The SESI 18 56K 1WR from Exxelia Technologies is a Space Qualified Inductor with Inductance 56 µH(No Load), Inductance Tolerance ± 10%, DCR 48 mOhms, Saturation Current 3.3 A(Rated), Temperature Operating Range -55 to 125 Degree C. Tags: Surface Mount. More details for SESI 18 56K 1WR can be seen below.