BLM21RK121SN1D

Chip Ferrite Bead Overview

The Murata BLM21RK121SN1D is a single-line chip ferrite bead from the EMIFIL BLM21 series, designed for surface-mount assembly in the 0805 (2012 metric) package. It provides an impedance of 120 ohms at 100 MHz with a maximum DC resistance of 200 milliohms and a rated current of 200 mA. The component operates within a temperature range of -55°C to +125°C and measures 2.00 mm in length, 1.25 mm in width, and up to 1.05 mm in height.

Chip Ferrite Bead Feature Summary

• Provides high-impedance noise suppression for signal lines at 100 MHz
• Supports continuous currents up to 200 mA with low DC resistance
• Engineered for reliable operation across extended industrial temperature ranges

Chip Ferrite Bead Applications

• EMI suppression filters for audio line circuits
• Noise filtering on high-speed digital signal interfaces
• Power supply line conditioning for sensitive ICs

Chip Ferrite Bead Procurement Notes

Verify the specific suffix SN1D against official Murata documentation to confirm packaging type and tape dimensions. Ensure the procurement channel sources genuine components matching the BLM21RK series specifications. Cross-reference the manufacturer part number with authorized distributor databases to validate authenticity and traceability before finalizing orders.

Chip Ferrite Bead Selection Notes

Select this component when a 0805 footprint is required for 120 ohm impedance at 100 MHz. Confirm that the 200 mA current rating meets the circuit's operational requirements. Consider the 200 milliohm DC resistance impact on voltage drop. Verify compatibility with standard reflow soldering profiles for 0805 surface-mount devices.

Chip Ferrite Bead Part Context

This part belongs to the Murata EMIFIL BLM21 family of chip ferrite beads. These components are widely used for electromagnetic interference suppression in compact electronic designs. The BLM21 series offers various impedance and current ratings within standardized packages to support diverse filtering needs in consumer and industrial electronics.

Chip Ferrite Bead Replacement Considerations

Check Murata datasheets for alternative BLM21RK variants with identical 0805 dimensions and 120 ohm impedance. Verify that substitute parts maintain the same 200 mA current handling capability and thermal characteristics to ensure functional equivalence without redesign.