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Surface Mount Device
In electrical engineering, a Surface Mount Device (SMD) is a component that can be attached to a printed circuit board by Surface Mount Technology (SMT).
Surface Mount Devices are usually placed on a printed circuit board by machine, since due to the ongoing miniaturization and the high number of SMD components per board, precise placement or hand soldering is hardly possible or not economical.
The terms Surface Mount Component, SMC and SMD are also used synonymously with Surface Mount Device.