The term PCBA China generally refers to the process in which there is the attachment of electronic components to a printed circuit board to create a fully functional completed printed circuit assembly. In PCB assembly there are two types of construction used, through-hole construction and surface-mount construction.
The process of through-hole construction includes the leads of components being pushed through holes in the PCB and soldered to pads on the other side. It can be performed by hand or with the use of mounting machines. For almost every component on all circuit boards and starting from the 1950s until surface-mount construction became popular in the 1980s, through-hole replaced point-to-point construction and was used.
Surface-mount construction includes components that are attached directly to the surface of a PCBA Assembly China. Surface-mount components can be much smaller when compared to their through-hole equivalents as they have much smaller leads or even none at all.
Over the older style, through-hole components surface-mount components have several benefits. As mentioned above they may be very small but they can also have many more connections. They also allow for much faster and simpler assembly and components that can be placed on both sides of the board.
It is fair to say that in modern PCB assemblies’ surface-mount components are preferred but both types are still used in most cases. There are still a few components that are only available in one type or the other and the connection that may sometimes be required gives some extra strength by through-hole construction.
Using several different soldering methods components are attached to PCBs. With machine placement and most likely reflow ovens, large-scale production is usually done. With the help of a microscope and precision tools very tiny components may be attached by highly skilled professionals.
Once PCBA China assembly is complete and the power is off the finished circuit is usually tested by visual inspection to check the quality of the construction and analog signature analysis. Whereas circuit testing checks voltage and frequency while the power is on and finally performs a functional test to ensure that the circuit operates in the way it was intended to.
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