33 µH, 500 mA — shielded drum core in a 5×5 mm footprint
The Coilcraft LPS5015-333MRC is a 33 µH shielded drum-core inductor rated for 500 mA continuous current with a 750 mOhm maximum DCR. The ferrite core and shield contain the magnetic field, reducing radiated EMI into adjacent traces or components on a densely populated board. Saturation current is specified at 550 mA, meaning the inductance starts to roll off just above the rated current — a 10% margin over the 500 mA continuous rating gives some headroom for transient peaks without a hard collapse. The self-resonant frequency of 24 MHz places the usable inductive region well below that point; for DC-DC converters switching at 500 kHz to 2 MHz, this part stays firmly in the inductive band with negligible capacitive crossover.
Board-fit and thermal envelope
The ±20% tolerance is typical for power-grade ferrite inductors; the actual inductance at 125°C will shift within the tolerance band, so the DC-DC control loop should be compensated for the full range. Inductance is tested at 100 kHz — a standard test frequency for power inductors that correlates well with the operating conditions in buck and boost converters.
Sourcing and authenticity check
The ferrite core material and drum-core construction are consistent across the LPS5015 family; a decap X-ray would show the wire winding on the drum and the shield cap. Counterfeit risk is low for this value range, but the 750 mOhm DCR and 500 mA rating are parametric checks that a quick LCR meter reading at 100 kHz can confirm on receipt.