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Surface-mount technology facts for kids

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SMD capacitors and two through-hole capacitors (with long leads).
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SMD resistors next to a match head

Surface-mount technology (SMT) uses electronic devices that are made to be placed directly onto the surface of printed circuit boards (PCBs).

Examples of surface-mount devices are resistors, capacitors, LEDs and integrated circuits. Surface mounted devices are generally smaller than those used in the older through-hole technology, which need longer leads and holes in the circuit board.

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Surface-mount technology Facts for Kids. Kiddle Encyclopedia.