When a layout is short on height but crowded with RF filters and decoupling, multilayer chip inductors (MLCI) often beat wirewound parts on footprint and magnetic leakage - as long as you accept lower Q and lower inductance ceilings.
An MLCI forms its spiral from stacked conductive paste and ferrite layers sintered into a monolithic chip. There is no discrete wound wire. That structure confuses newcomers who hear "multilayer ceramic" and think capacitor; electrically it still stores magnetic energy for choking, filtering, and compact EMI control.
Inside the package
Conductive paste patterns connect through the stack into a spiral. Ferrite surrounds the path, closing much of the magnetic circuit and reducing flux that would otherwise couple into nearby inductors or magnetically sensitive traces. End electrodes provide SMT pads without through-hole leads.
Construction quality hinges on spiral continuity and ferrite sintering. Interlayer opens, poorly formed vias in laminated constructions, or binder/sinter issues show up as inductance scatter, low Q, or latent reliability fails.
Where MLCI wins and loses
Strengths: small standardized chip sizes, leadless SMT friendliness, mechanical robustness of a sealed body, and lower leakage for dense layouts. Limitations: inductance and Q usually trail wirewound SMT inductors of similar volume; precision resonant tanks and higher-energy storage often need wirewound or larger cores.
Pick MLCI when space, automated assembly, and neighbor isolation dominate. Pick wirewound when Isat, Q, or henries per cubic millimeter dominate. Do not swap families in a BOM solely because the land looks similar.
Selection parameters that belong on the RFQ
Inductance at the operating bias and frequency, Q or Rdc as relevant, SRF relative to the noise band you care about, rated current (Irms and Isat), tolerance, and package height. Automotive or harsh grades need explicit reliability callouts.
Land pattern and reflow profile from the datasheet matter for tombstoning and open joints on small chips. Keep copper balance and keep-out from large magnetics or speakers if the app is sensitive - closed-path helps, it does not make layout irrelevant.
PCBA and sourcing notes
MLCI parts are widely available in communication, automotive electronics, consumer AV, and compact modules. Second-source carefully: same size code does not guarantee same ferrite system or bias curve. For related inductor context see SMD inductor basics.
Include MPN, alternates, and height constraints in the BOM package when you place an order for SMT builds.