750 nH wirewound for RF and power filtering
The Murata LQH31HNR75K03L is a 750 nH drum core wirewound inductor in the LQH31 series, built on a ferrite core and housed in a standard 1206 (3216 Metric) surface-mount package. Its unshielded construction means magnetic flux radiates into the surrounding board area — keep sensitive traces or high-impedance nodes at least one package width away to avoid coupling. Rated for 190 mA DC current with a maximum DC resistance of 1.027 Ohm, this part is sized for signal-path filtering, bias-tee networks, or low-current DC-DC converter output ripple suppression where the I²R loss stays under 37 mW at full rated current.
RF performance and frequency ceiling
With a self-resonant frequency of 220 MHz and a Q factor of 60 at 100 MHz, the LQH31HNR75K03L maintains inductive behaviour well into the VHF band. Above 220 MHz the impedance turns capacitive, so verify the operating frequency stays below SRF with margin — typically 80% of SRF is a safe ceiling for filter designs. The inductance is tested at 1 MHz, but the ferrite core material supports consistent inductance up to several tens of MHz before permeability roll-off begins. For narrowband RF matching at 100 MHz, the Q of 60 gives a 3-dB bandwidth of roughly 1.7 MHz — adequate for most communications IF stages.
Last Buy — procurement window is closing
Murata has classified the LQH31HNR75K03L as Last Buy, meaning the manufacturer is winding down production. No alternate packaging variant is confirmed in the current lifecycle data.
For engine-bay or under-hood applications, look to Murata's AEC-Q200-graded LQH31 series variants instead. The ferrite core material maintains stable inductance across the full temperature range, though the DCR will increase by roughly 0.4% per °C above 25°C due to the copper winding's positive temperature coefficient. At 85°C ambient, expect DCR to rise approximately 24% from the 25°C value.