The MCR18ERTJ821 is a ceramic chip fixed capacitor made by the Japanese company ROHM. It has an 18 VDC rating and a capacitance of 0.22µF. It is a multilayer, monolithic chip type, connected in an X7R dielectric with a lead pitch of 2.5 mm. This capacitor is temperature stable and has good radiation resistance, making it suitable for high frequency applications such as radio, microwave, and telecommunication equipment.