BLM21BB121SN1D

Chip Ferrite Bead Overview

The Murata BLM21BB121SN1D is a surface-mount ferrite bead in the 0805 (2012 metric) package. It provides an impedance of 120 Ohms at 100 MHz with a tolerance of 25%. The component supports a maximum DC current of 600 mA and has a maximum DC resistance of 190 mOhms. Operating temperatures range from -55°C to +125°C. Physical dimensions are 2.00 mm length, 1.25 mm width, and 0.85 mm height. It is AEC-Q200 qualified.

Chip Ferrite Bead Feature Summary

• Designed for high-speed signal line applications to suppress high-frequency noise
• Single-line configuration suitable for EMI suppression filters
• Automotive-grade qualification ensures reliability under varying thermal conditions

Chip Ferrite Bead Applications

• High-speed signal line noise suppression
• EMI suppression filter circuits
• Power supply filtering

Chip Ferrite Bead Procurement Notes

Verify the specific suffix against official documentation to confirm exact electrical tolerances and packaging specifications. Ensure the selected variant matches the required impedance and current ratings for the target circuit design. Cross-reference datasheets for accurate mechanical footprint details before finalizing procurement orders.

Chip Ferrite Bead Selection Notes

Select this component when a 0805 footprint is required for single-line noise attenuation. The 600 mA rating suits moderate current paths, while the 120 Ohm impedance targets specific frequency bands. Verify that the low DC resistance minimizes voltage drop in sensitive signal lines compared to higher-resistance alternatives.

Chip Ferrite Bead Part Context

This part belongs to the Murata EMIFIL BLM21BB series, which specializes in chip ferrite beads for suppressing high-frequency noise in high-speed signal lines. The series offers various impedance values within the standard 0805 package size, providing designers with flexible options for EMI control in compact electronic assemblies.

Chip Ferrite Bead Replacement Considerations

Direct substitutes include other BLM21BB variants with identical 120 Ohm impedance and 0805 footprint, such as BLM21BB121SH1D. Ensure replacement parts maintain the same 600 mA current rating and physical dimensions to fit existing PCB layouts without modification.

Chip Ferrite Bead FAQ

Is the BLM21BB121SN1D suitable for automotive applications?

Yes, the component is AEC-Q200 qualified, indicating it meets automotive reliability standards.

What is the maximum DC current rating for this ferrite bead?

The maximum DC current rating is 600 mA.