Thick Copper Blind-Buried Via PCB

1. Superior High-Current Handling and Thermal Management Properties

High Current-Carrying Capacity: The extremely thick copper foil (3oz and above) provides very low DC resistance, enabling it to carry tens to hundreds of amperes of large current without overheating.

Efficient Heat Dissipation: The thick copper layers themselves act as massive heat sinks, effectively absorbing heat generated by power devices (e.g., MOSFETs, inductors) and spreading it evenly across the board area, thereby reducing hot spot temperatures and improving system reliability.

Power Integration: Enables the integration of high-power circuits (e.g., power input, motor drives) and fine-signal circuits on the same board, reducing reliance on external wiring harnesses and connectors, and simplifying system architecture.

2. High-Density Routing and Space-Saving Properties

3D Interconnection: Blind and buried vias allow for three-dimensional routing in the Z-axis, freeing up routing space on the surface and internal layers. Designers no longer need to route long paths to avoid through-holes.

Size Miniaturization: By using blind/buried vias to achieve any-layer interconnects, more complex circuit functions can be realized on a smaller board area, greatly increasing assembly density and meeting the needs of product miniaturization.

Improved Signal Integrity: Reduced use of through-vias means fewer signal reflections and inductive effects caused by via stubs, which is beneficial for high-speed signal transmission. It also allows for shorter, more direct routing paths for critical signals.

3. Enhanced Mechanical Reliability and Structural Integrity

Robust Plated Holes: Plating vias on thick copper boards is challenging, but when successful, the copper wall thickness of the holes is typically greater, resulting in higher mechanical strength and better resistance to current surge and thermal cycling.

Better CTE Matching: The combination of thick copper and core materials, along with the multi-step lamination manufacturing process, can improve the overall CTE (Coefficient of Thermal Expansion) of the PCB to better match that of large BGA components, enhancing solder joint reliability.

4. Complex Manufacturing and High-Cost Characteristics

High Manufacturing Difficulty: Its production involves high-difficulty processes such as multiple laminations, precision drilling, and plating fill. For example, laser drilling microvias on thick copper is extremely challenging; ensuring registration accuracy after each lamination step is critical.

High Cost: Due to complex process flows, long production cycles, and high material consumption (especially copper and prepreg), its cost is significantly higher than that of standard PCBs.

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