BLM18BD421BH1D

Chip Ferrite Bead Overview

The Murata BLM18BD421BH1D is a single ferrite chip bead in the 0603 (1608 metric) surface-mount package. It provides an impedance of 420 Ohms at a test frequency of 100 MHz with a tolerance of 25%. The component supports a maximum DC current of 250 mA and exhibits a maximum DC resistance of 550 mOhms. It operates within a temperature range of -55°C to +125°C. The device measures 1.6 mm in length, 0.8 mm in width, and 0.8 mm in height.

Chip Ferrite Bead Feature Summary

• Suppresses high-frequency electromagnetic interference in power lines
• Designed for surface-mount assembly on printed circuit boards
• Provides stable noise attenuation across specified operating temperatures

Chip Ferrite Bead Applications

• Power line filtering in portable electronic devices
• Noise suppression in automotive electronics circuits
• Signal integrity management in industrial control systems

Chip Ferrite Bead Procurement Notes

Verify the specific suffix BH1D against official Murata documentation to confirm packaging type and material specifications. Ensure the selected variant matches the required impedance and current ratings for the target application. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm authenticity and availability status before finalizing procurement orders.

Chip Ferrite Bead Selection Notes

Select this component when a 0603 footprint is required for high-current noise suppression. The 250 mA rating suits moderate power applications where space is constrained. Compare the 420 Ohm impedance profile against alternative ferrite beads to ensure compatibility with the specific frequency spectrum of the noise being mitigated in the circuit design.

Chip Ferrite Bead Part Context

This component belongs to the Murata BLM18 series of ferrite beads, which are widely used for EMI suppression. The BLM18 designation indicates the standard 0603 case size. These components are engineered to attenuate unwanted high-frequency signals while maintaining low insertion loss for desired DC or low-frequency currents in compact electronic assemblies.

Chip Ferrite Bead Replacement Considerations

Consult official Murata substitution guides for verified equivalents. Ensure any replacement maintains the 0603 footprint, 420 Ohm impedance at 100 MHz, and 250 mA current handling capability without altering the thermal or electrical performance requirements.