1.3.4. Number of PCB Layers
In general, the number of PCB layers required to route signals is inversely proportional to the number of traces between vias (i.e., the more traces used, the fewer PCB layers required). You can estimate the number of layers your PCB requires by first determining:
- Trace and space size
- Number of traces routed between the via capture pads
- Type of vias used
Using fewer I/O pins than the maximum can reduce the required number of layers. The via type selected can also reduce the number of layers required. To see how the via type can affect the required number of PCB layers, consider the sample layouts shown in the following sections.
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