PCB board
The Chinese name of PCB (Printed Circuit Board) is printed circuit board, also known as printed circuit board. It is an important electronic component, a support for electronic components, and a carrier for electrical connections of electronic components. Because it is made using electronic printing, it is called a "printed" circuit board.
After electronic equipment adopts printed boards, due to the consistency of similar printed boards, errors in manual wiring are avoided, and automatic insertion or placement of electronic components, automatic soldering, and automatic detection can be realized, ensuring the quality of electronic equipment. , Improve labor productivity, reduce costs, and facilitate maintenance.
The reason why PCB boards can be used more and more widely is because it has many unique advantages, which are summarized as follows.
Manufacturability: With modern management, standardization, scale (quantity), automation and other production can be carried out to ensure the consistency of product quality. High density: For decades, the high density of printed circuit boards has been developed with the improvement of integrated circuit integration and the advancement of installation technology.
High reliability: Through a series of inspections, tests and aging tests, the PCB board can be guaranteed to work reliably for a long time (use period, generally 20 years).
Testability: Establish relatively complete test methods, test standards, various test equipment and instruments to detect and identify the qualification and service life of PCB products.
Designability: Requirements for various performances (electrical, physical, chemical, mechanical, etc.) of PCB boards can be realized through design standardization, standardization, etc., to achieve printed board design, with short time and high efficiency. Assemblability: PCB board 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 component assembly components can also be assembled to form larger components, systems, and even complete machines.
Maintainability: Since PCB board products and various component assembly parts are designed and produced in a standardized manner, these parts are also standardized. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can be quickly restored. Of course there are more examples. Such as making the system miniaturized, lightweight signal transmission high-speed and so on.
PCBAs
PCBA is the abbreviation of Printed Circuit Board+Assembly in English, that is to say, the whole process of PCB empty board passing through SMT upper part and then DIP plug-in, referred to as PCBA. This is a commonly used way of writing in China, while the standard way of writing in Europe and the United States is PCB A, with a slanted point added. This is called the official idiom. When we communicate or promote with foreign customers, they often ask what PCBA means.
Both SMT and DIP are ways to integrate parts on the PCB. The main difference is that SMT does not need to drill holes on the PCB, and DIP needs to insert the PIN pins of the parts into the drilled holes. SMT (Surface Mounted Technology)
The surface mount technology mainly uses the placement machine to mount some tiny parts on the PCB board. The production process is: PCB board positioning, printing solder paste, placement machine placement, reflow oven and finished inspection. With the development of technology, SMT can also mount some large-size parts, for example, some larger-sized mechanical parts can be mounted on the motherboard.
SMT integration is very sensitive to positioning and the size of parts. In addition, the quality of solder paste and printing quality also play a key role.
DIP is "plug-in", which is to insert parts on the PCB board; because the parts are large in size and not suitable for placement or the manufacturer's production process cannot use SMT technology, the parts are integrated in the form of plug-ins. At present, there are two implementation methods of manual plug-in and robot plug-in in the industry. The main production process is: sticking back glue (to prevent tin from being plated where it should not be), plug-in, inspection, wave soldering, and brushing (removing the tin in the furnace). Stains left in the process) and finished inspection.
Comparison of PCB board and PCBA
The difference between PCB board and PCBA
PCB board refers to circuit board, and PCBA refers to circuit board plug-in assembly, SMT process. One is a finished board and the other is a bare board
PCB (Printed Circuit Board) is called "printed circuit board". It is made of epoxy glass resin material. most common. SMD components such as chips are attached to the PCB.
PCBA may be understood as a finished circuit board, that is, PCBA can only be counted after the processes on the circuit board are completed. PCBA=PrintedCirruitBoard+Assembly.
That is to say, the empty PCB board goes through the SMT upper part, and then goes through the whole process of DIP plug-in, referred to as PCBA.
PCB (Printed Circuie Board) is the abbreviation of printed circuit board. Usually, the conductive pattern made of printed circuit, printed component or a combination of the two is called printed circuit on the insulating material according to the predetermined design. The conductive pattern that provides electrical connection between components on an insulating substrate is called a printed circuit. In this way, the finished board of printed circuit or printed circuit is called printed circuit board, also known as printed board or printed circuit board.
There are no parts on the standard PCB, and it is often called "Printed Wiring Board (PWB)".
