PCBA
PCBA is the abbreviation of printed circuit board + assembly in English, that is to say, the whole process of PCB blank board through SMT, and then through dip plug-in. This is a common writing method in China, while the standard writing method in Europe and the United States is PCB 'a, with diagonal dot added. This is called the official idiom. When we communicate with foreign customers or promote, they often ask what PCBA means.
SMT and dip are both ways to integrate parts on PCB board. The main difference is that SMT does not need to drill holes on PCB, but in dip, it needs to insert the pin pin pin into the drilled hole.
SMT（Surface Mounted Technology）
Surface mounting technology mainly uses the mounting machine to mount some micro and small parts on the PCB board. Its production process is: PCB board positioning, printing solder paste, mounting machine mounting, reflow oven and manufacturing inspection. With the development of science and technology, SMT can also mount some large-size parts, for example, some large-size mechanism parts can be mounted on the motherboard.
SMT integration is very sensitive to positioning and part size. In addition, the quality of solder paste and printing quality also play a key role.
Dip is "plug-in", that is, to insert parts on PCB board. Because the parts are large in size and are not suitable for mounting or SMT technology can not be used in the production process of manufacturers, plug-in is used to integrate parts. At present, there are two ways to realize the manual plug-in and robot plug-in in the industry. The main production processes are: sticking back glue (to prevent tin plating to the place where it should not be), plug-in, inspection, wave soldering, plate brushing (to remove the stains left in the process of furnace passing) and manufacturing inspection.
PCB
PCB (printed circuit board), 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. Because it is made by electronic printing, it is called "printed" circuit board.
After using PCB for electronic equipment, due to the consistency of the same kind of PCB, the manual wiring error can be avoided, and the electronic components can be automatically inserted or pasted, automatically soldered, and automatically detected, so as to ensure the quality of electronic equipment, improve labor productivity, reduce cost, and facilitate maintenance.
PCB can be more and more widely used, because it has many unique advantages, as follows.
High density. For decades, PCB high density can develop with the improvement of IC integration and installation technology.
High reliability. Through a series of inspection, test and aging test, PCB can work reliably for a long time (generally 20 years).
Designability. For PCB performance requirements (electrical, physical, chemical, mechanical, etc.), PCB design can be realized through design standardization, standardization, etc., with short time and high efficiency.
Producibility. With modern management, standardization, scale (quantity), automation and other production can be carried out to ensure the consistency of product quality.
Testability. Established a relatively complete test method, test standards, various 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 for automatic and large-scale mass production. At the same time, PCB and various component assembly parts can also be assembled to form larger parts, systems, and even the whole machine.
Maintainability. As PCB products and various component assembly parts are designed and produced in a standardized way, these parts are also standardized. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can be restored quickly. Of course, there are more examples. Such as making the system miniaturization, lightweight, high-speed signal transmission and so on.
The difference between PCB and PCBA
PCB refers to the circuit board, and PCBA refers to the circuit board plug-in assembly, SMT process.
One is finished board, the other is bare board
PCB (printed circuit board) is called "printed circuit board", which is made of epoxy glass resin. According to the number of signal layers, it can be divided into 4, 6 and 8 layers, and 4 and 6 layers are the most common. Chip and other chip components are pasted on the PCB.
PCBA may be understood as a finished circuit board, that is, PCBA can only be considered after all the processes on the circuit board have been completed.
PCBA=Printed Cirruit Board +Assembly。
That is to say, PCB blank board is put on SMT, and then through the whole process of dip plug-in, called PCBA for short.
Printed circuit board (PCB) is the abbreviation of printed circuit board. It is usually called printed circuit that is made of printed circuit, printed components or the conductive pattern formed by the combination of printed circuit board and printed circuit board. The conductive pattern that provides electrical connection between components on insulating substrate is called printed circuit. In this way, the printed circuit or the finished board of printed circuit is called printed circuit board, also called printed circuit board or printed circuit board.
There are no parts on the standard PCB, which is often called "printed wiring board (PWB)".
