BLM21BD421SN1D

Chip Ferrite Bead Overview

The Murata BLM21BD421SN1D is a single-line ferrite bead chip designed for signal line noise suppression. It features an impedance of 420 Ohms at 100 MHz and operates within a temperature range of -55°C to 125°C. The component utilizes a 0805 (2012 Metric) surface-mount package with dimensions of 2.00mm x 1.25mm x 1.45mm maximum height. It supports a rated current of 300mA and maintains a maximum DC resistance of 300 milliohms.

Chip Ferrite Bead Feature Summary

• Provides effective electromagnetic interference filtering for high-speed signal lines
• Utilizes compact 0805 surface-mount packaging for space-constrained designs
• Ensures stable performance across extended industrial temperature ranges

Chip Ferrite Bead Applications

• EMI suppression filters in general electronic circuits
• Noise reduction for high-speed signal lines
• Audio line noise filtering applications

Chip Ferrite Bead Procurement Notes

Verify the specific impedance tolerance and current rating requirements against the official Murata datasheet before integration. Confirm that the 0805 footprint matches the target PCB layout constraints. Ensure the operating temperature range aligns with the intended environmental conditions. Cross-reference the part number suffix to guarantee compatibility with existing supply chain documentation.

Chip Ferrite Bead Selection Notes

Select this component when designing circuits requiring moderate noise attenuation for sensitive signal paths. The 300mA current rating suits low-power digital interfaces. Consider the 420 Ohm impedance profile for frequencies around 100 MHz. Evaluate thermal management needs given the small form factor and power dissipation characteristics under load.

Chip Ferrite Bead Part Context

This component belongs to the Murata EMIFIL BLM21 series, which offers various impedance values and current ratings in standardized packages. The BD suffix indicates specific material properties optimized for signal line applications. This series is widely used in consumer electronics and industrial equipment for EMI control.

Chip Ferrite Bead Replacement Considerations

Consult the official Murata BLM21 series datasheet for direct substitutes with identical impedance and current ratings. Verify pinout compatibility and physical dimensions before swapping components. Ensure any alternative part meets the same temperature and regulatory standards.