PCBAIR Enhances Heavy-Copper PCB Processes to Support High-Power AI Hardware

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As computational demands for artificial intelligence models continue to rise, thermal management has emerged as a key physical constraint for high-performance hardware. Addressing this challenge, PCBAIR, a PCB manufacturing and assembly provider, today announced significant upgrades to its heavy-copper PCB manufacturing processes aimed at supporting the power density and heat dissipation requirements of next-generation AI servers and high-performance computing (HPC) clusters.

With the thermal design power (TDP) of modern AI accelerators and GPUs frequently exceeding 700 watts per chip, conventional PCB stack-ups are increasingly strained. Standard copper weights often fail to support high-current power delivery networks, resulting in elevated I²R losses and excessive thermal buildup.

PCBAIR’s upgraded production line now supports precision heavy-copper fabrication of up to 10 oz (approximately 350 µm) on both inner and outer layers. This enhancement enables the PCB itself to function as an effective heat-spreading element, reducing dependence on external cooling solutions.

Advanced Fabrication to Address Etching Challenges

The upgraded processes target common heavy-copper manufacturing issues, including trace undercutting during etching and resin starvation during lamination.

“The PCB has evolved from a passive carrier into an active part of the thermal solution,” said Victor Zhang, Chief Technology Officer at PCBAIR. “The challenge with heavy copper is not just plating thickness but achieving straight sidewalls to maintain electrical performance. Our upgraded process applies differential etching compensation and vacuum-assisted resin filling to deliver high-current capacity while minimizing risks such as micro-voids and delamination.”

Key Technical Enhancements Include:

• Embedded Copper Coin Technology: Integration of solid copper coins within the PCB to create vertical thermal paths from heat-generating components, such as voltage regulators, to the chassis, addressing the low thermal conductivity of FR-4 substrates.
• Optimized Etching Factor: Proprietary chemical etching processes designed to maintain trace-width consistency on copper layers exceeding 6 oz, supporting stable impedance in power modules.
• High-Reliability Material Qualification: Compatibility with high-Tg laminate materials capable of withstanding the thermal cycling conditions typical of data center environments.

Validated Reliability

To support Tier-1 infrastructure requirements, PCBAIR has expanded its reliability testing program. According to internal test results, heavy-copper PCB prototypes completed 1,000 thermal shock cycles ranging from -40 to +125°C without continuity failures, validating plated through-hole and interconnect robustness.

The manufacturing upgrade represents a strategic expansion for PCBAIR, extending its capabilities beyond consumer electronics to address infrastructure demands in the AI and automotive sectors. The company is now accepting requests for quotation for prototyping and low-to-mid volume production of heavy-copper PCB designs.

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