4-layer Rogers spray tin PCB board

Composition and Structure

4-layer PCB means that the printed circuit board is made of 4 layers of fiberglass. There are four routing layers: top, bottom, VCC, and GND. Generally, through holes, buried holes, and blind holes are used to connect the layers. There are more buried and blind vias than double-sided.

Design Considerations

In addition, try not to run signal traces on the VCC and GND layers.

Advantages Over Double-sided Rogers PCB Boards

Compact Design

4-layer PCB boards have many advantages over double-sided Rogers PCB boards. They can be designed to be more compact.

Improved Noise Immunity

They have significantly improved noise immunity.

Easier Layout

And are easier to lay out.