22 µH wirewound inductor for DC-DC filtering and bias decoupling
The Murata LQH32CH220K23L is a 22 µH drum core wirewound inductor in the LQH32 series, built on a ferrite core and rated for 250 mA continuous DC current. The 710 mΩ DC resistance sets the I²R loss budget — at full rated current the self-heating is roughly 44 mW, which is manageable in most 1210 footprint layouts but should be factored into the thermal design if the inductor sits near temperature-sensitive components. The unshielded construction means the magnetic field extends beyond the component body. In a dense PCB layout, keep sensitive traces or other magnetics at least one component width away to avoid coupling. The 19 MHz self-resonant frequency (SRF) means the inductor behaves inductively up to roughly 19 MHz — above that the parasitic capacitance dominates and the impedance rolls off. For a typical buck converter switching at 500 kHz to 2 MHz, this part provides clean filtering with margin.
The ferrite core and wirewound construction give it a low profile that fits under low-clearance components or shielding cans. Tape-and-reel packaging suits automated pick-and-place assembly; the ±10% tolerance is standard for power filtering where the exact inductance value is not critical for loop stability.