120 µH, 200 mA — what the ratings mean for your power rail
The LQH32PN121MN0L is a shielded drum-core wirewound inductor from Murata's LQH32 series, rated 120 µH ±20% at 1 MHz test frequency. The 200 mA continuous current rating is the DC bias current at which the inductance typically drops by 10% — stay below this to keep the filtering or energy-storage characteristic within tolerance. Maximum DC resistance is 5.26 Ohm, which at 200 mA produces about 0.21 W of I²R loss — within the package's thermal budget for most PCB layouts, but worth checking against the ambient temperature derating if the inductor sits near other heat sources. Self-resonant frequency is 8 MHz; above that the component behaves capacitively, so the usable filtering range is below roughly 2–3 MHz for a typical buck converter or EMI filter application.
Shielded construction and 1210 footprint
Shielded ferrite core construction contains the magnetic field, reducing radiated EMI to adjacent traces and components — important when the inductor shares a dense board with sensitive analog or RF circuitry. Operating temperature range is -40°C to 85°C, covering most indoor and industrial ambient conditions but not extended automotive or under-hood environments.