33 µH drum core for DC-DC filtering and signal conditioning
The Murata LQH43CN330K03L is a 33 µH unshielded wirewound inductor in the LQH43 series, built on a ferrite core. It is rated for 310 mA continuous current with a maximum DC resistance of 1 Ω, making it a fit for power rail filtering, DC-DC converter output chokes, and signal-line noise suppression where moderate inductance and current are needed. The self-resonant frequency of 12 MHz sets the usable band — above that the inductor behaves capacitively, so keep switching frequencies well below 12 MHz to maintain inductive impedance. The 1 Ω DCR at 310 mA means about 96 mW of copper loss at full rated current, which is manageable in a 1812 footprint but worth factoring into thermal budget for dense boards.
1812 footprint and surface-mount assembly
The unshielded construction means magnetic flux couples into nearby traces — keep sensitive analog or RF routing at least one part width away, or shield the inductor with a ground plane on the layer below. Supplied on tape and reel (cut tape available), compatible with standard pick-and-place. The ferrite core material is not moisture-sensitive per typical MSL 1, so no dry-bake is required before reflow — store the reels in ambient conditions and they are ready for the line.