BLM31KN121BH1L

Chip Ferrite Bead Overview

The Murata BLM31KN121BH1L is a single-line ferrite chip bead designed for surface mount applications in the 1206 (3216 metric) package. It provides an impedance of 120 Ohms at 100 MHz with a maximum DC resistance of 9 mOhms. The component supports a rated current of 4A and operates within a temperature range of -55°C to +150°C. It is qualified to AEC-Q200 standards for automotive reliability.

Chip Ferrite Bead Feature Summary

• Designed to function nearly as a resistor at noise frequencies, reducing resonance possibilities and leaving signal waveforms undistorted
• Automotive-grade construction compliant with AEC-Q200 standards
• Multi-layer power filter technology suitable for high-current applications

Chip Ferrite Bead Applications

• Automotive electronic circuit noise suppression
• Power line filtering in vehicle systems
• EMI suppression in automotive sensors and modules

Chip Ferrite Bead Procurement Notes

Verify the specific suffix BH1L against official Murata documentation to confirm the exact impedance tolerance and packaging configuration. Ensure the procurement source provides valid traceability for AEC-Q200 automotive qualification requirements. Cross-reference the manufacturer part number directly with the datasheet to avoid substitution errors.

Chip Ferrite Bead Selection Notes

Select this component when a 1206 footprint is required for high-current power line filtering in automotive environments. The 4A rating and low DC resistance make it suitable for power distribution networks where minimal voltage drop is critical. Verify that the 120 Ohm impedance at 100 MHz aligns with the target noise frequency spectrum.

Chip Ferrite Bead Part Context

This component belongs to the Murata BLM series of ferrite beads, specifically engineered for EMI suppression. The BLM31KN variant indicates a multi-layer power type optimized for automotive durability. It serves as a passive filter element to attenuate high-frequency noise on DC power lines without distorting the primary signal.

Chip Ferrite Bead Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.