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SURFACE MOUNT DEVICE

An electronic system for which the modules are fixed or put directly onto the PCB surface in a power supply is a surface-mount device or SMD power supply/converter. There are Surface Mount Regulators in a number of packages including SOT-89, SOT-223, SOT-23 and TO252-3. 

SMD DC-DC converters can be produced in SOIC-8 with packages available as small as QFN. Linear SMD regulators can have as little as 3 pins but generally have 4 to 6 pins.

As extra inputs or outputs, the additional pins are sometimes used to allow a higher current to operate alongside the SOT-223 which has considerable output.
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