Panasonic’s R-1566S laminates stand out as a premium choice for high-performance applications. Renowned for their exceptional electrical and mechanical properties, these laminates are engineered to meet the demands of industries requiring reliability, durability, and precision.
In this article, we’ll discuss what really characterizes the high Tg R-1566S 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 CTI print circuit board, so please feel free to contact us.

What is the Panasonic R-1566S Laminate?
The Panasonic R-1566S PCB material demonstrates a Tg value of 170°C as measured by the TMA method, and a glass transition temperature (Tg) of 195°C determined via the DMA method. The glass transition temperature signifies the threshold at which the material transitions from a ductile to a brittle and rigid state, typically occurring at a lower temperature than the melting point of the material’s crystalline phase.
The Panasonic PCB material is acknowledged as a high-heat-resistant, halogen-free multilayer material, rendering it highly appropriate for automotive ECU and HEV/EV power control unit applications. A notable characteristic of R-1566S is its Comparative Tracking Index (CTI) value of 600V, which reflects superior resistance to electrical tracking. This feature makes it particularly well-suited for high-voltage and high-reliability applications where insulation performance is critical. By capitalizing on its multi-layer processability, high thermal conductivity, and halogen-free properties, this material is ideally suited for miniaturized DC/DC converter PCB boards. Furthermore, it facilitates the miniaturization of printed circuit boards while providing exceptional anti-aging characteristics, thereby enhancing its reliability and performance in demanding environments.
Panasonic R-1566S Laminate Data Sheet


Features of Panasonic R-1566S Laminate
Panasonic R-1566S laminates are engineered to meet the performance requirements of advanced electronic systems. Below are some of the most important material properties:
Glass Transition Temperature (Tg)
The Tg of R-1566S is approximately 170°C, which ensures the laminate maintains its structural integrity under higher thermal conditions. This makes it suitable for applications that require stable performance at elevated temperatures.
Decomposition Temperature
The laminate possess a high decomposition temperature, which indicates excellent resistance to thermal degradation. The Panasonic R-1566S PCB material has a decomposition temperature of 355 degrees Celsius. This is especially important in applications that involve exposure to high temperatures, ensuring the longevity and stability of the material throughout its lifecycle.
Dielectric Constant (Dk)
R-1566S features a dielectric constant of around 4.7 at 1 GHz, ensuring reliable signal integrity and minimal signal loss in high quality circuits. This is particularly important in automotive and power control systems where precision is critical.
Dissipation Factor (Df)
The dissipation factor of R-1566S is low, generally around 0.011 at 1 GHz, indicating that it exhibits minimal energy loss during signal transmission. This property is essential for high frequency applications where signal attenuation can impact system performance.
High CTI Value (600V)
One standout feature of R-1566S is its Comparative Tracking Index (CTI) value of 600V, indicating exceptional resistance to electrical tracking. This makes it especially suited for high-voltage and high-reliability applications where insulation performance is critical.
Coefficient of Thermal Expansion
At the X and Y axis at α1, the Panasonic laminate has a CTE value of 11 – 13 ppm/℃. Furthermore, at the Z-axis and α1, it has a CTE value of 40 ppm/℃, while at α2, it’s CTE is 180 degrees Celsius. The coefficient of thermal expansion indicates how much a material can expand when it is heated.
Low Water Absorption
Low moisture uptake preserves electrical characteristics over the product lifecycle and enhances reliability in humid environments. The water absorption value of the Panasonic PCB material is 0.18%. This means that this material doesn’t absorb water easily.
Applications of Panasonic R-1566S Laminate
The R-1566S is designed for high-reliability applications where performance under extreme conditions is non-negotiable:
Automotive ECU (Electronic Control Units)
Automotive ECUs require high-performance materials to ensure reliable operation in harsh conditions. The laminate offer the necessary thermal stability, dielectric performance, and mechanical strength to meet the demanding requirements of automotive electronics.
Automotive Modules
Whether it’s for lighting, sensor systems, or advanced driver-assistance systems (ADAS), R-1566S is a preferred choice due to its superior electrical properties and durability. Beyond ECUs, this laminate supports various automotive modules, including body control, infotainment, and ADAS systems, helping manufacturers meet the growing demand for performance and reliability in modern vehicles.
HEV/EV Power Control Units
Hybrid Electric Vehicle (HEV) and Electric Vehicle (EV) power control units rely on high-performance laminates for managing power distribution and thermal management. R-1566S ensures that these systems operate efficiently, even under the extreme conditions typical of EV/HEV environments.
DC/DC Converter Boards
Efficient thermal management and low CTE prevent failures in power conversion systems, even under rapid load changes. Power conversion systems, such as DC/DC converters, require laminates that can support high frequencies and manage heat dissipation. R-1566S offers the ideal combination of electrical insulation, low Dk/Df, and thermal performance to handle these critical functions in power electronics.
Processing Advantages of Panasonic R-1566S Laminates
UL 94 V-0 Flammability
R-1566S laminates meet the stringent UL 94 V-0 flammability standards, meaning they are highly resistant to fire. This feature is particularly important in safety-critical applications where the risk of fire must be minimized, such as automotive and aerospace industries.
High Heat-Resistance
Another major advantage of R-1566S laminates is their excellent heat resistance. The material can withstand high operating temperatures, making it ideal for environments where heat buildup is a concern. This capability is essential in applications like automotive electronics and communication systems, where components are subject to intense heat during operation.
Environmentally Safe
Panasonic’s commitment to sustainability is evident in R-1566S laminates, which are environmentally friendly and free from harmful substances. Compliant with RoHS and halogen-free requirements, the laminates align with global regulations for eco-friendly electronics.
Great Performance
The overall performance of R-1566S laminates is exceptional across various parameters. The material’s ability to perform in high-frequency, high-temperature, and high-stress environments makes it an ideal choice for a wide range of industries, including telecommunications, automotive, and aerospace.
Panasonic R-1566S laminates are at the forefront of advanced PCB materials, combining high thermal stability, excellent electrical performance, and superior mechanical strength. With a high CTI rating of 600V, it stands out in the market for insulation-critical applications. For more information or inquiries about Panasonic R-1566S laminates, feel free to reach out! We hope this overview has provided valuable insights into the capabilities and potential applications of these innovative materials.
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