, multilayer, and high-density circuit applications.
Surface finishes such as HASL with lead, lead-free HASL, immersion gold, silver, tin, and OSP.
Wide range of solder mask colors available.
Tg is 170 °C or higher than 170 °C
All High TG PCBs manufactured to IPC quality standard

High TG PCBs are specially designed circuit boards that provide excellent thermal stability, making them a top pick for high-temperature and high-power electronic applications. Thanks to their elevated glass transition temperature (TG), these PCBs keep their structural integrity and electrical performance intact, even when faced with extreme thermal stress. At SMTFAB, we provide robust High TG PCBs suitable for multilayer and high-density designs, ensuring long-lasting reliability and excellent mechanical properties.

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What is High TG PCB?

What is High TG PCB

These types of PCBs are built to handle the heat. When a board gets too hot, it can bend, melt, or just stop working right. That’s where glass transition temperature (Tg) comes in. Tg is the point when the board changes from stiff to soft.

A standard PCB starts softening around 130 to 150°C. But a high TG PCB stays solid even past 170°C. That higher Tg keeps the board stable. It resists heat, moisture, and chemicals better.

It also holds up well during soldering, especially in lead-free processes. If your design runs hot or works in tough spots, you’ll want that extra strength. More Tg means more heat resistance.

Key Features and Properties of High TG PCB

Has High Heat Resistance

They are specifically designed to withstand higher operating temperatures while maintaining their strength. This quality makes them perfect for high-power applications, multilayer circuit boards, and situations where they are exposed to heat for extended periods.

Durable Versus Delamination

The materials found in High TG PCBs are known for their outstanding resistance to delamination, even when faced with repeated thermal cycling or moisture absorption.

Reliable Plated Through Holes

High TG substrates play a vital role in boosting the mechanical and electrical stability of plated through holes (PTH), particularly during soldering or reflow processes. This reliability is essential for ensuring signal integrity and interlayer connectivity in complex, multi-layer PCBs.

Superior Mechanical Strength and Rigidity

These PCBs come with enhanced mechanical properties, boasting greater tensile and flexural strength. This added rigidity plays a crucial role in preventing issues like board warping, cracking, or mechanical failure, especially in high-demand fields such as automotive, aerospace, and industrial electronics.

Consistent Dimensional Accuracy

High TG materials offer improved dimensional stability when faced with thermal and environmental stress. This reliability is crucial for fine-pitch components and high-density interconnects, as even the tiniest expansion can throw off alignment and impact performance.

Strong Resistance to Thermal Stress

Engineered to withstand the rigors of repeated heating and cooling cycles, High TG PCBs are tough against the mechanical and electrical wear that can happen from thermal stress. This durability makes them a go-to option for lead-free soldering and various high-temperature manufacturing processes.

Common High TG PCB Materials

When you’re selecting a high Tg PCB, it’s important to pick a material that fits your specific needs, especially in high-temperature applications. High Tg PCBs are made from special materials that can handle temperatures beyond the standard FR4. But what common high Tg PCB materials are available to choose from? Let’s break it down and look at some of the top materials you can consider.

Common High TG PCB Materials

IT-180A – 190°C
TU768 – 190°C
S1000-2 – 180°C
S1000-2B – 180°C
S1170G – 180°C
S1170GB – 180°C
Rogers 4350B – 280°C
Isola FR370HR – 180°C
Isola P95 – 260°C
Isola I-Speed – 180°C
Isola I-Tera MT40 – 200°C
Isola Tachyon-100G – 192°C
Nelco N4000-13SI – 210°C
Nelco N4800-20 – 180°C
Rogers N4380-13RF – 200°C
Rogers RO4003C– 280°C

The higher the Tg, the better it handles heat, so choose one that fits your application needs.

Advantage of High TG PCB

High Tg PCBs are crucial when you’re dealing with elevated temperatures or tricky thermal loads. These materials come with a higher glass transition temperature (Tg), which means they offer better thermal stability and structural integritywhen exposed to heat for extended periods.

By increasing the Tg of the substrate, you enhance the overall dimensional and chemical stability of the board. This improvement also means better resistance to moisture absorption, which helps lower the chances of delamination or dielectric breakdown during thermal cycling.

For designs that require high power density, high Tg PCBs really shine with their excellent heat tolerance. When components kick out a lot of thermal energy, these boards effectively spread that heat across the surface and through the substrate, reducing the risk of localized overheating and ensuring the circuit remains reliable.

In cases where redesigns are necessary due to thermal constraints, high Tg substrates can help avoid the need for larger or more complicated layouts. Rather than enlarging the board or changing the power profile, simply switching to a high Tg material can allow you to handle higher thermal thresholds without altering the existing design parameters.

These PCBs areapplicable to Multilayer and HDI electronics, which feature compact layouts and dense interconnections, inherently generate higher thermal concentrations. High Tg materials are well-suited for these configurations. They provide the necessary mechanical strength and thermal endurance to maintain reliability throughout the product lifecycle.

Applications of High TG PCB

You’ll usually see High TG PCBs in devices that run hot or work nonstop. These systems often deal with high power and tight spaces, which can heat up fast. High TG PCBs help control that heat and keep everything running smoothly. If a product needs to stay stable under heat or stress, there’s a good chance it uses a High TG PCB. Here’s the common applications of it:

AC Power Supplies
Antenna
ADAS systems
Embedded Computer Systems
Gateway
Inverter
Low-Cost PLC
RFID
Wi-Fi Booster

Why Choose SMTFAB to Manufacture Your High-TG PCBs?

SMTFAB has over 20 years of experience in High Tg PCB production as a PCB manufacturer. We can provide you with reliable solutions to ensure that your PCBs can withstand tough thermal conditions without affecting performance.

We maintain an inventory of materials and use high quality materials known for their excellent thermal stability. We also manufacture in strict compliance with IPC quality standards. Whether you need rapid prototyping or high-volume production, our flexible manufacturing capabilities and expert technical support ensure that you receive customized, high-quality service.

If you have a high tg pcb project, contact us now for a free quote and let SMTFAB help you realize your PCB project.

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From selecting the right high Tg material to providing expert design feedback, SMTFAB ensure your boards perform reliably even in demanding thermal environments. We manufacture PCBs for high-density power systems, multilayer HDI designs, or compact consumer electronics that needs high TG capabilities. We’re equipped to handle complex builds with precise tolerances, advanced layer stacks, and specialized surface finishes. From low-volume prototypes to high-volume runs, we offer consistent quality, dependable delivery, and full technical support.

Frequently Asked Questions

Is the PCB TG Higher the Better?

The answer is yes—and no.

Yes, higher TG means better heat strength. Your PCB stays strong when it gets hot. It holds shape. It doesn’t absorb water. It resists breaking down. If your board goes in something hot—like high-power stuff—high TG helps a lot. Smaller, thinner parts get hotter faster. So, yeah, in many cases, a higher TG helps.

But here’s the thing. Making high TG boards is harder. You need more heat to stick the layers. That makes the board stiff. It also gets more brittle. And honestly, it’s harder to drill clean holes through it.

Still, if you work on something big—something with power—high TG PCBs are worth it. They handle stress better. They hold up longer. Especially if you’re stacking 10 layers or more. That’s where high-end FR4 and high TG go hand-in-hand.

What are the Types of Tg Temperature?

General Tg (Tg135°C) – This is for basic boards. It’s used in consumer electronics and everyday gadgets.
Medium Tg (Tg150°C) – A bit stronger. It works better when things run a little hotter or longer.
High Tg – These are built for heat-heavy jobs and tough environments.

1. 1. Tg170 – Handles automotive and industrial machines. More stable than regular boards.
  2. Tg180 – Great for telecom gear and reliable consumer tech. Stays strong under more stress.
  3. Tg200 – Meant for aerospace and high-end industrial tools. It holds up well under pressure.
  4. Tg260 – Built for extreme environments. Perfect for high-power electronics.
  5. Tg300 – Top-of-the-line stuff. Used in satellites, military systems, and other critical devices.

What is the Difference of TG and TD?

You might see TG and TD when choosing your PCBs. TG means Glass Transition Temperature. This is the point where your board starts to soften. Below that temp, the board stays stiff and strong. Once it hits TG, the material turns flexible, almost like plastic. But here’s the thing—it’s reversible. Let it cool down, and the board turns stiff again.

TD means Decomposition Temperature. This one’s way more serious. It’s the temp where your board starts to break down for good. The material loses its strength and starts to fall apart. And no, it doesn’t go back to normal afterward. That’s permanent damage. You don’t want that.

So what does this mean for you? TG tells you how hot the board can get before softening. TD tells you how hot it can get before it’s ruined. For high-temp jobs—like lead-free soldering or power electronics—you want both TG and TD to be high. That way, your board holds up strong under stress, heat, and long use.

What is the Tg of FR4?

For standard FR4, it’s usually around 130 to 140°C. That’s the point where the board softens up a bit. But it doesn’t stop there. Some FR4 types can take more heat. Mid-Tg FR4 goes around 150 to 155°C. If you need more heat resistance, high-Tg FR4 can handle 170 to 185°C.

Can I solder a high TG PCB with regular tin-lead solder?

Yes, you can. It’s totally okay to use standard tin-lead solder on a high TG PCB. The board is made to handle more heat, but that doesn’t mean it needs higher heat all the time. So even if you use regular solder, it still works well. The high TG just gives you extra protection. It helps when things get hot during rework or long-term use. The board stays stable, strong, and safe. It won’t warp or crack easily. So, using tin-lead solder is fine.