... frequency 3High quality UF & UI Ferrite CoreGeneral Introduction 1, UF ferrite core and UI ferrite core, these Soft ferrite ... 2, In laminated form, features of UF cores and UI cores are similar to that of the "C" core ... about 60% to 80%. 3, UF cores and UI cores possess excellent heat dissipation, and there is lots ... but self-shielding is poor. 4, UF core, UI core and other U cores have two core legs. ...