BLM21SN300SN1D

Chip Ferrite Bead Overview

The Murata BLM21SN300SN1D is a single-line ferrite bead chip designed for power line noise suppression. It operates within the EMIFIL BLM21 series and utilizes an 0805 (2012 metric) surface-mount package measuring 2.00mm x 1.25mm with a maximum height of 1.05mm. The component provides an impedance of 30 Ohms at 100 MHz while supporting a maximum rated current of 8.5A. Its maximum DC resistance is specified at 4 milliohms, ensuring minimal voltage drop in high-current applications. It functions effectively across a temperature range of -55°C to 125°C.

Chip Ferrite Bead Feature Summary

• Engineered for high-current power line filtering applications
• Provides effective electromagnetic interference suppression at 100 MHz
• Features low DC resistance to minimize signal loss in power paths

Chip Ferrite Bead Applications

• Power supply input filtering
• EMI suppression on high-current data lines
• Noise reduction in portable electronic devices

Chip Ferrite Bead Procurement Notes

Verify the complete part number including suffixes against official Murata documentation to ensure correct impedance and current ratings. Confirm RoHS3 compliance status and moisture sensitivity level requirements prior to procurement. Cross-reference manufacturer datasheets for specific handling and reflow soldering profiles to maintain component integrity during assembly processes.

Chip Ferrite Bead Selection Notes

Select this component when designing circuits requiring significant current handling capacity alongside noise attenuation. The 8.5A rating distinguishes it from standard signal-line ferrites. Ensure the PCB footprint matches the 0805 dimensions and verify that the thermal management capabilities accommodate the operating temperature range without derating the current performance below system requirements.

Chip Ferrite Bead Part Context

This component belongs to the Murata EMIFIL BLM21SN series, which specializes in high-current ferrite beads. Unlike lower-current variants in the broader BLM21 family, the SN sub-series is optimized for power distribution networks. It serves as a critical passive element for maintaining signal integrity in noisy electrical environments while managing substantial direct current loads.

Chip Ferrite Bead Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.