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Circuit board, circuit board, PCB board, what is the main classification?

Shenzhen Inno Circuit Co.,Ltd | Updated: May 24, 2018

Circuit board, circuit board, PCB board, what is the main classification?

Circuit board, circuit board, PCB board, what is the main classification?

First, single-sided circuit board, circuit board, PCB (Single-Sided Boards)

We mentioned that on the most basic PCB, the parts are concentrated on one side and the wires are concentrated on the other side. Because the wire only appears on one side, we call this kind of PCB a single-sided PCB. Because single-sided PCBs have many strict restrictions on the design circuit (because there is only one side, the wiring cannot be crossed and must be routed alone), only the earlier circuits use this kind of board.


Second, double-sided circuit board, circuit board, PCB board (Double-Sided Boards)

There are wirings on both sides of this board. However, to use two wires, it is necessary to have proper circuit connections between the two sides. This "bridge" between circuits is called a via.

The via hole is on the PCB, filled with or coated with a metal hole, and it can be connected to the wires on both sides. Because double-sided PCB boards are twice as large as single-sided PCB boards, and because wiring can be interleaved (wrap around the other side), it is more suitable for use on more complex circuits than single-sided PCB boards.


Third, multi-layer circuit boards, circuit boards, PCB boards (Multi-Layer Boards)

In order to increase the area that can be routed, multi-layer PCB boards use more single or double-sided wiring boards. The multi-layer PCB board uses several double-sided PCB boards and is laminated (laminated) after placing an insulation layer between each PCB board. The number of layers on the board represents several layers of independent wiring layers. Usually, the number of layers is even, and includes the outermost two layers. Most motherboards have a 4- to 8-layer structure, but it is technically possible to implement nearly 100-layer PCB boards. Large-scale supercomputers mostly use quite multiple layers of motherboards, but since these types of computers can already be replaced by clusters of many ordinary computers, super multi-layer PCB boards have gradually become unused. Because the layers in the PCB are tightly integrated, it is generally not easy to see the actual number, but if you look closely at the motherboard, you may be able to see it.


The vias that we just mentioned, if applied on double-sided PCBs, must all penetrate the entire board. However, in a multi-layer PCB, if you only want to connect some of the lines, the vias may waste some of the other layer's line space. Buried vias and blind vias techniques can avoid this problem because they penetrate only a few layers. Blind vias connect several layers of internal PCB to surface PCB without penetrating the entire board. Buried holes only connect the internal PCB, so the light is not visible from the surface.

In a multi-layer PCB PCB, the entire layer is directly connected to the ground and the power supply. So we classify each layer as Signal, Power, or Ground. If the parts on the PCB require different power supplies, usually the PCB will have more than two layers of power and wires.

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