There are also quite a few drawbacks to 6-layer PCBs, including:
Fee standard: 6-layer PCB is very expensive. They are expensive not only because they have more layers and therefore require more materials, but also because 6-layer PCBs are mainly used for high-speed or high EMC applications, which typically have higher manufacturing costs.
Complex design and manufacturing: 6-layer PCBs require specialized knowledge in design and manufacturing. The complexity of 6-layer PCB leads to longer manufacturing delivery cycles. Debugging 6-layer PCBs has also become difficult.
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