OKI Unveils Copper-Embedded Rigid-Flex PCBs for Space-Grade Thermal Management

OKI Circuit Technology, a subsidiary of Japan’s OKI Group, has announced the launch of a new line of rigid-flex printed circuit boards (PCBs) embedded with copper coins to enhance heat dissipation in vacuum environments. The technology is aimed squarely at aerospace applications, particularly rockets and satellite-mounted systems, where thermal management remains a critical design challenge.

Addressing Heat in the Void

Traditional PCB designs struggle with heat dissipation in space, where convection is nonexistent. OKI’s solution involves embedding cylindrical copper coins—known for their high thermal conductivity—into through-holes within the rigid sections of the PCB. These coins are bonded directly to heat-generating components, channeling thermal energy to the underside of the board. By integrating this approach into rigid-flex architectures, OKI offers a compact, connector-less solution that reduces weight, saves space, and simplifies assembly.

This innovation aligns with broader industry trends toward miniaturization and modularity in satellite design. As small satellite constellations proliferate, manufacturers are seeking ways to pack more capability into tighter volumes without compromising reliability or thermal performance.

Certified for Space, Built for Flexibility

OKI Circuit Technology has earned certification across all seven schedules of the Japan Aerospace Exploration Agency (JAXA) PCB standards, positioning the company as a credible supplier for space-grade electronics. The firm also supports small-lot production, enabling tailored solutions for varying shapes, sizes, and mounting configurations—an important consideration for prototyping and low-volume satellite missions.

While the company’s initial sales target is modest—20 million yen by FY2026—the strategic emphasis on aerospace markets suggests a longer-term commitment. OKI’s Medium-Term Business Plan 2025 identifies aerospace as a growth area for its Electronics Manufacturing Services (EMS) division, with ambitions to expand both design and simulation capabilities for space-bound hardware.

Industry Context and Forward Momentum

The use of copper coins in PCBs is not new, but their integration into rigid-flex designs for space applications is a noteworthy evolution. As thermal loads increase with more powerful onboard processors and sensors, passive cooling techniques like this will play a vital role in maintaining system integrity.

OKI’s announcement comes ahead of its participation in the Small Satellite Conference in Salt Lake City, Utah, where it will exhibit the new PCBs at the Japan Booth. The timing is strategic, as the conference draws key players from the global smallsat ecosystem, including commercial launch providers, payload developers, and academic researchers.

Our Perspective

While OKI’s release leans heavily on technical merit, the broader implication is clear: the race to optimize thermal performance in space electronics is heating up. With the rise of edge computing in orbit and the push toward autonomous satellite operations, thermal design is no longer a back-end consideration—it’s central to mission success.

For aerospace engineers and systems architects, OKI’s copper-embedded rigid-flex PCBs offer a compelling option for managing heat without sacrificing form factor. Whether this technology gains traction beyond Japan will depend on its adaptability to international standards and its performance in real-world missions.