Surface-mount technology or SMT is a method for producing electronic circuits in which the components are mounted or placed directly onto the surface of printed circuit boards (PCBs). In PCB industry it has largely replaced the through-hole technology construction method of fitting components with wire leads into holes in the circuit board. Surface-mount technology has several competitive advantages, and they are listed as follows:
1. The cost of surface-mount technology can lower 30%~50% than other technologies from saving materials, energy, equipment, labor, time, etc.
2. The efficiency of SMT can easily be increased by using auto machine.
3. SMT has good high-frequency performance which can largely reduce the interference of radio-frequency and electromagnetism.
4. SMT is more reliable that it has high resistance capability, and low soldering defect rate.