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Pololu 3.3V, 300mA Step-Down Voltage Regulator D24V3F3
The compact (0.4″ × 0.5″) D24V3F3 switching step-down (or buck) voltage regulator takes an input voltage between 4.3 V and 42 V and efficiently reduces it to 3.3 V while allowing for a maximum output current of 300 mA. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.
Alternatives available with variations in these parameter(s): output voltage maximum output current
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This DXF drawing shows the locations of all of the board’s holes.