Inductance and current limits — what the 1.5 mH rating means for your rail
The Coilcraft LPS5015-155MRC is a shielded drum-core inductor in the LPS5015 series, rated 1.5 mH ±20% with a continuous current of 90 mA and a saturation current of 80 mA at 100 kHz test frequency. The 80 mA saturation floor is the real limit for DC bias — once the core saturates, inductance collapses and the ripple current rises, so the 90 mA thermal rating is usable only when the DC component stays below the saturation knee.
DC resistance and self-resonant frequency — the loss and bandwidth ceilings
Self-resonant frequency is 2.5 MHz — above this point the inductor behaves capacitively, so the part is suited for DC-DC converters and filtering below roughly 500 kHz where the impedance stays inductive. The shielded ferrite core contains the magnetic field within the package, which reduces crosstalk to adjacent traces on a dense PCB — useful when the inductor sits near sensitive analog or RF circuitry.