Active production, 120 Ohm suppression at 100 MHz
The BLM15HB121SN1D is an active-production ferrite bead from Murata's EMIFIL® BLM15 series, rated for 120 Ohms impedance at 100 MHz. This is the suppression point where common-mode noise on a signal line sees its highest attenuation — useful for cleaning up a 100 MHz clock or data line where the third harmonic falls in that band. Current rating is 300 mA max, with a DCR of 700 mOhm max. At full rated current the DC drop is 210 mV — budget that into the rail voltage if the bead sits on a power supply line.
0402 footprint, -55 to 125°C range
The surface-mount footprint matches the common 0402 land pattern — no special pad geometry needed. The impedance curve shifts with temperature — expect the 120 Ohm peak to drop roughly 20 % at 125°C, which is typical for NiZn ferrite material.