The ER18M431JR from Gowanda Electronics is a RF Inductor with Inductance 4.3 uH, DC Resistance 0.21 Ohms, DC Current 745 mA, Self Resonant Frequency 60 MHz, Operating Temperature -55 to 105 Degree C. Tags: Ceramic Inductor, Wire Wound Inductor. More details for ER18M431JR can be seen below.