PCB News - The difference between multi-layer circuit boards and single-sided circuit boards

The difference between multi-layer circuit boards and single-sided circuit boards

Circuit board classification:

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

First, it is a single-sided circuit board. On the most basic PCB, the parts are concentrated on one side, and the wires are concentrated on the other side. Because the wires only appear on one side, this kind of PCB is called a single-sided circuit board. Single-sided circuit boards are usually simple to produce and low in cost, but the disadvantage is that they cannot be applied to products that are too complex.

Double-sided circuit board is an extension of single-sided circuit board. When single-layer wiring cannot meet the needs of electronic products, double-sided boards are used. There are copper-clad wires on both sides, and the lines between the two layers can be connected through vias to form the required network connections.

Multilayer circuit board refers to a printed board with three or more conductive pattern layers laminated with insulating materials between them, and the conductive patterns are interconnected as required. Multilayer circuit boards are the product of the development of electronic information technology in the direction of high speed, multi-function, large capacity, small volume, thinner and lighter weight.

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

How to distinguish between multi-layer circuit boards and single-layer circuit boards:

1. Take it up and face the light. The inner core is opaque, that is, it is all black. It is a multi-layer board. On the contrary, it is a single and double board. A single board has only one layer of wiring and no holes. copper. The double-sided board has lines on the front and back, and there is copper in the lead-through hole.

2. The most fundamental difference is the number of lines:

Single-layer circuit board has only one layer of circuit (copper layer), all holes are non-metallized holes, no electroplating process;

Double-layer circuit board has two layers of circuits (copper layer), with metallized holes and non-metallized holes, and electroplating process.

3. Circuit boards are divided into single-sided circuit boards, double-sided circuit boards and multilayer circuit boards. Multi-layer circuit boards refer to circuit boards with three or more layers. The manufacturing process of multi-layer circuit boards will add the manufacturing process of inner lamination on the basis of single and double-sided circuit boards. Distraction using slices can also be analyzed.

What products need PCB circuit board:

Electronic products with integrated circuits are needed. In order to save space, make products lighter/more durable/and achieve good performance, these electronic products must eliminate the previous wire connections and switch to printed circuit boards. The PCB circuit board meets the space/performance and reliability requirements very well.

Not every electrical appliance needs a circuit board, simple electrical appliances may not need circuits such as motors. However, electrical appliances with specific functions generally require circuit boards to achieve many, many, such as televisions, radios, and computers. There is also a PCB board at the bottom of the rice cooker and a speed regulator in the fan.

What kind of products are used in PCB circuit boards:

PCB generally refers to a hard circuit board, used in computer motherboards, mouse boards, graphics cards, office equipment, printers, copiers, remote controllers, various chargers, calculators, digital cameras, radios, TV motherboards, and limited TV amplifiers., Mobile phones, washing machines, electronic scales, telephones, LED lamps, home appliances: air conditioners, refrigerators, stereos, MP3; industrial equipment, GPS, automobiles, instrumentation, medical equipment, aircraft, military weapons, missiles, satellites, etc. (There is also a PCBA. It is also a circuit board, but it is soft, like the circuit between the flip phone connection cover and the key is a soft circuit board).

The mobile phone motherboard, button board, is a hard board; the connection cable of a sliding phone or a flip phone is an FPC soft board. The remote control generally uses carbon film. The HDI mobile phone board from top to bottom is the radio frequency circuit, the power circuit, the audio circuit, and the logic circuit.

Generally, the heating kettle does not have a circuit board, and the wire bracket is directly connected. The water dispenser has a circuit board. Rice cookers generally have circuit boards. The induction cooker has a circuit board. There is a circuit board in the electric fan, but it is generally used for speed regulation, timing, display, etc., and has no practical effect on the operation of the electric fan.

Which products use double-layer circuit boards and which products use multilayer circuit boards:

It mainly depends on whether the performance requirements of the double-layer circuit board can be met, such as anti-interference ability, wiring, EMC requirements and other performance double-layer circuit boards can be realized, so there is no need to use a multilayer circuit board.

Which is better multi-layer circuit board and single-layer circuit board?

Multilayer circuit boards are currently the most widely used circuit board type in daily life. So what are the application advantages of multilayer PCB circuit boards:

Application advantages of multi-layer PCB circuit boards:

1. The number of wiring layers can be increased, thereby increasing design flexibility;

2. It can form a circuit with a certain impedance and can form a high-speed transmission circuit;

3, high assembly density, small size, light weight, meeting the needs of light and miniaturization of electronic equipment;

4. Due to the high assembly density, the wiring between the components (including components) is reduced, the installation is simple, and the reliability is high;

5. Circuit, magnetic circuit shielding layer can be set, and metal core heat dissipation layer can also be set to meet the needs of special functions such as shielding and heat dissipation;

6. Because the graphics are repeatable and consistent, errors in wiring and assembly are reduced, and equipment maintenance, debugging and inspection time are saved.

With the continuous development of electronic technology and the continuous improvement of electronic equipment requirements in the computer, medical, aviation and other industries, circuit boards are developing in the direction of shrinking volume, reducing quality and increasing density. Single- and double-sided printed circuit boards have been impossible to achieve a further increase in assembly density due to the limitation of available space. Therefore, it is necessary to consider the use of multilayer circuit boards with a higher number of layers and a higher assembly density. Multilayer circuit boards have been widely used in the manufacture of electronic products with their flexible design, stable and reliable electrical performance and superior economic performance.