TDK's SPM-HZ series inductors are wirewound with a metal core and are designed for use in automotive power circuit applications such as car navigation and audio, electronic power steering, and headlights, among others. These inductors are magnetically shielded, and the structure has an integrated molded coil, so hum noise is lower than with ferrite core adhesive coils. Compared with ferrite wound inductors, SPM-HZ series inductors feature large current, low R_DC, and small size. SPM-HZ inductors also feature low inductance variance in high-temperature environments with good DC superimposition characteristics.