The SDC4D18-121N-LF from Coilmaster Electronics is a Power Inductor with Inductance 120 µH, Inductance Tolerance ±20 %, DCR 2390 milli-ohm, Saturation Current 0.18 A, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for SDC4D18-121N-LF can be seen below.