SMD stands for Surface Mounted Device. An SMD is any electronic component that is made for use with SMT, or Surface Mount Technology. SMT was developed to meet the ongoing desire for printed circuit board (PCB) manufacturers to use smaller components and to be faster, more efficient, and cheaper when assembling components to the PCBs.
SMDs are smaller than their traditional through-hole counterparts. They are often square, rectangular or oval in shape, with very low profiles. Instead of wire leads that go through the PCB, SMDs have small leads or pins that are soldered to pads on the surface of the board. This eliminates the need for holes in the board and thereby allows both sides of the board to be more fully populated with components.
The manufacture of PCBs using SMT is similar to that for components with leads. Small pads of silver or gold plate or tin-lead are placed on the board for attaching the components. Solder paste, a mixture of flux and small balls of solder, is then applied to the
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