PCB assembly process trends

In 2019, the development of electronic PCBA products in the direction of short, small, light, thin and multi-functional, led to the increasing integration of semiconductor integrated circuits, the smaller and smaller SMC, and the narrower pin spacing of SMD. The PCB assembly density of electronic products is getting higher and higher, and the assembly difficulty is getting bigger and bigger. For some products and some occasions, traditional through-hole component insertion process, wave soldering, and manual soldering have been unable to do anything. SMT chip processing has become the mainstream technology of electronic manufacturing.

The development trend of process technology is reflected in the following aspects.

At present, PCB assembly mainly uses printed solder paste reflow soldering process, and reflow soldering is still the mainstream process of SMT chip processing.

Wave soldering is used when mixing single panels and having more through-hole components.

In the mixed board with fewer through-hole components, the through-hole component reflow process is also being used more and more.

With the implementation of lead-free soldering, the wave soldering process is becoming more and more difficult, so selective wave soldering is becoming more and more widely used.

ACA, ACF and ESC technology applications.

Flip-chip FC, wafer-level CSP, WLP and other new packaging assembly technology.

The application of 3D stacked POP technology.

Embedded IC, wafer, and micro passive components in the polymer. Components such as R (resistance), C (capacitance), L (inductance), and filter are embedded in the ceramic substrate and in the PCB substrate to form a composite component or a composite printed board.

FPC has broken through the traditional concept of interconnected technology and has been widely used in various fields.

LED lighting is an important part of the energy-saving and environmental protection industry. It is widely used in display panels, light bulbs, lamps, street lamps, advertising and decorative light strings. It has also developed rapidly in recent years.