Все о печатных платах с высоким Tg

The influence of high temperatures on electronic devices and PCB materials is quite evident. In elevated-temperature environments, PCB materials are susceptible to thermal expansion and contraction, which can lead to variations in electrical performance and significant changes in material characteristics. This situation further exacerbates the challenge of maintaining reliability in high-power applications. However, certain applications require high power to ensure the proper functioning of devices, thus necessitating a solution for addressing the issue of internal electronic overheating. To tackle these challenges, High Tg PCB has emerged as an effective solution.

What is High Tg PCB Board

Tg, or Температура перехода стекла, represents the temperature at which a material transitions from a rigid, brittle state to a flexible, elastic state. For PCB, a high Tg PCB signifies that it can operate at higher temperatures without deformation and without altering its electrical and mechanical characteristics due to temperature changes. To understand High Tg PCB, one must first comprehend the pivotal role of material selection.

Take FR4, for instance, which can have Tg values ranging from 130°C, 150°C, to 170°C, among other options. These values are achieved by adjusting processes and material ratios. Generally, a material with a Tg value exceeding 170°C is considered a High Tg material. It’s essential to emphasize that these temperature values do not represent the operating temperature of the printed circuit board but rather the critical temperature at which it transitions from a rigid to a flexible state. The actual operating temperature of the PCB is influenced by multiple factors, with the Tg value being just one aspect.

Certainly, the advantages of High Tg PCB extend beyond this. In comparison to standard PCB, High Tg PCB substrates with increased glass transition result in improved resistance to moisture, chemical durability, and more.

Why High Tg PCB Benefit You

The advantages of High Tg PCB lie in their ability to maintain structural stability in high-temperature environments, making it one of the primary reasons why users opt for them. In industrial settings, many devices are required to deliver high power, which results in the generation of significant heat during operation. These elevated temperature conditions can potentially impact circuit boards, leading to a degradation in circuit performance and, in some cases, aging and damage issues.

In particular, industrial control equipment relies heavily on core components, often in the form of control boards. These boards feature high complexity and functional demands, and they can be quite expensive. If these boards cannot operate reliably in high-temperature conditions, it could result in equipment failures, leading to substantial economic losses.

While metal core PCB perform well in high-temperature environments, they are challenging to process and come with higher costs, which may not be practical when dealing with complex projects. On the other hand, traditional ПЕЧАТНАЯ ПЛАТА FR4 materials, while capable of achieving multi-layer circuit constructions, have an operating temperature of only around 100°C. This might not meet the requirements of high-temperature environments, necessitating a change in material composition to attain a higher Tg value, transforming them into high temperature PCB board. This transition provides better high-temperature resistance, reducing the risk of performance degradation and equipment failures caused by high temperatures and subsequently lowering maintenance and replacement costs.

High Tg PCB Material

According to the definition, any material that transitions from a brittle state to a flexible and elastic state at a higher temperature falls under the category of High Tg PCB. There are several different materials available for users, including:

  • Polyimide (PI): A high-performance polymer known for its outstanding heat stability, electrical insulation properties, mechanical strength, and chemical stability. Its Tg value typically exceeds 260 °C, making it suitable for both жесткая печатная плата и гибкая печатная плата.
  • BT Epoxy Resin: Made from bismaleimide-triazine epoxy resin, it exhibits excellent high-frequency performance, low dielectric loss, and chemical stability. Its Tg value typically falls in the range of 200 °C to 250°C.
  • PTFE: A high molecular weight polymer with high chemical inertness that can adapt to various challenging environments. Its working temperature can reach up to 260 °C. While PTFE PCBs possess excellent properties, they can still be modified within the original formulation by adding ceramic particles to enhance hardness and thermal conductivity.
  • 370HR: Isola offers a high-performance FR-4 multifunctional epoxy resin system with a Tg value of approximately 180 °C, suitable for various PCB designs.
  • VT47: An effective high-frequency material for RF and microwave circuits, typically featuring a Tg temperature above 250 °C. It boasts low water absorption and dimensional stability to maintain signal integrity.

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