PCBA processing is a complete set of processing processes such as PCB boarding, SMT chip processing, DIP plug-in processing, quality inspection, testing, assembly, etc., to form a finished electronic product, this processing process is called PCBA processing, and PCBA can also be said to be the processed circuit board. There are many kinds of PCBA, and there are several assembly methods for PCBA processing.
1. Single-sided mixed assembly.
The circuit board used for assembly is a single-sided PCB, and the single-sided mixed assembly means that the SMT chip and DIP plug-in components are distributed on different sides of the PCB, and the soldering surface is a single side, and the chip surface is another single side. This type of assembly method uses single-sided PCB and wave soldering process, and there are two specific assembly methods:
1. Paste first and then insert method: that is, first mount SMC SMD on the B side of the PCB, and then insert THC on the A side.
2. Plug in and paste the method: that is, first insert THC on the A side of the PCB, and then mount SMD on the B side.
2. Double-sided mixed packaging.
The circuit board used for the assembly of this PCBA processing is a double-sided PCB. SMT patches and DIP inserts can be mixed and distributed on the same or both sides of the PCB. In this type of assembly, there is also a difference between the first and the last SMC SMD. Generally, according to the type of SMC SMD and the size of the PCB, it is reasonable to choose, and the first paste method is usually used. There are two commonly used assembly methods for this class:
1. SMT components and DIP components are on the same surface: SMT SMT components and DIP plug-in components are on the same side of the PCB; DIP insert elements are available on one or both sides. This kind of plug-in dip is generally used to paste SMC SMD first.
2. There are SMT chip components on one and both sides of the DIP element: put the surface assembly integrated chip (SMIC) and THT on the A side of the PCB, and put the SMC and small outline transistor (SOT) on the B side.
3. Full surface assembly.
All the circuit boards assembled by this PCBA processing are single-sided and double-sided PCBs, and there are only SMT chip components and no THT components on the PCB. Since the components have not yet been fully SMTIZED, there are not many such assembly forms in practical applications. There are two ways to assemble this type:
1. Single-sided surface assembly.
2. Double-sided surface assembly.
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