8.2 µH wirewound in a 1206 body
The Murata LQH31MN8R2K03L is a drum-core wirewound inductor in the LQH31 series, rated 8.2 µH ±10% at 1 MHz test frequency. It carries a continuous current rating of 105 mA with a maximum DC resistance of 2.86 Ohm — the DCR sets the I²R heating floor, so at full rated current the self-heating is about 31 mW, negligible in most circuits. The unshielded construction means the magnetic field extends beyond the part body — keep sensitive traces or other magnetics at least a part-width away to avoid coupling.
Frequency limits and Q factor
Self-resonant frequency is 23 MHz; above that the inductor behaves capacitively and the effective inductance drops. The Q factor is 35 at 8 MHz — this is the ratio of stored energy to loss per cycle, so at frequencies near 8 MHz the component acts as a reasonably efficient filter element. Below 1 MHz the Q falls off; above 10 MHz the self-resonance starts to dominate.
Footprint and rework
The solder pads are large enough for hand-soldering or hot-air rework — the ferrite body handles the thermal shock of a preheat to 150°C without cracking, and the nickel barrier terminations wet well with leaded or lead-free solder. No polarity marking needed; orientation is irrelevant for a wirewound inductor.