3.3 µH wirewound inductor with automotive-grade qualification
The Murata LQH32NH3R3J23L is a 3.3 µH drum core wirewound inductor in the LQH32 series, built on a ferrite core and rated for 425 mA continuous current with a maximum DC resistance of 240 mOhm. The unshielded construction means the external magnetic field is not contained by a magnetic shield; board layout should keep sensitive traces or other magnetics at a distance to avoid coupling, particularly in power supply input or DC-DC converter output stages where the inductor carries ripple current.
Parametric fit for the BOM line
The 3.3 µH inductance value at 1 MHz test frequency with ±5% tolerance is the primary selection parameter — confirm the target inductance at the circuit's operating frequency, as the ferrite core's permeability rolls off above the self-resonant frequency of 65 MHz. The 425 mA current rating is the DC bias current at which the inductance typically drops by 10% (saturation current); the actual ripple current in the application should stay below this to maintain the inductance value and avoid thermal runaway from the 240 mOhm DCR. A Q factor of 20 at 1 MHz indicates moderate AC losses at that frequency; in a resonant tank or filter circuit, the Q sets the bandwidth and insertion loss — a higher Q inductor would be preferred for narrowband RF applications, but this value is typical for a general-purpose power inductor.
Tape-and-reel packaging (Cut Tape also available) is standard for automated pick-and-place assembly; the base product number LQH32NH covers the full inductance range in this construction.