820 µH wirewound in a 1812 footprint
The Murata LQH43MN821K03L is a drum-core, wirewound inductor from the LQH43 series, offering 820 µH inductance with ±10% tolerance in a standard 1812 (4532 Metric) surface-mount package. Rated for 60 mA continuous current with a maximum DC resistance of 20.5 Ohm, this unshielded inductor is suited for filtering and energy storage in low-current DC-DC converter output stages or signal-line chokes where the 820 µH value provides high impedance at switching frequencies.
Frequency response and temperature range
A Q factor of 40 at 796 kHz and a self-resonant frequency of 2.2 MHz define the useful band; above 2.2 MHz the inductor behaves capacitively, so the application should keep the ripple fundamental below that threshold. The operating temperature range spans -40°C to +85°C, covering most indoor industrial and automotive interior environments without derating concerns at the 60 mA rated current. Inductance is tested at 1 kHz, confirming the core material (ferrite) and winding are stable at low frequencies; the 820 µH value holds well within tolerance across the rated temperature band.
Package and board-fit details
The unshielded construction means the magnetic field extends outside the package; keep sensitive traces or low-level analog circuitry at least one package width away to avoid coupling.