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In this article, we’ll discuss what really characterizes the low Dk ThunderClad 4R (TU-943R) laminate. The relevant information is available for pcb design engineers to refer to in the selection of materials, And you can also call QFPCB to discuss. QFPCB offers the best services when it comes to the high layer count print circuit board, so please feel free to contact us.
What is the low Dk ThunderClad 4R (TU-943R) laminate?
ThunderClad 4R (TU-943R) laminate features a dielectric constant (Dk) of 3.22 at 10GHz, ensuring consistent signal performance across a wide range of frequencies. It is an advanced material specifically engineered with low Dk glass fabric for high speed computing, telecommunications, and radio frequency applications that require ultra-low loss performance. ThunderClad 4R (TU-943R) laminate offers electrical performance comparable to PTFE based and hydrocarbon-based materials with very low loss characteristics, while also supporting high layer count circuit board designs with superior thermal reliability.
Additionally, ThunderClad 4R (TU-943R) laminates demonstrate excellent moisture resistance, improved coefficient of thermal expansion (CTE), superior chemical resistance, thermal stability, conductive anodic filament (CAF) resistance, and compatibility with modified FR-4 processes.
Features of the low Dk ThunderClad 4R (TU-943R) datasheet

Excellent Electrical and Thermal Properties
Designed for high-performance applications, ThunderClad 4R (TU-943R) laminate offers outstanding electrical and thermal stability. Supports effective heat dissipation, ensuring reliable operation under high thermal loads.
Dielectric Constant (Dk) of 3.22 @ 10GHz
The laminate features a dielectric constant (Dk) of 3.22 at 10GHz, ensuring consistent signal performance across a wide range of frequencies. Supports higher operating frequencies while maintaining excellent signal integrity, ensuring reliable data transmission.
Dissipation Factor (Df) of 0.0015 @ 10GHz
With a dissipation factor (Df) of 0.0015 at 10GHz, the material minimizes signal loss, making it ideal for high frequency designs. Reduces heat generation, contributing to better thermal management and longer component lifespan.
Stable and Flat Dk/Df Performance Over Frequency and Temperature Variance
The material provides reliable Dk and Df values across varying frequencies and temperatures, ensuring dependable performance in diverse conditions. Facilitates precise circuit design and simulation, reducing uncertainties in the development process.
Anti-CAF Capability
ThunderClad 4R (TU-943R) laminate exhibits excellent resistance to conductive anodic filament (CAF) formation, enhancing its reliability in high density designs. Enhanced resistance to conductive anodic filament formation, preventing potential short circuits and ensuring long-term reliability.
Improved Z-Axis Thermal Expansion
The Automotive Electronics PCB material’s optimized z-axis thermal expansion contributes to improved durability and compatibility with advanced packaging technologies. Ensures consistent performance through multiple thermal cycles, crucial for long-term reliability in demanding environments.
Excellent Moisture Resistance and Lead-Free Reflow Process Compatibility
ThunderClad 4R (TU-943R) laminate is compatible with lead-free soldering processes, supporting environmentally friendly manufacturing practices. Its resistance to moisture ensures stable performance in humid environments. Compatible with lead-free soldering processes, aligning with environmental standards and supporting sustainable manufacturing practices.

Applications of the low Dk ThunderClad 4R (TU-943R) laminate
ThunderClad 4R (TU-943R) laminate is specifically designed to address the needs of advanced electronic systems. Key application areas include:
Radio Frequency (RF)
Ideal for RF modules requiring high efficiency and minimal signal loss, ensuring reliable communication over large areas. With its superior dielectric and low-loss characteristics, ThunderClad 4R (TU-943R) laminate is ideal for RF systems requiring high signal integrity.
Backplane and High Performance Computing
The material’s stability and electrical properties make it suitable for high speed backplane and computing applications. Essential for backplanes and high performance computing systems where high speed data transmission and signal integrity are critical, providing robust performance in network infrastructure and data centers.
Line Cards and Storage
ThunderClad 4R (TU-943R) laminate supports reliable performance in data-intensive storage systems and line cards. Critical for line cards and storage devices requiring high speed data processing and transmission capabilities, ensuring reliable operation in data-intensive environments.
Servers,Telecom and Base Station
Its low dissipation factor and thermal stability enable efficient performance in server and telecom environments, including base station designs. Suitable for servers, telecommunications equipment, and base stations that demand high speed data processing and reliable thermal management.
Super Core Routers and Switches
Designed for high-performance networking, the laminate ensures consistent performance in core routers and switchers. Perfect for super core routers and switchers needing exceptional performance and durability in handling massive data traffic efficiently and reliably.
Advantages of the low Dk ThunderClad 4R (TU-943R) laminate
Manufacturers benefit significantly from the processing advantages offered by ThunderClad 4R (TU-943R) laminate, which include:
Maximum Operating Temperature: 140°C
The material performs reliably at a maximum operating temperature of 140°C, ensuring stability under thermal stress. Supports effective thermal management in components exposed to elevated temperatures.
Superior Dimensional Stability, Thickness Uniformity, and Flatness
Its dimensional stability and uniform thickness ensure precise and efficient fabrication processes. Provides superior dimensional stability, enhancing the overall quality and reliability of the final product.
Compatibility with Modified FR-4 Processes
ThunderClad 4R (TU-943R) laminate can be seamlessly processed using modified FR-4 techniques, allowing for ease of integration into existing manufacturing workflows. Fully compatible with modified FR-4 processes, allowing manufacturers to leverage existing equipment and expertise. Reduces the need for specialized equipment, lowering production costs while maintaining high performance.
Ultimately,ThunderClad 4R (TU-943R) laminate is a high-performance material that combines exceptional electrical, thermal, and environmental properties, making it an ideal choice for a broad spectrum of applications, including RF, telecom, and high-performance computing. By choosing ThunderClad 4R(TU-943R) laminate, manufacturers can achieve superior performance, enhanced safety, and extended product lifetimes while benefiting from excellent price-performance value.
If you have any further questions, please feel free to leave a comment below or contact QFPCB by email ([email protected]).











