1 kOhm suppression at 100 MHz, 0402 footprint
The BLM15HD102SH1D is a single-line ferrite bead from Murata's EMIFIL BLM15 series, offering 1 kOhms impedance at 100 MHz in a 0402 (1005 Metric) surface-mount package. This impedance peak targets conducted noise in the 30–300 MHz range — the band where switching regulators and digital clocks radiate common-mode energy onto signal traces. Rated for 250 mA continuous current with a maximum DC resistance of 1.25 Ohm, the bead's insertion loss at the rated current stays within the signal margin for low-power lines — sensor outputs, I2C buses, or GPIO pull-ups — where the 1.25 Ohm drop at 250 mA (312 mV) does not violate the logic-low threshold.