2.7 µH drum core for DC-DC filtering
The Murata LQH43MN2R7M03L is a wirewound drum core inductor in the LQH43 series, built on a ferrite core and unshielded. It delivers 2.7 µH ±20% inductance with a 500 mA current rating and a 320 mOhm maximum DCR — numbers that matter when you're sizing the output filter for a buck converter or a low-current rail. The unshielded construction means magnetic flux radiates — keep it away from sensitive analog traces or place it with a ground plane underneath to contain the field.
Self-resonant frequency and Q factor
The self-resonant frequency is 53 MHz, so the inductor behaves as an inductor well into the HF band. Above that frequency the parasitic capacitance between windings dominates and the impedance turns capacitive — factor this into the switching node of a 1-10 MHz DC-DC converter. The Q peak is usually around the self-resonant frequency; if your filter requires a sharp notch, the Q at the operating frequency sets the insertion loss.
Temperature range and rework handling
The ferrite core material's permeability drifts with temperature; expect inductance to drop by roughly 10-20% at the upper end, which the ±20% tolerance already absorbs.
Sourced through independent distribution channels. No pin-compatible second-source is recorded; the LQH43 series footprint is proprietary to Murata's ferrite core geometry.