10 µH shielded drum core — AEC-Q200 qualified
The Coilcraft LPS4018-103MRC is a 10 µH shielded drum-core power inductor in the LPS4018 series, qualified to AEC-Q200 for automotive-grade reliability. Rated for 900 mA continuous current with a saturation current floor of 1.1 A — the margin above the rated current means the inductance holds up under transient loads without collapsing into the resistive regime. Maximum DC resistance is 200 mOhm, which sets the copper-loss budget for the supply rail.
AEC-Q200 and 125 °C operating ceiling
AEC-Q200 qualification certifies the inductor for automotive stress profiles — temperature cycling, mechanical shock, and bias humidity at Grade 1 levels. The ferrite core and shielded construction contain the magnetic flux, reducing radiated EMI into nearby sensitive traces — a common requirement in automotive ECU layouts and compact DC-DC converter modules.
Self-resonant frequency and test conditions
Self-resonant frequency is 40 MHz — well above typical switching frequencies for point-of-load converters (2-5 MHz), so the inductor behaves as a pure inductive element in the passband. Inductance is measured at 100 kHz, the standard test frequency for power inductors in this value range. Tolerance is ±20%, which is typical for shielded power inductors — the saturation current floor is the tighter constraint for design margin, not the inductance tolerance itself.