BLM21BD421SZ1D

Chip Ferrite Bead Overview

The Murata BLM21BD421SZ1D is a single-line chip ferrite bead in an 0805 (2012 metric) surface-mount package. It provides 420 Ohms impedance 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 meets AEC-Q200 automotive qualification standards.

Chip Ferrite Bead Feature Summary

• Designed to function as a resistor at noise frequencies, reducing resonance risks while preserving signal waveform integrity.
• Automotive-grade reliability certified under the AEC-Q200 standard for robust performance in demanding environments.

Chip Ferrite Bead Applications

• Noise suppression in automotive electronic circuits
• Signal line filtering in high-frequency applications
• Power supply noise attenuation in compact modules

Chip Ferrite Bead Procurement Notes

Verify the specific suffix 'SZ1D' against official Murata documentation to confirm exact impedance tolerance and packaging configuration. Ensure compatibility with existing footprint designs and thermal management requirements before finalizing procurement decisions.

Chip Ferrite Bead Selection Notes

Select this component when a 420 Ohm impedance at 100 MHz is required for a single signal line. The 300 mA current rating and low DC resistance make it suitable for sensitive signal paths where minimal voltage drop is critical. Confirm AEC-Q200 compliance is necessary for the target application.

Chip Ferrite Bead Part Context

This part belongs to the Murata EMIFIL BLM21 series, which offers various impedance values in the 0805 package. The BLM21BD421SN1D variant shares identical electrical specifications but differs in packaging format, such as tape and reel versus cut tape options.

Chip Ferrite Bead Replacement Considerations

The BLM21BD421SN1D is a verified substitute with matching electrical parameters. Verify that the alternative packaging does not impact assembly processes or inventory handling requirements.