The ER18M300JR from Gowanda Electronics is a RF Inductor with Inductance 0.3 uH, DC Resistance 0.065 Ohms, DC Current 2000 mA, Self Resonant Frequency 350 MHz, Operating Temperature -55 to 125 Degree C. Tags: Ceramic Inductor, Wire Wound Inductor. More details for ER18M300JR can be seen below.