82 µH inductor for filtering and bias applications
The Murata LQH31MN820J03L is a drum core wirewound inductor in the LQH31 series, offering 82 µH inductance with ±5% tolerance in a standard 1206 (3216 Metric) surface-mount footprint. Rated for 45 mA DC current, this part suits low-power filtering, decoupling, and bias circuits where the DC resistance of 11 Ohm is acceptable relative to the load current.
Self-resonant frequency and operating temperature
With a self-resonant frequency of 7.5 MHz, the inductor maintains its inductive impedance up to that point; above it, parasitic capacitance dominates and the part behaves capacitively. The ferrite core and unshielded construction keep the part cost-effective, but the lack of magnetic shielding means adjacent traces or components may pick up stray flux — board layout should account for this.