3.3 µH Shielded Inductor for Automotive and Industrial DC-DC Stages
The Murata LQH2HPZ3R3MDRL is a 3.3 µH shielded wirewound inductor in the LQH2 series, specified for surface-mount assembly in a 1008 (2520 Metric) footprint. Rated for 730 mA continuous current with a saturation current floor of 750 mA, the core saturates only after the rated current is exceeded — a design choice that keeps the inductance stable across the full operating range for a buck converter drawing 600 mA steady-state. The 540 mOhm maximum DCR sets the conduction loss at full load to roughly 0.29 W (I²R) — the self-heating stays within the ferrite core's thermal limits, but the PCB copper plane under the 1008 footprint should have a solid thermal via to the ground layer if ambient exceeds 85°C.
Shielding and Self-Resonant Frequency for EMI Containment
The shielded ferrite construction contains the magnetic flux within the core body, reducing radiated emissions from the inductor into adjacent traces or the enclosure — a requirement for CISPR 25 Class 5 conducted emissions in automotive ECU layouts. Self-resonant frequency is 45 MHz, well above the 2–3 MHz switching frequency typical of automotive buck converters; the inductor behaves as a pure inductive element in that band, with the parasitic capacitance only becoming significant above 20 MHz where the impedance slope flattens.
Procurement and Sourcing for the BOM Line
The base product number LQH2HPZ covers the full inductance range in this series — a BOM change to a different value within the family shares the same 1008 footprint and shielding construction, simplifying qualification for alternate values.