Impedance and current handling
The BLM15AG221SN1D: This single-line ferrite bead presents 220 Ohms of impedance at 100 MHz, the standard suppression frequency for conducted EMI on signal and low-power supply lines. The 450 mA current rating sets the continuous load it can carry without saturating the ferrite material — stay below this for the impedance curve to hold.
Temperature grade and package
The 0402 (1005 metric) footprint is standard for high-density PCB layouts — the 0.55 mm seated height fits under low-profile shielding cans or between closely stacked boards.