The Isola 370HR material offers a range of dielectric constants (DK) and dissipation factors (DF) across various frequencies, which are crucial for designing PCB stackups, especially in high-frequency applications. The DK and DF values change with frequency, and this must be considered when designing circuits that operate over a wide range of frequencies. For instance, at 100 MHz, the DK values range from approximately 3.81 to 4.02, and the DF values range from 0.014 to 0.020, depending on the specific construction and resin content percentage .

When building a PCB stackup using Isola 370HR, it's essential to select the appropriate prepreg and core materials based on the desired electrical properties and mechanical stability. The choice of weave type and resin content also affects the DK and DF values, as shown in the detailed tables. For high-frequency applications, choosing materials with lower DF values can help in reducing signal loss, which is critical for maintaining signal integrity. The tables provide a comprehensive overview of how these properties vary with different configurations and frequencies, allowing engineers to make informed decisions based on specific design requirements .

Here are some key considerations for using Isola 370HR in PCB stackup design:

• Review the DK and DF values at the operating frequency of your application to ensure compatibility and performance.
• Consider the thickness and resin content as they significantly impact the dielectric properties and the overall robustness of the PCB.
• For high-speed applications, prioritize materials with lower DF to minimize signal degradation over distance.
• Always verify the compatibility of the chosen material with other components of the stackup, such as solder masks and surface finishes, to ensure reliability and manufacturability.

By carefully selecting the right configurations from the Isola 370HR series, engineers can optimize their PCB designs for both performance and reliability, tailored to the specific needs of their electronic applications .