10 Ω at 100 MHz — what that means on the bench
The BLM15BB100SH1D is a single-line differential-mode ferrite bead from Murata's EMIFIL BLM15 series, presenting 10 Ω impedance at 100 MHz. At that frequency, the bead acts as a lossy resistor, converting high-frequency noise into heat rather than reflecting it back down the trace — a common choice for suppressing switching noise on digital supply rails or data lines where the noise spectrum peaks in the 100 MHz region.
0402 footprint — board-fit reality
The single-line design means one bead per trace — no shared suppression between adjacent nets.