BLM21AG221SN1D

Chip Ferrite Bead Overview

The Murata BLM21AG221SN1D is a single-line chip ferrite bead in an 0805 (2012 metric) surface-mount package. It provides 220 Ohms impedance at 100 MHz with a maximum DC resistance of 130 milliohms and a rated current of 800 mA. The component operates within a temperature range of -55°C to 125°C, measures 2.00mm x 1.25mm x 1.05mm, and complies with RoHS3 standards.

Chip Ferrite Bead Feature Summary

• Functions as a resistor at noise frequencies to minimize resonance and preserve signal waveform integrity
• Requires no ground connection for effective EMI suppression in circuits lacking stable ground lines
• Features nickel barrier external electrodes for enhanced solder heat resistance

Chip Ferrite Bead Applications

• On-board DC EMI suppression filters
• Noise filtering for audio lines
• General high-speed signal line protection

Chip Ferrite Bead Procurement Notes

Verify the specific suffix SN1D against official Murata documentation to confirm packaging type and terminal finish. Ensure the selected variant matches the required 800mA rating and 130mΩ DCR specifications for the target circuit design.

Chip Ferrite Bead Selection Notes

Select this component when low DC resistance is critical to prevent voltage drop while maintaining effective high-frequency noise attenuation. The 0805 footprint offers a balance between current handling capacity and board space efficiency for general-purpose applications.

Chip Ferrite Bead Part Context

This part belongs to the Murata EMIFIL BLM21AG series, designed for on-board EMI suppression. The AG sub-series specifically targets applications requiring moderate current handling with low insertion loss, distinguishing it from higher-current PG or automotive-grade BB variants.

Chip Ferrite Bead Replacement Considerations

MH2029-221Y by Bourns Inc. is listed as a direct substitute. Verify electrical parameters and physical dimensions before integration.