Although most advanced features such as impedance control and HDI are suitable for 4 layers, their correct implementation and use are mostly found on PCBs with 6 layers and above. But why would you choose a 6-layer PCB instead of a 4-layer or 8-layer PCB? There may be some reasons:
When designing a 4-layer circuit board, due to insufficient wiring space, you added two layers for wiring.
The EMC performance of a 6-layer PCB is much better than that of a 4-layer PCB.
There are too many high-speed signals and their potential crosstalk on the circuit board.
Too many types of power grids are used.
The cost cannot exceed 6 floors.
For this project, 8-layer boards are too complicated.
For whatever reason, the 6-layer PCB achieves a very good balance between cost and allowable complexity. The 6-layer PCB stack can be arranged and combined, making it a versatile choice for various applications.
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