High-TG PCBs High Temperature PCB FR4 Material
What is the High TG PCB material
1. what is the TG? The critical temperature at which the substrate melts from solid to rubbery fluid is called Tg. There are three grades of materials:
| Parameter | Normal TG | Mid TG | High TG |
|---|---|---|---|
| Value | Tg≥130℃ | Tg≥150℃ | Tg≥170℃ |
2. High Tg printed circuit board is characterized by the increase of TG of the substrate, heat resistance, moisture resistance, chemical resistance, stability and other characteristics for the board will be increased and improved. The higher the TG value, the better the temperature resistance of the board, so high Tg is widely used in the process of HASL lead-free.
3. The advantage of high TG PCB is that with the development of science and technology, electronic products are developing towards high function and high multilayer, especially the development of high-density SMT technology. PCB is more and more dependent on the support of high heat resistance of substrate in terms of small aperture, fine circuit, and thin type. In addition, the mechanical strength, dimensional stability, adhesion, water absorption, thermal decomposition and thermal expansion of high TG materials are significantly better than ordinary PCB substrate materials at high temperature, especially after hygroscopic heating.
High-TG PCB Advanced Circuits Specification
The Glass Transition Temperature (Tg) is one of the most important properties of any epoxy and is the temperature region where the polymer transitions from a hard, glassy material to a soft, rubbery material.
Circuit board material must flame-resistant, it can’t be burned at a certain temperature and only be soften. The temperature point is called the glass transition temperature (Tg).
The higher Tg point means higher temperature requirement during lamination. And the boards will be hard and crisp, which will affect hole and the electrical properties.
Ordinary PCB materials at high temperatures, not only will be soften, deformation, melting and other phenomena, but also the mechanical and electrical properties decline sharply.
General fr4 Tg is 130-140 centigrade, moderate Tg is greater than 150-160 centigrade, High-Tg is greater than 170 degrees.
The higher of Tg, the better performance of PCB heat resistance, moisture resistance, chemical resistance, stability and other characteristics.
FR4 is a code name for grade of Epoxy Glass material.
Tg means Glass Transition Temperature.
When the working temperature reaches to the melting point, that means the temperature exceeds the Tg value, the status of pcb material will be changed from glassy to liquid, which will affect the function of pcb. And this value is related to the stability of the pcb dimension.
As usual, made with Tg ≥ 170℃ pcb material, which is called high Tg printed circuit board. With the rapid development of the electronics industry, high Tg material is widely used in computer, communication equipment, precise apparatus and instrument and etc.
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.
Pcbway offers some popular High Tg materials:
S1000-2 & S1170: Shengyi materials;
IT-180A: ITEQ material;
TU768: TUC material.
The specifications we can make, please check below:
Layer: 2-28 layers
Pcb size: Min. 10*15mm, Max.500*600mm
Finished board thickness: 0.2-3.5mm
Copper weight: 1/3oz-4oz
Surface Finish: HASL with lead /HASL lead free/Immersion gold/ Immersion silver/Immersion Tin/OSP-Organic Solderability Preservatives – RoHS
Soldermask: Green/Red/Yellow/Blue/White/Black/Purple/Matt Black/Matt Green
Silkscreen: White/Black
Min copper tracks/spacing: 3/3mil
Min holes: 0.1mm
Quality Grade: Standard IPC II
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