High Tg PCB
High Tg PCB
The substrate transitions from a ‘glassy state’ to a ‘rubbery state’ when the temperature rises to a certain range. This point is the board’s glass transition temperature (Tg). Tg is the maximum temperature (in degrees Celsius) at which the substrate maintains rigidity. Ordinary PCB substrate materials soften, deform, melt, and experience a sharp decline in mechanical and electrical properties at high temperatures.
The Tg of a material is typically above 130℃. High Tg materials are usually above 170 degrees Celsius, while medium Tg materials are approximately 150℃. PCBs with a Tg of 170℃ or higher are called high Tg PCBs.
Increasing the Tg of the substrate improves the heat, moisture, and chemical resistance, as well as the stability of the printed board. Higher Tg values indicate better temperature resistance of the material, especially in lead-free processes where high Tg applications are more prevalent.
Read the information below to learn more about what Tg means in the PCB industry.
The Features of High Tg PCB
- High heat resistance
- Low Z-axis thermal expansion coefficient
- High reliability of plated through holes (PTH)
- Improved mechanical performance
- Dimensional stability
- High resistance to thermal stress
Applications of High Tg PCB
Communication Equipment: High Tg PCBs are commonly used in communication equipment, such as
wireless base stations, fiber optic communication devices, and network equipment. These devices often require good electrical performance and reliability in high-temperature and high-frequency environments.
Automotive Electronics: In automotive electronics, high Tg PCBs are widely used in on-board computers, engine control units (ECUs), sensors, dashboards, and other critical systems. The interior of a car experiences significant temperature fluctuations, so circuit board materials capable of withstanding high temperatures and thermal stress are needed.
Industrial Control Equipment: High Tg PCBs are commonly used in industrial control equipment, automation systems, and robotics. These devices typically operate in high-temperature,high-humidity, and high-vibration environments, requiring excellent thermal stability and mechanical strength.
Aerospace: The aerospace industry demands high reliability and temperature resistance from electronic devices. High Tg PCBs are extensively used in aircraft, satellites, and navigation equipment to withstand extreme temperature changes and harsh working conditions.
Medical Devices: Medical equipment must operate under high-temperature sterilization and disinfection conditions. High Tg PCBs are employed in electronic monitoring devices, surgical instruments, medical imaging equipment, and implantable medical devices.
Military and Defense: Military and defense applications have stringent requirements for electronic devices’ reliability and temperature resistance. High Tg PCBs are used in radar systems, missile control, military communications, and tactical equipment, among other fields.
These are just some examples of the application areas for high Tg PCBs.High Tg PCBs can also be suitable for other applications with high-temperature requirements, such as industrial equipment, energy systems, and electronics operating in high-temperature environments. The exceptional thermal properties of high Tg PCBs make them versatile for a wide range of temperature-sensitive applications.
The High Tg Material used
| Material | TG（DMA,℃） | Td(Wt,℃) | CTE-z(ppm/℃) | td260(min) | Td288(min) |
| IT180A | 190 | 345 | 45 | 60 | 20 |
| TU768 | 190 | 350 | / | 60 | 15 |
| S1000-2 S1000-2B | 185 | 345 | 45 | 60 | 20 |
| S1170G S1170GB | 180 | 390 | 45 | 60 | 60 |
| QOGERS 4350B | 280 | 390 | 32 | / | / |
Mass production lead time
| lead time Level | Lead Time (Wroking days,ex-factory | |
| Urgent(Days) | Normal(days) | |
| 1、2L | 3 | 8-10 |
| 4L | 6 | 12-14 |
| 6、8L | 10 | 15-18 |
| 10L and up | To be determined based on case | |
The above lead time is based on:
1. Conventional Material
2. All engineering consultations are confirmed.
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