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20 mil RO4003C PCB
20 mil RO4003C PCB
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Where Are PCB Multi-layer Circuit Boards Used?

  • 2021-12-16
Summary of the classification of pcb circuit boards, detailed introduction of the use and characteristics of single-sided circuit boards, double-sided circuit boards, and multi-layer circuit boards.

PCB circuit board classification

PCB circuit boards are divided into single-sided circuit boards, double-sided circuit boards, and multilayer circuit boards according to the number of superimposed layers.

The first is the single-sided circuit. On the most basic PCB, the parts are concentrated on one side, and the transmission lines are concentrated on the other side. Since the transmission line only appears on one side, this type of PCB is called a single-sided circuit board. Single-sided circuit boards are generally easy to manufacture and low in engineering cost, but the drawback is that they cannot be applied to too complicated products.


Double-sided circuit boards are the expansion of single-sided circuit boards. When single-sided wiring cannot be considered as the necessity of electronic equipment, double-sided circuit boards need to be used. There are copper-clad and wiring on both sides, and the middle route of the double layer can be switched on and off according to the pad to make the necessary data connection.


Multi-layer circuit board refers to a PCB with three layers of conductive pattern layers and insulating layer materials laminated at intervals, and the conductive patterns are interconnected as required. Multi-layer pcb circuit board is the material of the development trend of electronic device information technology to high-speed operation, intelligence, large space, small volume, thinner and lighter weight.


RO4350B Multilayer PCB


PCB circuit boards are divided into flexible boards (FPC),rigid boards (PCB), and rigid-flex boards (FPCB) according to their characteristics.



How to judge double-layer pcb circuit board and single-sided pcb circuit board

1. Take it up to the light, the inner core is opaque, that is, it is all black, it is a multilayer board, on the contrary it is a single-sided circuit board, and a single-sided circuit board has only one layer of routes , There is no copper in the hole. The double-sided circuit board has a route on both sides, and there is copper in the guide hole.

2. The most fundamental difference is that the number of layers is different: a single-sided PCB circuit board has only one layer (copper layer), all holes are made of non-metallic materials, and the two-layer PCB circuit board has double layers in the electroless plating process. Route (copper layer), with metalized holes and non-metal materialized holes, with electroplating process steps

3. PCB circuit boards are divided into single-sided pcb circuit boards, double-sided pcb circuit boards and multilayer pcb circuit boards. Multi-layer pcb circuit boards refer to pcb circuit boards with three layers and the number of superimposed layers above. The processing technology of multi-layer pcb circuit boards is basically the manufacturing process of single- and double-sided circuit boards plus internal pressure lamination. It can also be analyzed by using slices to distract.

Which products must use PCB board

It is necessary to integrate the electronic equipment of the route, this kind of electronic equipment in order to save indoor space, make the product lighter/more durable/and achieve very good characteristics, it must replace the previous power line connection and then change to the pcb circuit board. PCB is very good in fulfilling the requirements of indoor space/characteristics and credibility.

Not every household appliance requires a circuit board. Simple household appliances can do without power circuits such as motors. However, household appliances with special functions generally require circuit boards to be completed, such as televisions, tape recorders, and computers. There is also a PCB board at the bottom of the rice cooker, and a speed-regulating motor in the cooling fan.

What types of products use PCB boards

PCB generally refers to hard circuit boards, used in desktop computer motherboards, computer mouse boards, discrete graphics cards, office supplies, copiers, printers, remote controllers, various charging heads, calculation methods, digital cameras, voice recorders, TV motherboards, Comparison of limited TV amplifiers, mobile phones, automatic washing machines, electronic scales, telephones, LED lamps, household appliances: central air conditioners, household refrigerators, speakers, MP3; mechanical equipment, GPS, cars, instrumentation equipment, medical equipment, airplanes Fields, military equipment, cruise missiles, communications satellites, etc. (There is also an APCB which is also made. It is also a circuit board, which is only soft. For example, the power circuit between the flip phone connection cover and the key is a flexible circuit board).

The main board of the mobile phone and the functional keyboard are plastic bed boards; the connecting line of the sliding cover mobile phone or the flip mobile phone is a flexible circuit board. The controller generally uses a carbon film board. From top to bottom, the upper board of the mobile phone is a radio frequency circuit, a circuit, an audio power supply circuit, and a sequential logic circuit.

Generally, only heating electric kettles do not have a circuit board, and the power line support frame is immediately connected. The vertical water dispenser also has a circuit board. Electric rice cookers generally have pcb circuit boards, induction cookers have pcb circuit boards, and electric fans have pcb circuit boards, but they are generally used for variable speed, timing execution, and display of information. They have no specific effects on the operation of electric fans.

What product uses two-layer board, and what product uses multi-layer board

The key is to see whether the two-layer board can be considered, such as anti-interference, wiring, and EMC level regulations. The two-layer board can be completed, and the multi-layer board is not necessary.

Double-layer PCB circuit board and single-sided PCB circuit board which is better?

In life, multi-layer boards are the most widely used type of pcb circuit boards at this stage, so what are the advantages of multi-layer pcb circuit boards:

Advantages of using multi-layer pcb circuit boards:

1. The relative installation density is high, the size is small, and the quality is light. Consider the requirements of the slight form of electronic products;

2. Because of the relatively high installation density, the connection between the components (including electronic devices) is reduced, and the installation operation has high credibility;

3. Because the pattern is repeatable and consistent, errors in wiring and installation are reduced, and time for maintenance, adjustment and inspection of machinery and equipment is saved;

4. It can increase the number of superimposed layers of routing, thereby increasing the coordination ability of design schemes;

5. It can form a power circuit with a certain characteristic impedance, and can produce a point-to-point transmission power circuit;

6. The power supply circuit and equivalent circuit can be set to shield the layer, and the metal material core heat removal layer can be set to consider the special functions such as shielding and heat removal.

With the continuous development trend of electronic information technology and the continuous improvement of electronic product regulations in the manufacturing industries of electronic computers, diagnosis and treatment, airlines, etc., the direction of the volume of circuit boards has become smaller, the quality has been eased, and the relative density has increased. Because of the limited indoor space available for single and double-sided pcb boards, it is impossible to achieve a further increase in the relative density of installation. Therefore, it is necessary to consider the application of a higher number of layers and assemble a relatively high-density multi-layer pcb circuit board. Multilayer pcb circuit boards have been widely used in the production and processing of electronic equipment due to their flexible design, stable and reliable electrical equipment characteristics and excellent economic development characteristics.

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