You see eight main design layers in the PCB

It is important to understand and distinguish the layers of a PCB. To better understand the exact thickness of the PCB, fine distinctions are needed to ensure that the PCB works at maximum efficiency. The following layers are typically seen in stacked PCBS. These may vary, depending on the number of layers, the designer, and the design itself.

L mechanical layer

This is the basic layer of a PCB. It is used as the outline of the circuit board. This is the basic physical framework of a PCB. This layer also enables the designer to communicate the exact location of the boreholes and cuts.

L keep layer

This layer is similar to the mechanical layer in that it can also be used as a contour. However, the function of the holding layer is to define the periphery for placing electrical components, circuit wiring, etc. No component or circuit can be placed outside this boundary. This layer limits the wiring of CAD tools over specific areas.

L routing layer

The routing layer is used to connect components. These layers can be located on either side of the circuit board. The placement of layers is up to the designer, who makes decisions based on the application and the components used.

L Grounding plane and power plane

These layers are critical to the proper operation of a PCB. Ground grounding and distribution of grounding throughout the circuit board and its components. The power layer, on the other hand, is connected to one of the voltages located on the PCB itself. Both layers can appear on the top, bottom, and break plates of the PCB.

L Split plane

The split plane is basically the split power plane. For example, the power plane on the board can be split in two. One half of the power plane can be connected to + 4V and the other half to -4V. Thus, components on a board can operate with two different voltages depending on their connections.

L Cover/screen layer

The silkscreen layer is used to implement text markers for components placed on top of the board. The overlay performs the same job except for the bottom of the plate. These layers aid in the manufacturing and debugging process.

L resistance welding layer

Copper wiring and through-holes on circuit boards are sometimes referred to as protective coverings of solder resistance layers. This layer keeps dust, dust, moisture and other environmental factors away from the board.

L the solder paste layer

Use solder paste after assembly surface mounting. It helps to weld components to the circuit board. It also facilitates free flow of solder in a PCB consisting of surface-mounted components.

All of these layers may not exist in a single-layer PCB. These layers are based on the printed circuit board design. These design layers help estimate the total thickness of the PCB when each micron thickness is accounted for. These details will help you maintain the strict tolerances found in most PCB designs.