1.8 kOhm at 100 MHz — the suppression target
The BLM15HD182SH1D: This ferrite bead presents 1.8 kOhm impedance at 100 MHz, which is the standard reference frequency for EMI suppression in signal lines. The high impedance at that band means it effectively attenuates conducted noise from switching regulators, clock harmonics, or RF interference coupling into a DC or low-frequency signal path. The 200 mA continuous current rating and 2.2 Ohm maximum DC resistance define the thermal budget: at full rated current, the I²R loss is 88 mW, which is well within the 0402 package's dissipation capability at 125 °C ambient.
AEC-Q200 qualification — deployment envelope
Rated AEC-Q200, this ferrite bead is qualified for automotive-grade stress testing including thermal shock, moisture resistance, and mechanical shock.
0402 footprint — board-fit note
Housed in the standard 0402 (1005 Metric) surface-mount package, the BLM15HD182SH1D measures 1.00 mm x 0.55 mm with a maximum seated height of 0.55 mm. The single-line filter occupies minimal PCB area and is compatible with standard pick-and-place and reflow processes. Tape-and-reel packaging supports volume assembly.