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• Thermal Conductivity: Multi-layer PCBs often have poorer thermal conductivity, leading to localized heat concentration and potentially affecting soldering quality.
• Warpage: The increased number of layers makes PCBs more susceptible to warping during the soldering process, impacting component placement accuracy.
• Process Complexity: Manufacturing multi-layer PCBs is more complex and costly, requiring advanced equipment and skilled personnel.
• Testing Difficulty: The intricate internal circuitry of multi-layer PCBs makes testing more challenging and increases production costs.

• Optimized PCB Design: Strategically placing components and minimizing inter-layer connections can improve thermal conductivity.
• Appropriate Solder Selection: Choosing the right solder material based on PCB material and layer count ensures optimal soldering quality.
• Advanced Soldering Techniques: Employing cutting-edge soldering equipment and processes, such as laser soldering and lead-free soldering, can enhance results.
• Rigorous Quality Control: Implementing strict quality control measures to ensure consistent product quality.

3. The Future of PCB Layers and SMT

4. Conclusion