BLM18BD421SZ1D

Chip Ferrite Bead Overview

The Murata BLM18BD421SZ1D is a single-line ferrite chip bead in the BLM18_Z series, housed in a 0603 (1.6mm x 0.8mm) SMD package with a maximum height of 0.6mm. It provides an impedance of 120 Ohms at a test frequency of 100 MHz with a tolerance of 25%. The component supports a maximum DC current of 300 mA and has a maximum DC resistance of 400 mOhms. It operates within a temperature range of -55°C to +125°C and holds AEC-Q200 qualification.

Chip Ferrite Bead Feature Summary

• Provides high-frequency noise suppression for signal lines through ferrite material properties
• Designed for surface-mount assembly in compact electronic circuits
• Qualified for automotive applications under AEC-Q200 standards

Chip Ferrite Bead Applications

• Noise filtering in automotive electronic systems
• Signal line protection in compact consumer electronics
• High-frequency interference suppression in mobile devices

Chip Ferrite Bead Procurement Notes

Verify the specific suffix 'SZ1D' against official Murata documentation to confirm the 0.6mm height and 120 Ohm impedance specifications. Ensure the selected variant matches the required current rating and thermal characteristics for the target application environment. Cross-reference the part number with authorized distributors to confirm availability and authenticity.

Chip Ferrite Bead Selection Notes

Select this component when a low-profile 0603 ferrite bead with 120 Ohm impedance is required for signal integrity management. Consider the 300 mA current rating and 400 mOhm DC resistance for power loss calculations. Verify compatibility with automated pick-and-place equipment due to the small form factor and ensure the operating temperature range meets system requirements.

Chip Ferrite Bead Part Context

This component belongs to the Murata EMIFIL BLM18 series, specifically the Z sub-series designed for general-purpose noise suppression. It utilizes monolithic ferrite technology to attenuate electromagnetic interference in digital and analog circuits. The BLM18 format offers a standard footprint suitable for high-density PCB layouts commonly found in modern portable and automotive electronics.

Chip Ferrite Bead Replacement Considerations

Direct substitutes include other 0603 ferrite beads with similar 120 Ohm impedance and current ratings, such as the BLM18BD121SN1D or BLM18PG121SN1D. Verify that alternative parts match the physical dimensions, specifically the 0.6mm height constraint, and maintain equivalent AEC-Q200 qualification if automotive use is intended.