Active production, 2.2 µH wirewound for 1210 pads
The Murata LQH32CN2R2M33L is an active-production drum core wirewound inductor in the LQH32 series, housed in a 1210 (3225 Metric) surface-mount package. Rated at 2.2 µH with a ±20% tolerance, 790 mA current rating, and a maximum DC resistance of 126.1 mOhm, this part is sized for power supply filtering and decoupling in consumer and industrial applications.
Self-resonant frequency and ferrite core
The self-resonant frequency of 64 MHz defines the upper frequency limit where the inductor's impedance peaks before it becomes capacitive — above this frequency the part stops behaving as an inductor and will not filter as expected. The ferrite core material gives high inductance density in the 1210 footprint but saturates at lower DC bias than an air-core or iron-powder alternative — the 790 mA rating is the point where inductance typically drops 10% from the nominal value.
Unshielded construction and board layout
The unshielded drum core design means magnetic flux radiates from the open side — adjacent traces carrying sensitive analog signals or high-impedance nodes should maintain a keep-out zone of at least one part width (3.2 mm) to avoid stray coupling.