High TG PCB - High Temerature Circuit Board for PCB applications that requires high temperature.

JHYPCB is specialized manufacturers from China, High-Temperature Circuit Board, High TG PCB supplier, and factory, provides high-quality products of High TG Circuit Board manufacturing service, we have the perfect after-sales service and technical support.Look forward to your cooperation!

Lifting The Mystery of High TG PCB Circuit Board

High-Tg PCB Circuit Board


In recent years, there are more and more customers request to manufacture PCB with high Tg.

If you work with Printed Circuit Boards in your industry, you may or may not be familiar with the high-TG PCBs. Since the effective operation of your printed circuit boards is so essential to your business, it may be in your best interest to understand a little bit more about high-TG printed circuit boards.

What Is High-TG Printed Circuit Board ?

Tg means Glass Transition Temperature. As the flammability of the printed circuit board (PCB) is V-0 (UL 94-V0), so if the temperature exceeds designated Tg value, the board will be changed from glassy state to rubbery state. Then the function of PCB will be affected.

If the working temperature of your product is higher than usual (130-140C), then have to use high Tg material, which is > 170C. And popular PCB high value is 170C, 175C, and 180C. Usually, the PCB Tg value should be at least 10-20C higher than the working temperature of the product. If you 130TG board, the working temperature will be lower than 110C; if you use 170 high TG board, then the maximum working temperature should be lower than 150C.

High TG PCB Advantages

  • High glass flow temperature value (TG)
  • High-temperature durability
  • Long delamination durability
  • Low Z-axis expansion (CTE)

When Do You Need a High-Temperature Circuit Board ?

You need a high-temperature circuit board for your applications if your PCB will be experiencing a thermal load no higher than 25 degrees Celsius below the TG. If your product is operating in the 130-degree Celsius range or higher, you will want to use a high-TG PCB to be safe. The main reason for the Hi TG PCB is because of the movement to RoHS PCBs. It is causing most of the PCB industry to move toward Hi TG materials because of the higher temperatures needed for the lead-free solder to flow.

High TG PCB Materials

The high-temperature resistant PCB can help PCB assembly smoothly

At JHYPCB, we offer Complete PCB Assembly solutions for all types of High-Quality PCB Fabrication and High-Quality PCB Assembly requirements. Among the most common special requirements for PCB Fabrication is the need for high-temperature tolerance to withstand demanding operating conditions and/or environments.

We often encounter questions from our clients about the temperature requirements for the PCB Assembly Process itself, and whether or not a specific material selection will be required for Lead-Free PCB Assembly. Since our facilities are all fully RoHS Compliant, all of our default materials are suited to the higher Reflow Soldering temperatures of lead-free processes. You never have to worry about selecting a more robust heat profile for the production process itself, but in some cases, the finished boards must operate at high-temperature levels for prolonged periods. In this case, we provide a selection of PCB Materials that can meet your specific needs.

Fr-4, code for grades of fire-resistant materials

Temperature profiles for PCB material are generally expressed through the Tg (Glass Transition Temperature) of the material. This metric notes the temperature at which the stiff, glass-like polymer softens and is subject to warping or other physical defects. If you do not specify a minimum Tg level for your boards in your PCB Design Files, we will generally use our default Tg 140 FR4 material, which is sufficient to withstand the reflow soldering process and the majority of standard operating conditions.

We also offer higher Tg materials for your convenience, such as Tg 170 FR4 material, and IT180A with a characteristic Tg 180. We still provide all of our Standard PCB Options with high-Tg boards, so you will not have to worry about changing your design as a result of this material selection.

What Is FR-4 ?

FR-4 is a grade designation for flame-retardant fiberglass reinforced epoxy material. Thus, FR-4 PCB offers a much greater level of resistance to heat than a standard PCB. FR-4 circuit boards are divided into four classifications that are determined by the number of copper trace layers found in the material:

• Single-sided PCB / Single-layer PCB
• Double-sided PCB / Double-layer PCB
• Four or more than ten layer PCB / Multilayer PCB

The characteristics of High Tg materials are listed below:

  • Higher heat resistance
  • Lower Z-axis CTE
  • Excellent thermal stress resistance
  • High thermal shock resistance
  • Excellent PTH reliability
  • JHYPCB offers some popular High Tg materials
  • S1000-2 & S1170: Shengyi materials
  • IT-180A: ITEQ material
  • TU768: TUC material

Applications for High-Temp PCBs

High temperatures can be disastrous for unprotected PCBs, damaging dielectrics and conductors, creating mechanical stresses due to differences in thermal expansion rates, and ultimately causing everything from inconsistent performance to total failure. If your applications are in any danger of subjecting your PCBs to extreme temperatures or the PCB is required to be RoHS Compliant, it will be in your best interest to look into high-TG PCBs.

  • Multilayer PCB boards with many layers
  • Industrial electronics
  • Automobile electronics
  • Fineline trace structures
  • High-temperature electronics

Considerations for Heat Dissipation

High-TG PCBs will be critical when you are looking to protect your printed circuit boards from the high temperatures of your application`s process or during the extreme temperatures of lead-free assembly. Still, you will naturally want to consider multiple methods of drawing the intense heat generated by electronic applications away from your board.

There are three considerations for dissipating the high heat generated by the action of electronics with printed circuit boards: convection, conduction, and radiation.

  • Convection

Convection heat transfer is the process of transferring heat to air or water to allow it to flow away from an area – for example, when fluid absorbs heat and flows to a heat sink where it cools. Convection can also refer to the use of a fan or pump to force air over the surface, drawing heat away with it.

In most printed circuit boards, you will find a convection system where convection, usually including a cooling air fan, bears the heat through thermal vias to large, emissive heat sinks connected to conductive backings.

  • Conduction

Conduction heat cools by putting the heat sink in direct contact with the heat source, allowing the heat to flow away from the source, much like an electrical current flows through a system.

  • radiation

Designers dissipate radiation heat by making sure to design a direct path for electromagnetic waves to flow away from the source. Although electromagnetic wave radiation does not generate a tremendous amount of heat, if the board is designed to put reflective surfaces in the path of these waves, it can cause a rebound effect and significantly magnify the amount of heat that radiation generates on the board.

You can see that the more heat you need to deal with, the more it affects the design of the board. Reducing power density can limit the effectiveness of your product while adding heat sinks, and fans can increase size, weight, and cost. This is why, even if you are aware of other effective methods of heat management, it can be an excellent idea to look into high-TG materials as part of your overall heat control solution.

Technical options for High-Tg circuit boards


The CTE value shows the thermal expansion of the base material. CTE-z represents the z-axis and is e.g., due to the stability of the vias, of high importance. A higher Tg value favors a low CTE-z value, which represents the full expansion in the z-axis. Errors like pad lifting, corner cracks, and cracks within the via can be prevented through a low CTE-z value.

FR4 and FR4 High-tg z-axis enlargement

T260 - T288 value, Td

The decomposition temperature Td of a resin system depends on the binding energies within the polymers, and not on the glass transition temperature Tg. A good indicator for this characteristic is the T260 or T288 value, which specifies the time until delamination at 260°C or 288°C, respectively.

A critical indicator of the heat resistance is the time-to-delamination at a specific temperature. This test is preferably performed at 260 °C or 288 °C. The T260- or T288-value is the time to delamination of the tested material at 260 °C or 288 °C, respectively.

Td: Temperature-of-decomposition indicates the temperature at which the base material has lost 5% by weight and is an essential parameter for the thermal stability of base material. By exceeding this temperature, an irreversible degradation and damage to the content by the decomposition occurs.

High TG PCB Manufacturer and manufacturing capability

JHYPCB can manufacture High-Tg Circuit Boards with a Tg value of up to 180°C.

Meanwhile, we can also provide customers with metal-based PCB with excellent heat dissipation performance, such as aluminum PCB, LED PCB Circuit Board, Metal Core PCB, Copper-based PCB, etc.

We used below High Tg materials usually; if you need Data Sheet, please contact us directly.

(DSC, °C)(Wt, °C)(ppm/°C)(min)(min)
S1141 (FR4)175300558/
S1000-2M (FR4)180345456020
Rogers 4350B28039050//
If you want to know more information, please contact sales@pcbjhy.com.
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