The CSDB1004M3R8T from Cal-Chip Electronics is a Power Inductor with Inductance 3.8 µH, Inductance Tolerance ±20 %, DCR 17.0 Mega-ohm, Saturation Current 6.00 A, Temperature Operating Range -40 to 85 Degree C. Tags: Surface Mount. More details for CSDB1004M3R8T can be seen below.