Shenzhen Bicheng
Electronics Technology Co., Ltd

# Call Us Now ! Tel : +86 755 27374946

# Order Online Now ! Email :

20 mil RO4003C PCB
20 mil RO4003C PCB

TMM4 PCB 25mil- What Is the Dielectric Constant of TMM4?

  • March 20. 2024
Introducing the Rogers TMM4 PCB 25mil, a cutting-edge thermoset microwave material that combines the benefits of ceramics and traditional PTFE laminates. Engineered for high plated-thru-hole reliability strip-line and micro-strip applications, TMM4 offers exceptional mechanical and chemical properties, ensuring reliable performance in demanding environments. With its unique composition, this PCB material provides unparalleled reliability, signal integrity, and manufacturing compatibility.

What is the dielectric constant of TMM4?

Firstly, we have the Dielectric Constant of TMM4. At a process value of 4.5±0.045 at 10 GHz, it guarantees reliable signal transmission. During the design phase, the Dielectric Constant is set at 4.7, effectively covering a wide frequency range from 8 GHz to 40 GHz.

Other Unrivaled Performance Properties:

The Rogers TMM4 PCB 25mil boasts impressive performance properties that make it an ideal choice for a wide range of applications. Here are its key features:

1.Dissipation Factor:

The low dissipation factor of .0020 at 10GHz guarantees efficient signal transfer with minimal energy loss. This property ensures superior signal integrity, making TMM4 suitable for high-speed and high-frequency applications.

2.Thermal Coefficient of Dk:

TMM4 exhibits a thermal coefficient of Dk of 15ppm/°K, ensuring stable electrical performance across a wide temperature range. This characteristic makes it suitable for applications subject to varying thermal conditions.

3.Coefficient of Thermal Expansion (CTE):

TMM4 features a CTE matched to copper, with values of x = 16 ppm/°K, y = 16 ppm/°K, and z = 21 ppm/°K. This thermal compatibility minimizes the risk of mechanical stress or delamination, ensuring the long-term reliability of the PCB.

4.Decomposition Temperature (Td):

TMM4 has an impressive decomposition temperature of 425°C TGA, indicating its exceptional thermal stability and resistance to high-temperature environments. This property ensures reliable performance even under extreme operating conditions.

5.Thermal Conductivity:

With a thermal conductivity of 0.7 W/mk, TMM4 facilitates efficient heat dissipation from critical components, preventing overheating and maintaining optimal operating temperatures. This characteristic is particularly beneficial for power amplifiers and other heat-sensitive applications.

6.Moisture Absorption:

TMM4 exhibits low moisture absorption ranging from 0.07% to 0.18%. This moisture resistance minimizes the risk of electrical performance degradation and ensures consistent functionality in humid environments.

TMM4 Substrate

The picture is TMM4 substrate, just for reference.

Robust Construction and Manufacturing Compatibility:

The Rogers TMM4 PCB is specifically designed to meet the rigorous demands of modern PCB manufacturing processes. Its robust construction and compatibility with standard processes offer several advantages:

1)Two-Layer Rigid PCB: The TMM4 PCB 25mil features a two-layer rigid construction, providing a sturdy foundation for various circuit designs.

2)Copper Thickness: The copper layers have a thickness of 35 μm, guaranteeing excellent conductivity and signal integrity.

3)Precise Board Dimensions: The PCB has a circular shape with a diameter of 83mm (+/- 0.15mm), ensuring consistent form factor and compatibility with standard PCB enclosures.

4)Minimum Trace/Space and Hole Size: The TMM4 PCB supports a minimum trace/space of 6/8 mils, enabling intricate circuit designs. The minimum hole size is 0.35mm, facilitating reliable component mounting and efficient routing.

5)Comprehensive Testing and Quality Assurance: Before shipment, each TMM4 PCB undergoes a 100% electrical test, ensuring adherence to IPC-Class-2 standards and guaranteeing its reliability and functionality.

Wide Range of Applications:

The TMM4 25mil substrate PCB finds extensive application in various industries that demand high-performance microwave circuitry. Here are some typical applications:

1.RF and Microwave Circuitry:

TMM4 is well-suited for applications requiring precise signal transmission, such as RF amplifiers, mixers, filters, and oscillators.

2.Power Amplifiers and Combiners:

With its excellent thermal conductivity and reliability, TMM4 is ideal for power amplifier designs that require efficient heat dissipation.

3.Filters and Couplers:

TMM4 ensures low signal loss and high-quality filtering, making it suitable for applications involving filters, couplers, and impedance matching networks.

4.Satellite Communication Systems:

TMM4's high-frequency performance and reliability make it an excellent choice for satellite communication systems, ensuring uninterrupted signal transmission.

5.Global Positioning Systems (GPS) Antennas:

TMM4 enables the design of high-precision GPS antennas, ensuring accurate positioning and navigation.

6.Patch Antennas:

The material's exceptional dielectric properties make it suitable for patch antenna designs, providing reliable wireless communication in applications like IoT devices and wireless sensors.

7.Dielectric Polarizers and Lenses:

TMM4's unique characteristics make it suitable for applications involving dielectric polarizers and lenses, enabling precise control ofelectromagnetic waves and enhancing optical performance.

8.Chip Testers:

TMM4 is an excellent choice for chip testers that require reliable signal transmission, minimizing testing errors and ensuring accurate results.

Availability and Industry Standards:

The TMM4 High frequency PCB is available worldwide, catering to the needs of various industries and applications. Whether you're in North America, Europe, Asia, or any other region, you can access this high-performance material for your PCB requirements.

The product adheres to IPC-Class-2 standards, ensuring consistent quality and reliability. It meets the industry's stringent requirements for performance, manufacturing compatibility, and durability.


The 25mil Rogers TMM4 PCB sets new benchmarks for high-performance microwave materials. Its unique composition combines the benefits of ceramics and traditional PTFE laminates, offering outstanding mechanical strength, reliable signal transmission, and excellent thermal properties. With its wide availability and compatibility with standard manufacturing processes, TMM4 is an ideal choice for applications ranging from RF and microwave circuitry to power amplifiers, satellite communication systems, and more. Trust in the Rogers TMM4 PCB to deliver exceptional performance and reliability for your high-frequency and high-speed circuit design.

© Copyright: 2024 Shenzhen Bicheng Electronics Technology Co., Ltd.. All Rights Reserved.

IPv6 network supported

IPv6 network supported


Leave A Message

Leave A Message

    If you have questions or suggestions,please leave us a message,we will reply you as soon as we can!

  • #
  • #
  • #