6.8 µH shielded power inductor for automotive DC-DC
The Murata LQH43PH6R8M26L is a shielded wirewound power inductor in the LQH43 series, built on a ferrite drum core and wound for a nominal 6.8 µH inductance. Rated for 1.4 A continuous current with a saturation floor of 1.2 A, it carries a maximum DC resistance of 117.6 mOhm — a combination that keeps conduction losses manageable in a 4.50 x 3.20 mm footprint. The AEC-Q200 qualification (Grade 3, -40°C to +85°C) means this part is screened for automotive-grade thermal cycling, vibration, and bias humidity — it belongs on a power rail in an ECU, sensor module, or infotainment board where the ambient stays inside the industrial band.
Current rating and saturation margin
The 1.4 A continuous current rating is the thermal limit at 85°C ambient — the wire temperature rise stays within the ferrite core's Curie margin at that load. Saturation current is specified at 1.2 A, about 14% below the continuous rating, which is typical for a shielded drum-core construction where the magnetic path saturates before the winding overheats. For a buck converter switching at 1 MHz (the test frequency), the 6.8 µH value and 1.2 A Isat give enough energy storage to smooth ripple current in a 12 V to 3.3 V rail at moderate loads.
Shielding and self-resonant behaviour
The shield reduces magnetic flux leakage into adjacent traces and components — important when the inductor sits next to a sensitive analog front-end or a wireless transceiver on the same board. Self-resonant frequency is 30 MHz, well above the 1 MHz test frequency, so the inductor behaves as a pure inductive element in typical switching regulator loops below 10 MHz.