BLM15PX331SN1D

• 330 Ohm Impedance at 100 MHz, 25 Percent Tolerance
• 1.2 A Maximum DC and RMS Current Rating
• 150 Milliohm DC Resistance
• Ferrite core, Multilayer construction, Single Line
• 0402 Case size, 1005 metric, 1 Mm X 0.5 Mm X 0.5 Mm
• -55 C to 125 C Operating Temperature Range
• SMD/SMT termination, Tape and reel, RoHS Compliant and Lead Free

The Murata BLM15PX331SN1D is a multilayer ferrite bead chip rated at 330 ohms impedance with 25 percent tolerance, measured at a 100 MHz test frequency. It carries up to 1.2 A of DC current with a low 150 milliohm DC resistance, in a surface-mount 0402 case (1005 metric) measuring 1 mm x 0.5 mm x 0.5 mm. A ferrite bead is a frequency-dependent impedance: near-zero resistance at DC so it passes supply current with minimal drop, rising to a lossy high impedance at high frequency where it dissipates noise as heat rather than reflecting it. The BLM15PX331SN1D is rated -55 C to 125 C, is RoHS compliant and lead free, and ships on tape and reel.

Ferrite beads in this range are placed in series with power rails to suppress conducted EMI, isolate noisy switching supplies from sensitive analog and RF sections, decouple clock and oscillator supplies, and reduce radiated emissions on cable and connector interfaces during EMC qualification. The 150 milliohm DC resistance keeps the rail voltage drop small at the 1.2 A rating, which is what makes the part usable on real supply lines rather than signal lines only. The 0402 footprint suits dense boards such as handsets, wearables, camera modules, and compact IoT designs. Typical buyers are EMC and board-level hardware designers, consumer and wireless device OEMs, and contract manufacturers sourcing high-volume passives.