22 µH, 330 mA — the parametric triangle for filter and DC-DC duty
The LBC3225T220KR is a 22 µH wirewound inductor in Taiyo Yuden's LB, C Type series, rated for 330 mA continuous current with a 270 mOhm DC resistance. That DCR at 330 mA produces a self-heating of I²R ≈ 29 mW — negligible for most boards, but in a high-ambient 105°C corner the temperature rise adds to the thermal budget, so the derating curve matters if the inductor sits near a hot regulator. The 17 MHz self-resonant frequency means the inductor behaves inductively up to roughly 1/10th of SRF — about 1.7 MHz — before parasitic capacitance dominates. For a buck converter switching at 500 kHz to 1 MHz, this part stays in the inductive zone with margin; above 2 MHz the effective inductance drops and the Q collapses.
1210 footprint and unshielded construction — board-fit and EMI trade-offs
The unshielded construction means the magnetic field fringes into the surrounding board area; keep sensitive traces or other magnetics at least one body width away to avoid crosstalk. Surface-mount tape-and-reel packaging supports standard pick-and-place.
NRND — design-in gate for new projects
That means the part is still available for existing BOMs but the manufacturer intends to phase it out — new designs should target a pin-to-pin compatible replacement before the end-of-life notice arrives.