Disadvantages of Odd Number Layer Count Circuit Boards

Why Choosing Odd Number Layers Might Seem Cost-Effective

Some PCB layout engineers may consider using an odd number layer count in their designs, thinking it could save costs by reducing one layer compared to an even number layer PCB. However, this assumption often proves to be a misconception.

Manufacturing Challenges with Odd Number Layers

When manufacturing odd number layer count PCBs, the PCB factory still needs to adjust the design to an even number layer count internally. This adjustment is necessary due to several manufacturing challenges:

1. Imbalanced Pressure Distribution:

The compression process during PCB manufacturing requires even pressure distribution across all layers. With an odd number layer design, pressure cannot be evenly distributed, leading to issues.

2. Air Bubbles:

Unequal pressure can cause air bubbles to form between the copper sheets and prepreg layers. These bubbles compromise the integrity and quality of the final PCB, resulting in potential fatal defects.

Additional Quality Concerns

Beyond the manufacturing difficulties, other factors can affect the quality of odd number layer count PCBs. These issues will be discussed in future updates.

For further inquiries, please feel free to email us at: sales@syspcb.com.