What is SMD, and what is the difference between SMD and SMT

SMT chip processing and production often use SMD, what is SMD? What is the difference between SMD and SMT?

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 electronic circuit board production, the via assembly is completely completed manually. After china PCB the introduction of the first automated machines, they can place some simple pin components, but complex components still need to be manually placed before reflow soldering. Surface mounted components (Surface Mounted components) mainly include rectangular chip components, cylindrical chip components, composite chip components, and special-shaped chip components.

Features of SMD:
1. High assembly density, small size and light weight of electronic products. The volume and weight of chip components are only about 1/10 of that of traditional plug-in components. Generally, after SMT is adopted, the volume of electronic products is reduced by 40% to 60%, and the weight is reduced by 60%. %~80%.
2. High reliability and strong anti-vibration ability. The defect rate of solder joints is low.
3. Good high frequency characteristics. Reduce electromagnetic and radio frequency interference.
4. It is easy to realize automation and improve production efficiency. Reduce costs by 30%~50%. Save materials, energy, equipment, manpower, time, etc.

Classification of SMD:
Mainly chip transistors and integrated circuits
Integrated circuits include SOP, SOJ, PLCC, LCCC, QFP, BGA, CSP, FC, MCM, etc.

What is the difference between SMT PCB and SMD:
To put it simply, smd is the patch component, smt is the patch processing.

SMT: Surface Mount Technology (Surface Mount Technology) (abbreviation for Surface Mount Technology) is currently the most popular technology and process in the electronics assembly industry.

SMD: Surface mount device.

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