Voltage Regulator (3.3v)
The LD1117V33 is a prerrty common and a well known 3.3v voltage regulator. It is a low drop out voltage regulator (LDO) which is cabable of delivery up to 800mA of output current. A 10uF capacitor is enough to maintain stability (available on the related items tab).
Note from Zero Ohm customer Omar Lim: "NOTE: This does not have the typical voltage regulator pin config. Recheck your design. *** THIS IS NOT IN-GND-OUT ***. Because of my hubris, I fried two of these."