The SESI 15 21K 1WR from Exxelia Technologies is a Space Qualified Inductor with Inductance 21 µH(No Load), Inductance Tolerance ± 20%, DCR 36 mOhms, Saturation Current 2.9 A(Rated), Temperature Operating Range -55 to 125 Degree C. Tags: Surface Mount. More details for SESI 15 21K 1WR can be seen below.