SMT is Surface Mount Technology (Surface Mounted Technology) (abbreviation for Surface Mounted Technology), which is the most popular technology and process in the electronic assembly industry. It is a kind of surface mount components without pins or short leads (referred to as SMC/SMD, Chinese called chip components) installed on the surface of the printed circuit board (Printed Circuit Board, PCB) or the surface of other material substrates, Circuit assembly technology that is soldered and assembled by reflow soldering and other methods. It has the characteristics of high assembly density, small size and light weight of electronic products. The volume and weight of SMD components are only about 1/10 of those of traditional plug-in components, the volume of electronic products is reduced by 40%~60%, and the weight is reduced by 60%~80%. At the moment when portable electronic devices are prevalent, SMT process is the electronic manufacturing industry. The most widely used process solution.
SMT surface mount process process
PCB marking (or labeling) dust removal and electrostatic removal -> printing solder paste or glue -> SPI inspection -> placement machine -> AOI inspection before furnace -> AOI and X-ray inspection and repair of solder joints after furnace -> process Finished packaging or online directly into the THT through-hole assembly process
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