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High Tg PCB

When the temperature rises to a certain area, the base material (polymer or glass) is changing from a glassy, solid, and rigid state to a rubbery state, so the temperature at this time is called the glass transition temperature (Tg). In other words, Tg is the mechanical property that specifies the glass transition temperature, that is, the highest temperature at which the glass remains rigid.


Normal PCB FR4 Tg is 130-140℃, medium Tg is greater than 150-160℃, and high Tg is greater than 170℃. Compared with standard FR4, high FR4-Tg has better mechanical and chemical resistance to heat and humidity. The higher the Tg value, the better the heat resistance of the material. Therefore, especially in the lead-free process, the Tg is getting higher and higher.

Advantages of high Tg PCB

Higher stability: If you increase the Tg of the PCB substrate, it will automatically improve the heat resistance, chemical resistance, humidity resistance and device stability.

Withstand high power density design: If the device has a high power density and quite high heat, then a high Tg PCB will be a good solution for thermal management.

Ideal for multi-layer and HDI PCB: Since multi-layer and HDI PCB are more compact and circuit dense, it will result in a high level of heat dissipation. Therefore, high Tg PCB is usually used in multilayer and HDI PCB to ensure the reliability of PCB manufacturing.

With the rapid development of the electronics industry, high Tg materials are widely used in computers, communication equipment and precision instrumentation. In order to achieve high-function, high-multilayer development, PCB substrate materials require higher heat resistance as a prerequisite. Moreover, due to the emergence and development of high-density mounting technologies represented by SMT and CMT, the high heat resistance of the substrate becomes more and more inseparable in the case of thinning, small aperture, and fine wiring. Obviously, high TgP CB is better than ordinary PCB substrate materials. Therefore, in recent years, there is a great demand for high Tg PCB, but the price is higher than ordinary PCB.

When is high TgPCB required?

If the thermal load that your printed circuit board cannot withstand is not less than Tg25℃, your application will require a high Tg PCB. In addition, if your product operates in a temperature range of 130℃, to ensure safety, it is recommended that you use a high Tg PCB. Another main reason for using high TgPCB is the RoHS requirement. Therefore, more and more PCB industries are turning to high Tg materials because lead-free solders require higher temperatures.


High Tg PCB application areas

If the power density in the electronic product is higher and the heat will interfere with the heat sink or other parts of the product, then a high Tg PCB is the best solution. In addition, with the popularity of high Tg PCB in recent years, you will find that high Tg PCB is used in the electronics industry that can operate at higher temperatures. Therefore, we meet the needs of customers in different industries by providing high Tg PCBs with high heat resistance. These PCBs can meet customer specifications within a short delivery time. Therefore, they are widely used in: gateways, radio frequency identification, inverters, antenna boards, wireless boosters, contract manufacturing services, low-cost PLCs, embedded system development, embedded computer systems, AC power supplies.

We - Shenzhen PCB manufacturer – SysPCB can manufacture high Tg specifications, please check the following:

Number of layers: 1-14 layers
PCB size: minimum 10*15mm, maximum 500*600mm
Finished board thickness: 0.2-3.5mm
Copper weight: 1/3oz-4oz
Surface treatment: leaded HASL/lead-free HASL/immersion gold/immersion silver/immersion tin/OSP-organic solderability preservative-RoHS
Solder mask: green/red/yellow/blue/white/black/purple/matt black/matt green
Silk screen: white/black
Minimum line width/spacing: 3/3mil
Minimum aperture: 0.1mm
Quality level: standard IPCII