82 µH at 70 mA — the DC bias tradeoff
The LQH32MN820J23L is a drum-core wirewound inductor from Murata's LQH32 series, rated 82 µH at 70 mA with a ±5% tolerance. The 6.2 Ohm max DCR sets the DC conduction loss — at 70 mA the I²R drop is about 30 mW, negligible in a signal path but a factor if this inductor sits in a DC bias feed for an RF amplifier or a low-power LC filter. The unshielded construction means the flux field extends beyond the core — keep sensitive traces or adjacent inductors at least one part-width away to avoid coupling. The ferrite core material and 8.5 MHz self-resonant frequency make this part usable up to a few MHz before the impedance becomes capacitive.
Q factor and frequency ceiling
Q is specified at 40 at 1 MHz — a moderate figure for a wirewound of this inductance. The self-resonant frequency of 8.5 MHz means the effective inductance starts rolling off well before that; for a clean LC tank or a low-pass filter, keep the operating frequency below about 2 MHz to stay in the inductive region.