75 Ω at 100 MHz — the suppression target
The BLM15BD750SN1D is a single-line ferrite bead from Murata's EMIFIL® BLM15 series, in the standard 0402 (1005 metric) footprint. Its 75 Ω impedance at 100 MHz is the figure that governs noise attenuation at that frequency — the bead presents a resistive loss to common-mode or conducted EMI components near 100 MHz, converting them to heat rather than reflecting them back into the circuit.
300 mA and 200 mΩ DCR — the signal-path budget
Rated for a maximum continuous current of 300 mA, with a DC resistance of 200 mΩ maximum. The DCR also sets the self-heating: at 300 mA the I²R loss is 18 mW, well within the 0402 body's dissipation capability at 85 °C ambient.
The ferrite material's impedance curve shifts with temperature — the 75 Ω figure at 100 MHz is specified at room temperature; expect the peak impedance frequency to drift slightly across the full range, but the bead remains effective as a broadband suppressor.