BLM18AG121SN1D

Chip Ferrite Bead Overview

The Murata BLM18AG121SN1D is a single-line chip ferrite bead in the EMIFIL BLM18AG series, housed in an EIA 0603 (1608 metric) surface-mount package measuring 1.6 x 0.8 x 0.8 mm. It provides an impedance of 120 Ohms at 100 MHz with a tolerance of ±25%. The component supports a maximum DC current rating of 800 mA and features a maximum DC resistance of 180 mΩ. It operates within a temperature range of -55°C to +125°C.

Chip Ferrite Bead Feature Summary

• Provides high-frequency noise suppression for signal lines without requiring a ground connection.
• Features a nickel barrier electrode structure to ensure excellent soldering heat resistance during assembly.
• Designed to minimize resonance risks, thereby preserving signal waveform integrity.

Chip Ferrite Bead Applications

• High-speed data line filtering in portable electronic devices
• EMI suppression in industrial control systems
• Power management circuits requiring low-impedance paths

Chip Ferrite Bead Procurement Notes

Verify the complete part number against official Murata documentation to confirm the specific suffix codes, as these define critical electrical tolerances and packaging configurations. Ensure compatibility with RoHS directives and check for AEC-Q200 automotive qualification if the application requires it. Cross-reference datasheets for any recent design changes or obsolescence notices before finalizing procurement plans.

Chip Ferrite Bead Selection Notes

Select this component when a compact 0603 footprint is required for noise suppression on single-ended lines carrying up to 800 mA. The 120 Ω impedance at 100 MHz targets common high-frequency interference. Consider the 180 mΩ DC resistance for voltage drop calculations in power-sensitive applications. Verify that the operating temperature range meets the environmental requirements of the target system.

Chip Ferrite Bead Part Context

This component belongs to the Murata EMIFIL BLM18AG series, which specializes in chip ferrite beads for general-purpose noise reduction. The series is characterized by its small form factor and robust construction suitable for automated surface-mount assembly. It serves as a passive filter element widely used across consumer electronics and industrial equipment to mitigate electromagnetic interference.

Chip Ferrite Bead Replacement Considerations

The BLM11A121SPT is listed as an alternative part number for similar specifications. Verify impedance values, current ratings, and physical dimensions against the original datasheet before substitution to ensure circuit performance remains unaffected.

Chip Ferrite Bead FAQ

Does the BLM18AG121SN1D require a ground connection?

No, this single-line ferrite bead does not require a ground connection for effective noise suppression.

What is the maximum DC current rating for this component?

The maximum DC current rating is 800 mA.