The ESI 7 3K7 1S from Exxelia Technologies is a Space Qualified Inductor with Inductance 3.74 µH(No Load), Inductance Tolerance ± 20%, DCR 64 mOhms, Saturation Current 1 A(Rated), Temperature Operating Range -55 to 125 Degree C. Tags: Surface Mount. More details for ESI 7 3K7 1S can be seen below.