The ERJ-2RKF30R1X is a Panasonic Thick Film Resistor manufactured in a small (SMD) 0402 package, with 30.1 ohm resistance and 1% tolerance. It is a type of electronic component used in electronic circuits to control current flow and regulate voltage levels. It is commonly used in a variety of applications, including signal conditioning, timing and power management, filtering, and motor control. The resistor is constructed with an electrically non-conductive ceramic chip substrate, on which an extremely thin layer of conducting and resistive material (called Thick Film material) is printed and then fired at high temperatures to create the desired resistive value. This provides a robust and miniature solution for many applications.