The components used in the surface mount SMD technology for 31.25mm Soft LED Mesh Curtain displays include Surface Mounted Components (SMC for short) and Surface Mounted Devices (SMD for short).

Among them, SMD mainly includes: diodes, transistors, integrated circuits and other patch semiconductor devices. SMC mainly includes: rectangular SMD components, cylindrical SMD components, composite SMD components, and special-shaped SMD components;

SMC and SMD are collectively referred to as surface mount components or patch components.

The performance of the whole machine composed of surface mount technology depends on the performance of the chip components and the surface assembly structure process, so when designing the circuit, it is necessary to put forward certain electrical performance technical index requirements for the chip components that are the same as traditional electronic components In addition, other more and stricter requirements need to be put forward. These requirements include the following.

(1) Size standard. The dimensional accuracy of SMD components should match the dimensional accuracy of surface mount technology and surface mount structures so that they can be interchanged.

(2) Shape standard. Easy to locate and suitable for automated assembly.

(3) The electrical performance meets the standardization requirements, and the repeatability and stability are good.

(4) The mechanical strength meets the process requirements of the assembly technology and the performance requirements of the assembly structure.

(5) The heat resistance of the materials in the SMD components should be able to withstand the temperature shock of the welding process.

(6) The chemical properties of the surface layer can withstand the washing of organic solutions

(7) The external structure is suitable for tape packaging, and the model or parameters are easy to identify.

(8) The location and material properties of the external leads are conducive to the automated welding process.