The BLM15AG221SZ1D: Rated AEC-Q200, this ferrite bead passes the stress tests (thermal shock, moisture resistance, mechanical shock/vibration) the automotive tier-1 requires for a PPAP package. 220 Ω impedance at 100 MHz suppresses conducted emissions on the signal line — clock, data, or CAN bus.
0402 footprint and the sourcing posture
Standard 0402 (1005 Metric) single-line ferrite bead — one pad per end, no thermal pad, no orientation. The same footprint serves the whole BLM15AG family, so swapping impedance values on the same board position requires only a reel change at the pick-and-place.