BLM15PX121SN1D

BLM15PX121SN1D is a ferrite bead from Murata in a 0402 (1005 metric) case with an impedance of 120 Ω ±25% at 100 MHz, and Murata's PIM record lists this part as In Production. Ratings with their temperature points: 2 A at +85 °C and 1.1 A at +125 °C; DC resistance 0.055 Ω maximum; dimensions 1.0 x 0.5 x 0.5 mm; operating range −55 °C to +125 °C. The final D is the paper-tape reel at 10,000 pieces. The selection point is current: 2 A class in a 0402 bead is the PX line's reason to exist — power-line noise suppression in phones and compact modules where the rail still carries real current. Selection advice: at 0402 the bead's thermal environment is the board itself; apply the +125 °C figure (1.1 A) wherever the enclosure runs hot, not the room-temperature headline.