3.3 µH shielded wirewound for DC-DC input/output filtering
The Murata LQH32PN3R3NN0L is a 3.3 µH drum-core wirewound inductor in the LQH32 series, built for surface-mount power rail filtering where a shielded construction is needed to contain magnetic flux. Rated for 1.2 A continuous current with a DCR of 144 mOhm max, the DC copper loss at full load is about 207 mW — a figure that factors into the thermal budget of a compact 1210 footprint. The saturation current of 1.25 A defines the point where inductance drops by 30%; staying below this threshold in steady-state avoids unexpected ripple current in a buck converter output stage.
Shielding and frequency response for switching regulators
The shielded ferrite core reduces radiated EMI, which matters when the inductor sits near sensitive analog traces or RF sections on the same board — the self-resonant frequency of 50 MHz keeps the usable inductance flat well above typical 1-2 MHz switching frequencies.