Benefits of SMT
There are many reasons SMT has become so popular since its introduction many years ago. Not only are there cost benefits to utilising SMT, but it is also faster than traditional through-hole technology.
Due to the smaller components, more can fit on the PCB. As components are applied directly to the board, they can be placed on both sides, maximising components and use of PCB. Smaller components also mean SMT is mostly cheaper than through-hole, with equivalent pieces costing less for SMT.
Although placement error may seem more likely with smaller components, errors are quickly fixed with molten solder creating a pull to align with solder pads. This is preferable to more complicated processes to fix errors.
Without wire attachments, the radiation loop is smaller in SMT than through-hole, meaning there are lower radiated emissions. Also, due to the lack of wires, less holes have to be drilled, increasing usable space on the PCB.
One of the largest benefits to SMT is it is appropriate technology for the times. As electronic device continues to become more complex and space is reduced, the demand for SMT increases.