BLM15EX121SN1D

Chip Ferrite Bead Overview

The Murata BLM15EX121SN1D is a multi-layer ferrite bead designed for noise suppression in power and signal lines. It features an impedance of 120 Ohms at 100 MHz with a tolerance of 25%. The component supports a maximum DC current of 1.8 A and has a maximum DC resistance of 75 mOhms. Housed in a compact 0402 (1005 metric) surface-mount package measuring 1.0 mm x 0.5 mm x 0.5 mm, it operates within a temperature range of -55°C to +125°C.

Chip Ferrite Bead Feature Summary

• Multi-layer construction provides effective high-frequency noise attenuation without requiring a ground connection.
• Nickel barrier layer on external electrodes ensures superior soldering heat resistance during assembly.
• Designed to minimize resonance possibilities, ensuring signal integrity remains undistorted.

Chip Ferrite Bead Applications

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

Chip Ferrite Bead Procurement Notes

Verify the specific suffix SN1D against official Murata documentation to confirm packaging configuration and tape-and-reel specifications. Ensure compatibility with RoHS3 standards if required by your manufacturing process. Cross-reference the impedance value at 100 MHz with circuit simulation tools like SimSurfing to validate performance under actual load conditions before finalizing procurement.

Chip Ferrite Bead Selection Notes

Select this component when space constraints require a 0402 footprint while maintaining a 1.8 A current rating. The 120 Ohm impedance is suitable for general-purpose noise suppression in low-impedance lines. Consider the 75 mOhm DCR impact on voltage drop in power delivery networks. Verify that the operating temperature range meets the environmental requirements of the target application.

Chip Ferrite Bead Part Context

This part belongs to the BLM15E_SN series of EMIFIL chip ferrite beads. The series is characterized by small size and low DC resistance, making it ideal for portable devices. The BLM15EX variant specifically denotes the material composition and impedance characteristics optimized for GHz-band noise suppression in consumer electronics and industrial applications.

Chip Ferrite Bead Replacement Considerations

Direct substitutes include other Murata parts within the BLM15E series sharing identical impedance and current ratings, such as BLM15EG121SN1D or BLM15PX121SN1D, provided their DC resistance values align with system requirements. Verify pinout and mechanical dimensions match the existing PCB layout.

Chip Ferrite Bead FAQ

Does the BLM15EX121SN1D require a ground connection?

No, the device does not require a ground connection, making it suitable for circuits lacking a stable ground reference.

What is the test frequency for the specified impedance?

The impedance of 120 Ohms is measured at a test frequency of 100 MHz.