BLM21BD421SH1D

Chip Ferrite Bead Overview

The Murata BLM21BD421SH1D is a single-line ferrite bead in the EMIFIL BLM21 series, housed in an 0805 (2012 metric) surface-mount package. It provides an impedance of 420 Ohms at 100 MHz with a maximum DC resistance of 300 milliohms and a rated current of 300 mA. The component operates within a temperature range of -55°C to +125°C and measures 2.00mm x 1.25mm x 1.45mm.

Chip Ferrite Bead Feature Summary

• Designed to function as a resistor at noise frequencies to minimize resonance risks
• Maintains signal waveform integrity during high-frequency noise suppression
• Supports surface-mount installation for automated assembly processes

Chip Ferrite Bead Applications

• Signal line noise filtering
• EMI suppression circuits
• Audio line noise filtering

Chip Ferrite Bead Procurement Notes

Verify the complete part number including suffixes such as SH1D or SN1D, as these indicate specific packaging configurations like tape and reel or cut tape. Confirm RoHS compliance status and moisture sensitivity level requirements against project specifications before finalizing orders.

Chip Ferrite Bead Selection Notes

Select this component when a 0805 footprint is required for single-line applications needing 420 Ohms impedance at 100 MHz. Ensure the circuit current does not exceed the 300 mA rating to prevent performance degradation. Verify thermal management capabilities within the specified -55°C to +125°C operating range.

Chip Ferrite Bead Part Context

This part belongs to the Murata EMIFIL BLM21 series of chip ferrite beads. The series is engineered for effective electromagnetic interference suppression in compact electronic designs. The BLM21BD variant specifically targets signal lines requiring moderate current handling in small form factors.

Chip Ferrite Bead Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult official Murata resources for cross-reference data.