15 µH wirewound in 1812 — core parameters
The LQH43MN150J03L is a drum-core wirewound inductor from Murata's LQH43 series, built on a ferrite core and unshielded. It delivers 15 µH ±5% at 1 MHz test frequency, with a current rating of 360 mA. DC resistance is 730 mOhm max — at rated current the I²R loss is about 95 mW, which is within the dissipation of the 1812 body in still air. The self-resonant frequency sits at 19 MHz, so the inductive impedance holds up well into the low-MHz switching range before parasitic capacitance takes over.
Q factor and frequency response
Q is specified at 35 minimum at 1 MHz — a moderate figure typical of ferrite-core wirewounds in this footprint. The 19 MHz SRF means the inductor behaves as a pure inductance up to about 5-8 MHz; above that the effective inductance rolls off and the Q drops. For a buck converter switching at 500 kHz to 2 MHz, this part is comfortably below the SRF knee.
Temperature grade and shelf life
The ferrite core material does not saturate sharply with temperature in this range, but the DCR will drift up about 0.4% per °C. Store the reels in a dry environment below 40°C; the 1812 body is not moisture-sensitive per J-STD-020, but the tape-and-reel packaging should be kept sealed until use to avoid oxidation on the terminations. This is a standard catalogue part in the LQH43 series, so availability through authorized distribution is stable.