The Sections of a 4-layer PCB

What is a printed circuit board?

Printed circuit board, also known as PCB, is the provider of electrical connections for electronic components. It has been developed for more than 100 years; its design is mainly layout design; the main advantage of using the circuit board is that it greatly reduces wiring and assembly errors, and improves the automation level and production labor rate.

According to the layer count of circuit boards, it can be divided into single-panel, double-panel, four-layer, six-layer and other multi-layer PCB boards.

Since the printed circuit board is not a general terminal product, the definition of the name is slightly confusing. For example, the motherboard for the personal computer is called the motherboard, and cannot be directly called the circuit board. Although there is a circuit board in the motherboard, It’s not the same, so when you evaluate the industry, you can’t say the same thing. For example, because the integrated circuit parts are mounted on the circuit board, the news media called him an IC board, but in essence he is not equivalent to a printed circuit board. We usually say that the printed circuit board refers to the bare board – that is, the board without the upper components.

4 layer printed circuit section

The multi-layer printed board is a printed board which is laminated and bonded by alternating conductive pattern layers and insulating material layers. The number of layers of the conductive pattern is more than two layers, and the electrical interconnection between the layers is realized by metallized holes. The connection line of the multilayer printed board is short and straight, which is convenient for shielding, but the process of the printed board is complicated, and the reliability is slightly poor due to the use of the metallized hole. It is often used in computer boards.

For the production of the board, the more the number of layers of the board, the more the production process, the failure rate is of course increased, and the cost is relatively increased, so the multi-layer board is only used in the advanced circuit.

The illustration shows a four-layer board profile. Usually on the circuit board, the components are placed on the top layer, so the general top layer is also called the component surface, and the bottom layer is generally used for soldering, so it is also called the soldering surface. For SMD components, components can be placed on both the top and bottom layers. Components are also divided into two broad categories, pin-type components and surface-mount components (SMD).

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