The CSDS4D18N121T from Cal-Chip Electronics is a Power Inductor with Inductance 120 µH, Inductance Tolerance ±30 %, DCR 2.390 ohm, Saturation Current 0.18 A, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for CSDS4D18N121T can be seen below.