68 µH drum core wirewound — what the ratings mean for your power rail
The Murata LQH43MN680J03L is a 68 µH drum core wirewound inductor in the LQH43 series, built on a ferrite core and housed in an 1812 (4532 Metric) surface-mount package. Rated at 180 mA DC with a maximum DCR of 1.9 Ohm, this part suits low-current filtering and decoupling roles where the DC bias stays well under 200 mA — think supply rail ripple suppression or LC filter output stages drawing tens of milliamps. The 1.9 Ohm DCR means a 180 mA load drops roughly 340 mV across the winding and dissipates about 62 mW in copper loss — fine for most board-level filters, but worth checking against your thermal budget if the inductor sits near a hot regulator or in a confined enclosure.
Unshielded construction and self-resonant frequency — layout gotchas
This is an unshielded drum core design — the magnetic field extends beyond the package, so keep sensitive traces or adjacent inductors a few millimeters away to avoid coupling. The self-resonant frequency is 8.4 MHz, meaning the inductor behaves inductively well below that; above 8.4 MHz the impedance turns capacitive, so it is not a good choice for switching converters running above a couple of megahertz. The Q factor is 35 at 1 MHz — moderate for a wirewound of this size. For narrowband filtering near 1 MHz the insertion loss is acceptable, but for higher-Q tank circuits you would look at air-core or ferrite-tuned alternatives.
Active production — sourcing posture for this BOM line
No stock-holding claim — quoted per RFQ.