Surface Mount Technology (SMT) is a type of electronic component package where the electronic component is located on the same side of a Printed Circuit Board (PCB) as the electrical connection. Most electronic components can be divided into two categories - through hole (TH) and surface mount (SM). Through-hole components have been used for many years and are designed to be loaded on one side of a printed circuit board and soldered on the other side. Surface mount components are designed to be loaded and soldered on the same side of the PCB. Surface Mount Technology has several important benefits over though hole technology:

• Smaller physical size for the same electrical function
• Cost of part is cheaper
• Less parasitic (unwanted) effects
• Faster for automatic machines to place

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