Advantages of SMT
The main advantage for SMT is to allow automated production and soldering. This is cost and time saving and also allows for a far more consistent circuit. The savings in manufacturing costs are often passed along to the customer – making it beneficial for everyone.
Less holes need to be drilled on circuit boards
Costs are lower than through-hole equivalent parts
Either side of a circuit board can have components placed on it
SMT components are far smaller
Higher component density
Better performance under shake and vibration conditions.