4.7 µH, 1 A, Shielded — DC-DC Filtering Fit
The Murata LQH32PB4R7NN0L is a 4.7 µH shielded wirewound inductor in the LQH32 series, built on a ferrite core with a 1210 (3225 metric) footprint. It is rated for 1 A continuous current and saturates at the same 1 A threshold, with a DC resistance of 180 mOhm. The 1 A saturation current and 180 mOhm DCR set the usable DC bias limit — above 1 A the inductance rolls off, and the 180 mOhm contributes 180 mW of I²R loss at full rated current, which the 105°C operating ceiling must absorb.
Self-Resonant Frequency and Tolerance
Self-resonant frequency is 40 MHz, well above typical DC-DC switching frequencies (500 kHz–2 MHz), so the inductor behaves as a pure inductive element in the converter's passband. The ±30% tolerance is standard for power-grade ferrite inductors — the actual inductance at bias may shift, but the saturation rating is the hard limit.