Why Use FR-4 for Fabricating High-Tg PCBs?

Several applications require PCBs that withstand relatively high temperatures ranging from 200 °C, or more. To perform reliably in high-temperature applications, we need specialized PCBs that are fabricated using performance-driven materials. This blog aims to familiarize you with one such specialized PCBs namely, High-Tg. These PCBs can handle extreme PCB glass transition-temperature, whilst offering the following;

  • Improved impedance control
  • Better thermal management
  • Low moisture absorption
  • Consistent performance

FR4 Fabricating high TG PCBs

FR-4 – The Material of Choice for High-Tg PCBs

For applications in extreme temperature range, high-Tg PCBs are manufactured using FR-4 substrate. FR-4 is a flame-retardant fiberglass reinforced epoxy material that resists multiple lamination cycles, complicated PCB processing, and allows lead-free soldering. The commonly used FR-4 substrates include pure PTFE, ceramic filled PTFE and thermoset hydrocarbon substrates.

Following are the peculiar properties of FR-4 substrate, which make them an ideal choice for PCBs intended for demanding applications.

  • Outstanding electrical performance.
  • Ability to withstand special drilling and plated through hole (pth) preparations.
  • Good plated through hole reliability.
  • Relatively low cost.
  • Stable dissipation factor (Df) compared to other standard PCB materials.
  • Exceptional chemical resistance
  • Suitable for PCB designs requiring much tighter impedance control.
  • Vibration, shock and flame resistant.

Considering its peculiar properties in terms of thermal management, FR-4 High-Tg PCBs are largely chosen for applications in Computing, Storage & Peripherals, Consumer Electronics, Networking & Communication Systems, Aerospace & Defense, Medical, Industrial & Instrumentation, and Automotive & Transportation industries.

Choose the Right Material to Achieve the Desired Results

Amongst the types of FR-4 materials available, it is important to choose the right one as per the application requirements as it determines the stability, and optimum performance of the final assembly. Factors such a dielectric constant, loss factor, thermal conductivity, transition temperature, coefficient of thermal expansion (CTE), electrical performance should be considered before choosing FR-4 substrate for your applications. If you are confused making a decision about the type of FR-4 material to choose, consider partnering with a PCB fabricator who is experienced in supplying High-Tg PCBs to various industries. RigiFlex technologies is one of the prominent PCB manufacturers in the market who possesses hands-on experience in delivering High-Tg PCBs of various configurations. Due their years’ of business experience and innovative technologies, RigiFlex is capable of handling different laminate materials and substrate materials that best suit the customers’ application requirements.

PCB Online Quote