The MCR18EZHJ243 part is an ultra-small, yet high power, SMD Schottky Barrier Diodes manufactured by ROHM. It has a maximum forward current of 200 mA, reverse voltage of 18 V, and capacitance of 1.6 pF. It is ideal for low voltage, high current applications such as DC/DC converters, and it comes with a small JEDEC SOD-523 package size.