6.8 µH shielded inductor with AEC-Q200 grade
The Coilcraft LPS4018-682MRC is a 6.8 µH shielded drum-core power inductor in the LPS4018 series, rated for 1 A continuous current with a saturation current of 1.2 A. The ±20% tolerance covers the full operating range including DC bias effects — a common tolerance for power inductors where the core permeability shifts with current. AEC-Q200 qualification means this inductor passed the automotive-grade stress tests: thermal shock, humidity bias, mechanical shock, and vibration per the passive-component qualification standard.
DC resistance and self-resonant frequency
Maximum DCR is 150 mOhm — at 1 A the I²R loss is 150 mW, which the 1.8 mm seated height package dissipates into the PCB copper plane. The self-resonant frequency of 50 MHz is well above the switching frequencies of typical buck converters (500 kHz to 2 MHz), so the inductor behaves as a pure inductance in the passband. Shielded construction (ferrite core with magnetic shield) reduces radiated EMI into adjacent traces and components — useful when the inductor sits near a sensitive analog front-end or RF section on the same board.