12 µH shielded drum core — DC resistance and saturation ceiling
The LPS5015-123MRC is a 12 µH ±20% shielded drum-core inductor from Coilcraft's LPS5015 series, built for surface-mount power filtering in tight board stacks. Its 750 mA continuous current rating and 350 mOhm max DCR define the DC loss budget for the rail — at full rated current the copper loss is roughly 0.2 W, which the 5×5 mm package must dissipate into the board copper. Saturation current is 1 A, the hard ceiling where inductance drops by the test-defined amount — stay below this to keep the ripple current under control in a buck converter.
Shielding and temperature range for dense boards
The shielded construction contains the magnetic field within the ferrite core, reducing EMI coupling to adjacent traces and components — useful when the inductor sits near a sensitive analog rail or RF section. Self-resonant frequency is 40 MHz, well above typical 100 kHz to 2 MHz switching converters — the inductor behaves as a pure inductance in that band, with parasitic capacitance only becoming relevant above 10 MHz.
Footprint and rework considerations
No exposed pad or orientation marking beyond the standard drum-core asymmetry — verify the pad layout against the Coilcraft drawing before stencil release; the part is symmetrical in the X-Y plane, so reverse mounting is electrically identical but visually ambiguous for inspection.