The DuPont™ Interra® HK04M All-Polyimide Embedded Capacitor Laminate is a specialized material designed for use in printed wiring boards (PWBs) where high capacitance density and low inductance are critical. This material is particularly suited for applications requiring efficient power and ground planes, offering a thinner and more efficient alternative to traditional setups. The double-sided copper-clad laminate incorporates an adhesive-less, all-polyimide dielectric layer, which not only reinforces thinner constructions but also provides excellent resilience during processing and fabrication .

When designing a PCB stackup using the Interra® HK04M, consider the following guidelines:

• Ensure compatibility with existing PWB processes, as HK04M is designed to integrate seamlessly with double-sided processing techniques.
• Utilize the high capacitance density (up to 240 pF/cm²) and low dielectric constant (Dk of 3.5 at both 1 MHz and 2 GHz) to optimize the board for low noise power delivery and efficient signal integrity .
• Pay attention to the material's peel strength and thermal properties, which ensure durability and reliability during and after soldering. The laminate's peel strength is robust, maintaining good adhesion to copper even after soldering processes .
• Store the laminate in conditions between 4 - 29 °C and below 70% relative humidity to maintain its quality and performance as specified by DuPont™ .

Finally, for engineers looking to reduce the physical size of their devices without compromising on performance, the HK04M's thin design helps decrease overall board or package thickness. This can be particularly beneficial in compact electronic devices where space is at a premium. Additionally, the material is RoHS compliant and certified to IPC-4821/1, ensuring it meets rigorous industry standards for safety and environmental impact .