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PCBA Tech
The key to the smt manufacturing process
PCBA Tech
The key to the smt manufacturing process

The key to the smt manufacturing process

2021-09-23
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Author:Will

smt is one of the most popular manufacturing processes in the electronics assembly industry, meeting the requirements for easy mass production of mobile phones and computers. PCBA assembled by smt can be mass-produced automatically, with high assembly density and light weight. The welded joints and parts are on the same plane as the top plate, and the welding process is reflow welding. The use of THT in the automotive electronics industry cannot be changed in a short time, but it is gradually being replaced by the consumer electronics industry. The distance between the PCBA electronic components produced in the THT process is large and the circuit board area is increased. The special feature is that the components and solder connections are placed on both sides of the circuit board.

smt manufacturing process

Reflow soldering is a special smt process in which an inert circulating gas is set in the reflow soldering machine to provide a hot gas atmosphere. The solder paste scattered on the pad is re-dissolved with cooling air, and it is finally confirmed that only one side of the reflow soldering can be soldered at a time. Double-sided SMD requires a second reflow soldering. Since the melting point of the solder paste after curing is higher than the reflow temperature, the smt manuscript on the back will not fall off, which has a special effect on the preservation and reference of the design.


Certain requirements that require both smt and THT cannot avoid the mixed use of reflow soldering and wave soldering. Please note that wave soldering must be done after reflow soldering. First of all, since it is filled with hot air from the reflow soldering machine, it is first passed through wave soldering and then injected into the reflow soldering machine to apply solder paste again. Secondly, most of the electronic components assembled in our THT process have pins, and the arrangement on the conveyor belt is uniform. This saves us from worrying about chaos in the production process.


In terms of automotive electronics, we have entered the field of automotive electronics. smt is one of the key components of PCBA electronic equipment, PCBA electronic equipment is currently the most popular assembly process. smt manufacturing is the backbone of electronic products. Electronic products without smt can be said to be incomplete electronic products. The circuit board production of every electronic product can basically be said to be made using smt electronic technology.