The RDR664-3R9M-LF from Coilmaster Electronics is a Power Inductor with Inductance 3.9 µH, Inductance Tolerance ±20 %, DCR 33.4 milli-ohm, Saturation Current 2.63 A, Temperature Operating Range -45 to 125 Degree C. Tags: Through Hole. More details for RDR664-3R9M-LF can be seen below.