The ER17S391JKR from Gowanda Electronics is a RF Inductor with Inductance 3.9 uH, DC Resistance 0.4 Ohms, DC Current 450 mA, Self Resonant Frequency 75 MHz, Operating Temperature -55 to 105 Degree C. Tags: Ceramic Inductor, Wire Wound Inductor. More details for ER17S391JKR can be seen below.