Detailed understanding of PCBA, PCBA stands for Printed Circuit Board Assembly

The requirements of different assembly products are different, the conditions of the assembly equipment are also different, so it is important to choose the right assembly method, the right assembly method is the basic requirements of efficient, low-cost assembly production, but also the main content of the SMT SMD processing process design. Surface assembly technology refers to the miniaturized components suitable for surface assembly or sheet structure components in accordance with the design of the circuit is placed on the surface of the printed circuit board, and then assembled with flow soldering or wave soldering and other welding processes, composed of electronic components with certain functions.
In the traditional THT printed circuit boards, components and solder joints are located on both sides of the board, while in the SMT SMD printed circuit boards, solder joints and components are located on the same side of the board. Therefore, in the SMT SMD printed circuit boards, through holes are only used to connect the wires on both sides of the board, the number of holes is much smaller, the diameter of the holes is also much smaller, which can make the circuit board assembly density greatly improved. The following is an introduction by our Zero One Solution Limited to the common assembly methods of SMT manufacturers.
SMT manufacturers common assembly methods and characteristics

SMT manufacturers common assembly methods and characteristics

1, SMT single-sided mixed assembly methods

The first category is a single-sided mixed assembly, that is, SMC / SMD and through-hole inserted components (17HC) distributed on a different side of the PCB mixed assembly, but its welding surface is only a single side. This type of assembly are used in single-sided PCB and wave soldering (now generally used double wave soldering) process, there are two specific assembly methods.
- 1.1, First paste method: The first assembly method is known as the first paste method, that is, in the B side of the PCB (soldering surface) first mounted SMC / SMD, and then inserted in the A side of the THC.
- 1.2, Post-Paste Method: The second assembly method is called the post-paste method, is the first PCB in the A side of the insertion of THC, after the B side of the SMD.

2, SMT double-sided hybrid assembly method

The second type is double-sided mixed assembly, SMC / SMD and T.HC can be mixed distribution on the same side of the PCB, at the same time, SMC / SMD can also be distributed on both sides of the . PCB. Double-sided mixed assembly uses double-sided PCB, double wave soldering or reflow soldering. In this type of assembly there is also a first paste or post-paste SMC / SMD difference, generally based on the type of SMC / SMD and the size of the PCB reasonable choice, usually using the first paste method is more. There are two commonly used assembly methods for this type of assembly.
- 2.1, SMC/SMD and 'FHC same side way: SMC/SMD and THC on the same side of the PCB.
- 2.2, SMC/SMD and 'iFHC different-side approach: where the surface-assembled integrated chip (SMIC) and the THC are placed on side A of the PCB, while the SMC and the small outline transistor (SOT) are placed on side B. The SMC/SMD and iFHC different-side approach, where the SMC/SMD and the THC are placed on side B of the PCB.
The assembly density is quite high due to the fact that the SMC/SMD is mounted on one or both sides of the PCB and the leaded components, which are difficult to assemble on the surface, are inserted into the assembly.

SMT SMD assembly and its process flow depends mainly on the type of surface-mounted assembly (SMA), the type of components used and the conditions of the assembly equipment. Broadly speaking, SMA can be divided into single-sided mixed assembly, double-sided mixed assembly and full surface assembly of three different types of six assembly methods. Different types of SMA assembly method is different, the same type of SMA assembly method can also be different.

Zero One Solution Limited, one-stop solution provider in the field of PCB for thirteen years, can provide you with high-quality SMT chip processing services, as well as a wealth of experience in PCBA processing, PCBA package for you to solve the problem. Zero One Solution Limited provides printed circuit board layout, printed circuit board manufacturing, printed circuit board assembly, component procurement services.