220 µH ferrite-core inductor for automotive-grade filtering
The LQH32NH221J23L is a drum-core wirewound inductor from Murata's LQH32 series, delivering 220 µH inductance with ±5% tolerance in a 1210 (3225 metric) surface-mount package. Rated for 60 mA DC with a maximum DC resistance of 10.14 Ohm, this part is sized for low-current filtering and decoupling in power rails where inductance stability over temperature matters.
Self-resonant frequency and Q factor — what they mean for your filter
The self-resonant frequency is 5.5 MHz — above this point the inductor behaves capacitively, so the useful filtering band stops well below that ceiling. For a buck converter switching at 1–2 MHz, the 220 µH value still holds its impedance. A Q factor of 40 at 1 MHz (the test frequency) indicates moderate energy storage efficiency at that spot — the inductor's AC losses are low enough for LC tank circuits or resonant converters tuned near 1 MHz.