BLM21HE472SN1L

Chip Ferrite Bead Overview

The Murata BLM21HE472SN1L is a single-line ferrite chip bead in the EMIFIL BLM21 series, housed in an 0805 (2012 metric) surface-mount package. It provides an impedance of 4700 Ohms at 100 MHz with a tolerance of 25%. The component supports a maximum DC current of 850 mA and features a maximum DC resistance of 400 mOhms. It operates within a temperature range of -55°C to +125°C and complies with RoHS3 standards.

Chip Ferrite Bead Feature Summary

• Provides high-impedance noise suppression for signal lines in compact surface-mount designs
• Capable of handling high DC bias currents suitable for power-sensitive applications
• Constructed from stable ferrite material ensuring reliable performance across wide temperature ranges

Chip Ferrite Bead Applications

• EMI suppression filters for general electronic circuits
• Noise filtering on high-speed signal lines
• Power supply line decoupling in portable devices

Chip Ferrite Bead Procurement Notes

Verify the specific suffix against official Murata documentation to confirm impedance and current ratings. Ensure the ordering code matches the required 0805 footprint and termination style. Confirm compliance requirements such as RoHS3 status directly from the manufacturer datasheet before finalizing procurement specifications.

Chip Ferrite Bead Selection Notes

Select this component when high DC current capacity is required alongside significant noise attenuation. The 0805 package offers a balance between thermal performance and board space efficiency. Compare the 400 mOhm DC resistance against circuit loss tolerances to ensure minimal voltage drop during operation.

Chip Ferrite Bead Part Context

This part belongs to the Murata BLM21 family of ferrite beads, designed for EMI suppression in digital and analog circuits. The HE variant specifically indicates characteristics optimized for higher current handling compared to standard variants within the same physical footprint.

Chip Ferrite Bead Replacement Considerations

Direct substitutes include other 0805 ferrite beads with similar 4700 Ohm impedance and 850 mA current ratings. Verify that alternative components match the 400 mOhm DC resistance and operating temperature limits to maintain circuit integrity.