PCB what are the classification of printed circuit boards

PCB according to the board application to classify single panel, double panel, multilayer PCB; According to the material, there are flexible PCB board (flexible board), rigid PCB board, rigidity-flexible PCB board (rigid flexible board), etc. Printed Circuit Board (PCB), also known as Printed Circuit Board, is an important electronic component, is the support body of electronic components, is the supplier of electronic components electrical connection, because it is made by electronic printing technology, so it is also called Printed Circuit Board. A PCB is simply a thin plate containing integrated circuits and other electronic components.


I. Classification according to the number of circuit layers

Divided into single panel, double panel and multi-layer board. The common multilayer board is usually 3-6 layers, and the complex multilayer board can reach more than 10 layers.

(1) Single panel

On a basic printed circuit board, the parts are concentrated on one side and the wires are concentrated on the other. Because the wire appears on only one side, the printed circuit board is called a single panel. Early circuits used this type of circuit board because there were many strict restrictions on the design circuit of a single panel (because there was only one side, the wiring could not cross and had to be routed in a separate path).

PCB what are the classification of printed circuit boards

(2) Double panels

The circuit board has wiring on both sides. In order for the wires on both sides to communicate, there must be a proper circuit connection between the two sides, which is called the guide hole. Guide holes are small holes in a printed circuit board, filled or coated with metal, that can be connected to wires on both sides. Double panels can be used on more complex circuits than single panels because the area is twice as large and the wiring can be interlaced (it can be wound to the other side).

PCB what are the classification of printed circuit boards

(3) Multilayer board

In order to increase the area that can be wired, multi-layer boards use more single or double-sided wiring boards. Multilayer boards use a number of double panels, and put an insulating layer between each layer of the board after bonding. The number of layers on a board represents a number of independent wiring layers, usually an even number of layers, and contains the outermost two layers.

PCB what are the classification of printed circuit boards

Two, according to the type of substrate

Flexible circuit boards, rigid circuit boards and rigid-flexible bonded boards.

(1) Flexible PCB board (flexible board)

Flexible boards are printed circuit boards made from flexible substrates, which have the advantage of being bent to facilitate assembly of electrical components. FPC has been widely used in aerospace, military, mobile communications, portable computers, computer peripherals, PDA, digital cameras and other fields or products.

PCB what are the classification of printed circuit boards

(2) Rigid PCB board

It is made of paper base (usually used for single side) or glass cloth base (often used for double-sided and multi-layer), pre-impregnated phenolic or epoxy resin, one or both sides of the surface glued with copper foil and then laminated curing. This kind of PCB copper-clad foil board, we call it rigid board. Then made into PCB, we call it rigid PCB rigid board is not easy to bend, has a certain strength and toughness of the rigid base material made of printed circuit board, its advantage is that it can be attached to the electronic components to provide a certain support.

PCB what are the classification of printed circuit boards

(3) Rigid-flexible PCB board (rigid-flexible PCB board)

Rigid-flexible bonded board refers to a printed circuit board containing one or more rigid and flexible areas, composed of rigid boards and flexible boards laminated together. The advantage of rigid-flexible composite plate is that it can not only provide the support of rigid printing plate, but also has the bending characteristics of flexible plate, which can meet the needs of three-dimensional assembly.