Murata lists the BLM15BB470SN1D as Active.
47 Ω at 100 MHz — where the suppression lands
The bead presents 47 Ohms impedance at 100 MHz, which is the typical attenuation peak for suppressing conducted noise in the low-VHF band — think clock harmonics, switching-regulator ripple, or digital bus radiation. The 300 mA continuous current rating and 350 mOhm max DCR set the DC voltage drop and self-heating; at full rated current the bead drops about 105 mV and dissipates roughly 32 mW, well within the 0402 body's thermal budget for most signal-line applications.
0402 footprint, single-line — tight-layout fit
It is a single-line filter, so each bead cleans one signal trace — no shared suppression across multiple nets. The surface-mount termination suits standard reflow profiles; the tape-and-reel packaging is the usual pick-and-place format.
No AEC-Q grade is stated in the record, but the temperature envelope alone does not guarantee automotive qualification — check the full Murata qualification report if the application requires PPAP-level data.