What are the types of PCB What are the types of PCB classifications

Classified according to the number of circuit layers: it is divided into single-sided, double-sided and multi-layer boards.

Common multi-layer boards are generally 4-layer boards or 6-layer boards, and complex multi-layer boards can reach more than a dozen layers.

PCB board. There are three main types of divisions:

Single-sided. Single-sided boards On the most basic PCB, parts are concentrated on one side and wires are concentrated on the other. Because the wires only appear on one side, this type of PCB is called a single-sided.

Because single-sided boards have many strict limitations in designing the circuits (because there is only one side, the wiring cannot cross each other and must go around their own paths), so only early circuits use this type of board.

Double-sided. Double-sided boards are circuits that are routed on both sides, but to use wires on both sides, there must be a proper circuit connection between the two sides. This "bridge" between circuits is called a VIA.

A pilot hole is a small hole in the PCB that is filled or coated with metal, and it can be connected to wires on both sides. Because double-sided boards are twice as large as single-sided boards, and because the wiring can be staggered (can be wound to the other side), it is better suited for more complex circuits than single-sided boards.

Multi-layer boards. Multi-layer boards In order to increase the area that can be routed, multi-layer boards use more single- or double-sided wiring boards. With a double-sided as the inner layer, two single-sided as the outer layer or two double-sided as the inner layer, two single-sided as the outer layer of the printed circuit board, through the positioning system and insulation bonding materials alternately together and the conductive graphics are interconnected according to the design requirements of the printed circuit board becomes a four-layer and six-layer printed circuit board.

, also known as multilayer printed circuit boards. The number of layers on the board represents the number of independent wiring layers, usually even, and contains the outermost two layers. Most of the motherboards.

They are all 4 to 8 layers of structure, but technically it is theoretically possible to achieve nearly 100 layers of PCB boards. Large-scale supercomputers.

Most motherboards use quite a few layers, but because these computers can be replaced by clusters of many ordinary computers, ultra-multilayer boards are gradually being used. 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 can still see it.

Classification is based on hard and soft.

It is divided into ordinary circuit board and flexible circuit board.

PCBs are also known as printed circuit boards, and PCBs are found in many electronic products. Now that technology is developing faster and faster, the requirements for PCB are getting higher and higher, so what are the classifications of PCB?

PCBs can be divided into:

Single-sided. Double-sided.

Multi-layer boards. Aluminum substrates.

Single-sided. The parts are only on one side, and the wires are on the other side, so there are many limitations in terms of design, so the probability of use is relatively small.

Double-sided. Unlike single-sided boards, double-sided boards have wiring on both sides, but if you want to use wires on both sides, you need to have circuits connected on both sides.

The PCB has small holes in the metal that allow the wires on both sides to be connected. Double-sided boards have a larger area than single-sided boards and can be routed on both sides, so double-sided boards are more suitable for circuits that are more complex than single-sided boards.

Multi-layer boards. As the name suggests, a multilayer board is a wiring board with multiple layers. A printed circuit board with one double-sided inner layer and two single-sided outer layers or two double-sided inner layers and two single-sided outer layers.

Aluminum substrates. It is a unique metal-based copper clad laminate, which is composed of metal circuit board material, copper foil, thermal conductive insulation layer and metal substrate.

Aluminum substrates are a bit plentiful and have good thermal conductivity, electrical insulation properties, and machinability properties.

PCB inks are mainly divided into three types: three-line, solder mask, and character ink.

The line ink is used as a barrier layer to prevent corrosion of the line, and to protect the line during etching, and it is generally a liquid photosensitive type. There are two kinds of acid corrosion resistance and alkali corrosion resistance, alkali resistance is more expensive, this layer of ink should be dissolved with alkali after corroding out of the line.

Solder mask ink is used to protect the line after the line is done. There are liquid photosensitive, thermal curing, and ultraviolet hardening type, which retains the pad on the board to facilitate the soldering of components and play the role of insulation and anti-oxidation.

Character ink is used to mark the surface of the board, such as marking the symbol of the component or something, which is generally white.

In fact, there are other inks, such as: peelable ink, which is to protect the part that does not need to be treated when doing copper plating or surface treatment, and then can be torn off; Silver paste, ink, etc.

According to the material, we can divide it into hard board, soft board, soft and hard version, or rigid board, flexible board, rigid flex board, etc. Bendability is the main feature of the flexible board, but it is not so soft to the touch, and the flexible board is mostly used in terminal products, such as mobile phones, etc.!

According to the classification of media, it can be divided into hard board and soft board (FPC), PCB contains FPC, daily computer motherboard belongs to hard board, like mobile phone display cable belongs to flexible board.

According to the classification of levels, on the single-sided, double-sided, multi-layer, single-sided single-sided is mostly used for power supply, lighting, double-sided is extensive, multi-layer generally refers to more than 4 layers of boards, the most in the communications industry, before the Internet did not say that the Apple mobile phone motherboard is a 64-layer board...

PCB has single-sided, double-sided, 4-layer, 6-layer, etc., and there are many impedance HDIs.

1.In terms of the number of layers, it is divided into single-sided, double-sided and multi-sided.

2.In terms of production process, it is divided into: FPC, PCB and PCB (as the name suggests, it is a combination of soft board and hard board).

3.In terms of drilling methods, it is divided into: through-hole plate and HDI plate (the highest order of HDI plate is Anylayer, and all holes are laser holes).

PCB type.

a.Divided by material.

a.Organic.

Phenolic resins, glass fiber epoxy resins, polyimide, BT epoxy, etc. are all of them.

b.Inorganic material.

Aluminum, copper-invar-copper, ceramic, etc. are all included. It mainly takes its heat dissipation function.

b.Distinguish by the soft and hard of the finished product.

a.Rigid PCB

b.The flexible PCB is shown in Fig.

c.The rigid-flex PCB is shown in Figure CDivided by structure.

d.According to the use: communication, consumable electronics, military computers, semiconductors, electrical test boards..., see Figure BGA

There is another kind of injection molded stereo PCB, which is not introduced here because of its small use.

This document is in it, you can refer to it.

PCB generally refers to the printed circuit board, also known as the printed circuit board, which is an important electronic component, the support body of electronic components, and the carrier of the electrical interconnection of electronic components. Since it is made using electronic printing, it is called a "printed" circuit board.

Almost every kind of electronic equipment, from electronic watches and calculators to computers, communication electronic equipment, and military systems, as long as there are electronic components such as integrated circuits, in order to make the electrical interconnection between the various components, printed boards are used.

The printed circuit board is composed of an insulating base plate, connecting wires, and pads for assembling and welding electronic components, and has the dual role of conductive lines and insulating base plates.

It can replace the complex wiring and realize the electrical connection between the components in the circuit, which not only simplifies the assembly and welding work of electronic products, but also reduces the wiring workload under the traditional way, and greatly reduces the labor intensity of workers; Moreover, it reduces the size of the whole machine, reduces the cost of products, and improves the quality and reliability of electronic equipment.

What's inside a PCB? Smartphones have dozens of components, all connected by a large labyrinth of wires inside the PCB! So how exactly does a PCB work?

PCB, Chinese name for printed circuit board, also known as printed circuit board, is an important electronic component, is the support of electronic components, is the carrier of electrical connection of electronic components. Since it is made using electronic printing, it is called a "printed" circuit board.

After the electronic equipment adopts the printed board, due to the consistency of the same type of printed board, the error of manual wiring is avoided, and the electronic components can be automatically inserted or placed, automatically soldered, and automatically detected, which ensures the quality of electronic equipment, improves labor productivity, reduces costs, and is convenient for maintenance.

What are the types of PCB plates, NEMA standards are as follows:

FR-1: flame retardant copper clad foil phenolic paper laminate. IPC4101 Specification No. 02; tg n/a;

FR-4:1) Flame retardant copper clad foil epoxy E glass fiber cloth laminate and its adhesive sheet material. IPC4101 Specification No. 21; tg≥100℃;

2) Flame retardant copper clad laminate modified or unmodified epoxy E glass fiber cloth laminate and its adhesive sheet material. IPC4101 Specification No. 24; tg 150℃~200℃;

3) Flame retardant copper clad foil epoxy PPO glass cloth laminate and its adhesive sheet material. IPC4101 Specification No. 25; tg 150℃~200℃;

4) Flame retardant copper clad foil modified or unmodified epoxy glass cloth laminate and its adhesive sheet material. IPC4101 Specification No. 26; tg 170℃~220℃;

5) Flame retardant copper clad foil epoxy E glass cloth laminate (used for catalytic addition method). IPC4101 Specification No. 82; tg n/a;

There are the following types of plates that are used more in actual projects.

1.Fiberglass epoxy board. fr-4

2.Composite epoxy panels. cem-3

3.Paper fiber epoxy board. cem-1

In addition, ceramic substrate PCBs and aluminum substrate PCBs are often used in environments where enhanced heat dissipation is required.

In some special applications, there are also copper substrates, iron substrate PCBs.

Common materials for rigid PCBs include phenolic paper laminates, epoxy paper laminates, polyester glass felt laminates, and epoxy glass cloth laminates; Common materials for flexible PCBs include polyester film, polyimide film, and fluorinated ethylene propylene film.

Common thickness ,,, for rigid PCBs, etc. The common thickness of flexible PCB is that a thickened layer will be added behind the part to be welded, and the thickness of the thickened layer will be different.

Raw materials: Copper clad laminate is the substrate material used to make printed circuit boards. It is used as a support for various components and can be used to make electrical connections or electrical insulation between them.

Aluminum substrate: PCB aluminum substrate (metal base heat sink includes aluminum substrate, copper substrate, iron substrate) is a low-alloying Al-MG-SI series of high plasticity alloy plate, which has good thermal conductivity, electrical insulation performance and mechanical processing performance, and is now the mainstream aluminum substrate.

Do you mean the finished circuit board, and what substrate is used?

PCB Chinese name printed circuit board, is an evolution of movable type printing, as long as the electronics factory will use circuit boards, Hubei Central China PCB Industrial Park some is to do PCB processing, China took the lead in inventing, Western countries to carry forward.