180 µH wirewound inductor for automotive and industrial DC-DC filtering
The Murata LQH43NH181J03L is a drum core, wirewound inductor in the LQH43 series, rated 180 µH ±5% at 1 MHz test frequency. It carries a continuous current rating of 110 mA with a maximum DC resistance of 4.08 Ohm — the I²R loss at full rated current is about 49 mW, well within the 125°C operating ceiling.
Parametric fit for power-line and signal filtering
The 180 µH inductance at 110 mA gives a stored energy of 1.1 µJ — enough to smooth ripple in a low-current DC-DC converter output or filter EMI on a sensor supply rail. The unshielded construction means the magnetic field extends beyond the core; keep sensitive traces or other magnetics at least one part-width away to avoid coupling. Self-resonant frequency is 5 MHz — above this point the inductor behaves as a capacitor. For a buck converter switching at 500 kHz, the 180 µH value provides good attenuation of the switching fundamental and its second harmonic before the SRF rolls off the impedance. Q factor of 40 at 796 kHz indicates moderate AC losses at that frequency — useful for resonant tank circuits or filter stages where the Q sets the bandwidth. The ferrite core material is optimised for the 1 MHz test frequency and the 5 MHz SRF window.
The surface-mount package is compatible with standard pick-and-place equipment and reflow soldering profiles. The tape-and-reel packaging (Cut Tape also available) suits both prototyping and production volumes. The unshielded drum core design means the inductor's magnetic field is not contained by a ferrite shield — adjacent traces carrying high-speed signals or other inductors should be spaced at least 5 mm away to avoid parasitic coupling that shifts the effective inductance.
AEC-Q200 qualification is the key compliance signal for automotive BOMs — it satisfies the PPAP documentation requirement for Tier-1 and OEM production.