4.7 µH shielded wirewound for DC-DC filtering
The Murata LQH2HPN4R7MDRL is a 4.7 µH shielded wirewound inductor in the LQH2 series, built on a ferrite core with a drum-core construction. It is rated for 650 mA continuous current with a saturation current (Isat) matching the rated current at 650 mA, meaning the inductance holds its value up to the full current rating before rolling off.
Self-resonant frequency and switching noise
The self-resonant frequency (SRF) is 40 MHz. Above this frequency the inductor behaves capacitively, so it is effective as a power-supply filter or DC-DC converter output choke for switching frequencies up to a few MHz — well within the SRF margin for typical buck converters operating at 1-2 MHz. Shielding contains the magnetic field within the component body, which reduces radiated EMI coupling to nearby traces or sensitive analog circuits on the same board layer.
Sourcing and lifecycle posture
For a single-source BOM line, qualifying an alternate from the same LQH2 series with matching inductance and current rating at RFQ time is a hedge worth considering.