The MS2520LS-3R9J-LF from Coilmaster Electronics is a Power Inductor with Inductance 3.9 µH, Inductance Tolerance ±5 %, DCR 1660.0 milli-ohm, Saturation Current 0.7 A, SRF 144 MHz. Tags: Surface Mount. More details for MS2520LS-3R9J-LF can be seen below.