Composition of PCB board

At present, the circuit board is mainly composed of the following:

Circuit and Pattern: The circuit is used as a tool for communicating between the original parts. In the design, a large copper surface will be additively designed as the grounding and power layer. The lines and drawings were made at the same time.

Dielectric layer (Dielectric): Used to maintain insulation between lines and layers, commonly known as the substrate.

Through hole/via: Through hole can make more than two levels of lines Through each other, the larger Through hole is used as part plug-in, in addition to the non-through hole (NPTH) is usually used as surface mount positioning, assembly for fixing screws.

(Solder resistant /Solder Mask) : not all of the copper surface to eat tin parts, so the non-tin eating area, will be printed a layer of isolation from the copper surface to eat tin material (usually epoxy resin), to avoid short circuit between non-tin eating lines. According to different technology, divided into green oil, red oil, blue oil.

Legend /Marking/Silk screen: This is not necessary. Its main function is to mark the name and position box of each part on the circuit board, which is convenient for maintenance and identification after assembly.

Surface Finish: because the copper Surface in the general environment, it is easy to oxidize, resulting in tin can not be on the tin (poor soldering), so it will be protected on the copper Surface to cover tin. The ways of protection are HASL, ENIG, Silver, Tin, OSP, which have their own advantages and disadvantages, and are collectively called surface treatment.

Characteristics of PCB

It can be densified.

For decades, the high density of printed boards has been able to develop with the improvement of integrated circuit integration and installation technology.

High reliability.

Through a series of inspections, tests and aging tests, the PCB can be guaranteed to work reliably for a long time (service life, generally 20 years).

Designability.

For all kinds of performance requirements of PCB (electrical, physical, chemical, mechanical, etc.), we can realize the design of printed board through design standardization, standardization, etc., which is short in time and high efficiency.

Productive.

Adopt modern management, can carry out standardization, scale (quantity), automation and other production, to ensure the consistency of product quality.

Testability.

Set up a relatively complete test method, test standards, a variety of test equipment and instruments to detect and identify the PCB product qualification and service life.

Assemblability.

PCB products are not only convenient for standardized assembly of various components but also can be automated and large-scale mass production. At the same time, PCB and various components assembly parts can also be assembled into larger parts, systems, until the complete machine.

Maintainability.

Because PCB products and various component assembly parts are standardized in design and mass production, these parts are standardized as well. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can work quickly. There are, of course, many more examples to go on. Such as miniaturization of the system, lightweight, signal transmission speed and so on.

Integrated circuit features

Integrated circuit has the advantages of small size, lightweight, less lead and welding points, long life, high reliability, good performance, and so on. At the same time, it has low cost and is convenient for mass production. It is not only widely used in industrial and civil electronic equipment such as recorders, TV sets, computers, but also in military, communication, remote control and other aspects. With integrated circuit to assemble electronic equipment, its assembly density than transistors can be raised tens of times to thousands of times, the stable working time of equipment can also be greatly improved.

The difference between PCB board and integrated circuit

Integrated circuit is generally referred to the integration of the chip, like the motherboard on the North Bridge chip, CPU internal, are called integrated circuit, the original name is also called integrated block. And the printed circuit refers to the circuit board that we usually see, and printing welded chips on the circuit board.

Integrated circuits (ICs) are welded to PCB boards;

The PCB version is the carrier of an integrated circuit (IC).

A Printed circuit board, or PCB, is a Printed circuit board.

Printed circuit boards appear in almost every kind of electronic device.

If there is an electronic component in a particular device, the printed circuit board is mounted on a PCB of various sizes.

In addition to fixing all kinds of small parts, the main function of the printed circuit board is to carry on the electrical connection of each part on the top.

Simply put, integrated circuit is a general circuit integrated into a chip, it is a whole, once it has internal damage, the chip is also damaged, and PCB is able to solder components by themselves, if broken, you can replace components.

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