SMT, that is the surface mount technology of the printed circuit boards is the technique. In this method, the components are mounted directly on the surface of the PCB. However, it increases the risk of errors because of the denser packing of the PCB board. The SMT has usually smaller components. It has small leads or no leads at all.

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Printed circuit boards started growing in the 1970s and 1980s. At that time, all PCBs were built by through-hole technology. Later, it was discovered this THT can be problematic to create the boards. And, It may not work properly in the future. To eradicate those problems surface mount technology got introduced. Now, instead of wires or leads, components can be soldered on the board. As a result, devices or circuits have got far better from the past.