The SDH5040-3R9M-LF from Coilmaster Electronics is a Power Inductor with Inductance 3.9 µH, Inductance Tolerance ±20 %, DCR 6.0 milli-ohm, Saturation Current 26.8 A, SRF 40 MHz. Tags: Surface Mount. More details for SDH5040-3R9M-LF can be seen below.