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What is the function of SMD?

SMD: It is the abbreviation of Surface Mounted Devices, which means: surface mount device, which is one of SMT (Surface Mount Technology) components. In the initial stage of custom pcb fabrication production, SMT&Through-Hole Assembly is completely completed manually. After the first batch of Wave Solder for PCBA is launched, they can place some simple pin components on the PCB surface, but complex components still need to be manually placed before Wave Solder for PCBA can be carried out. Surface mounted components (Surface Mounted components) mainly include rectangular chip components, cylindrical chip components, composite chip components, and special-shaped chip components.