BLM18RK121SN1D

Chip Ferrite Bead Overview

The Murata BLM18RK121SN1D is a single-line chip ferrite bead in the BLM18_xN series, housed in an EIA 0603 (1.6 x 0.8 x 0.8 mm) surface-mount package. It provides an impedance of 120 Ω at 100 MHz with a tolerance of ±25%. The component supports a maximum DC current of 200 mA and features a maximum DC resistance of 250 mΩ. It operates within a temperature range of -55°C to +125°C.

Chip Ferrite Bead Feature Summary

• Designed for high-frequency noise suppression in power lines without requiring a ground connection.
• Features a nickel barrier electrode structure to ensure excellent soldering heat resistance.
• Multi-layer construction reduces resonance probability to maintain signal waveform integrity.

Chip Ferrite Bead Applications

• EMI suppression filters
• Power supply circuits
• General electronic equipment

Chip Ferrite Bead Procurement Notes

Verify the specific suffix against official Murata documentation to confirm exact impedance and current ratings. Ensure the ordering code matches the required 0603 package dimensions and terminal configuration. Confirm compliance with RoHS and REACH standards if applicable to the target market. Cross-reference the manufacturer part number with distributor listings to avoid substitution errors.

Chip Ferrite Bead Selection Notes

Select this component when low current handling up to 200 mA is sufficient for the application. The 0603 footprint is suitable for space-constrained designs requiring standard ferrite bead performance. Consider the 250 mΩ DC resistance impact on voltage drop in sensitive power rails. Evaluate the 120 Ω impedance at 100 MHz against the specific noise frequency spectrum present in the circuit.

Chip Ferrite Bead Part Context

This component belongs to the Murata EMIFIL BLM18_xN series of multi-layer ferrite beads. These devices are engineered for compact EMI suppression in portable and industrial electronics. The series utilizes specialized ferrite materials optimized for high-frequency absorption characteristics within a standardized surface-mount form factor.

Chip Ferrite Bead Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source data. Verify compatibility with alternative manufacturers by matching impedance curves, current ratings, and physical dimensions before implementation.

Chip Ferrite Bead FAQ

Does the BLM18RK121SN1D require a ground connection?

No, these chip ferrite beads do not require a ground connection, making them suitable for circuits without stable grounding.

What is the maximum operating temperature?

The maximum operating temperature is +125°C.