BLM15AG121SN1D

Chip Ferrite Bead Overview

The Murata BLM15AG121SN1D is a single-line chip ferrite bead in the EMIFIL BLM15A series, housed in an unshielded 0402 (1005 metric) SMD package. It provides 120 Ohms impedance at 100 MHz with a 25% tolerance and a maximum DC resistance of 190 mOhms. Rated for a maximum DC current of 550 mA, it operates within a temperature range of -55°C to +125°C. The component meets AEC-Q200 automotive qualification standards.

Chip Ferrite Bead Feature Summary

• Provides high-frequency noise suppression without requiring a ground connection
• Features nickel barrier layers on external electrodes for superior soldering heat resistance
• Designed to minimize resonance risks and ensure signal integrity

Chip Ferrite Bead Applications

• EMI suppression in notebook computers
• Noise suppression for digital still cameras
• Prevention of errors caused by local oscillator signals in mobile phones

Chip Ferrite Bead Procurement Notes

Verify the specific suffix 'SZ1D' against official Murata documentation to confirm exact packaging and tape specifications. Ensure the selected variant matches the required AEC-Q200 automotive qualification status. Cross-reference the impedance value and current rating with the target circuit design to prevent saturation or insufficient filtering performance.

Chip Ferrite Bead Selection Notes

Select this component for applications requiring compact EMI filtering in low-impedance lines where grounding is unavailable. The 0402 footprint suits space-constrained designs. Verify that the 550mA current rating exceeds the peak operating current of the protected line to avoid excessive DC resistance rise or thermal issues during operation.

Chip Ferrite Bead Part Context

This part belongs to the Murata BLM15 family of multi-layer ferrite beads designed for GHz-band noise suppression. The BLM15A sub-series specifically targets automotive and industrial reliability requirements. These components are engineered to suppress electromagnetic interference in data lines and power supplies while maintaining signal fidelity in sensitive electronic circuits.

Chip Ferrite Bead Replacement Considerations

Publicly confirmed substitutes include TDK MMZ1005S121CT000 and Eaton MFBM1V1005-121-R.