BLM31PG391SN1L

Chip Ferrite Bead Overview

The Murata BLM31PG391SN1L is a single-line chip ferrite bead in the EMIFIL BLM31_SN series, housed in a 1206 (3216 metric) surface-mount package. It provides an impedance of 390 Ohms at a test frequency of 100 MHz with a tolerance of 25%. The component supports a maximum DC current of 2 A and features a maximum DC resistance of 50 mOhms. It operates within a temperature range of -55°C to +125°C and measures 3.2 mm in length, 1.6 mm in width, and 1.1 mm in height.

Chip Ferrite Bead Feature Summary

• Designed for automotive applications as a noise filter for power lines
• Nickel barrier structure on external electrodes ensures excellent soldering thermal resistance
• Functions as a resistor at noise frequencies to maintain signal waveform integrity
• Eliminates EMI from continuous voltage lines without requiring a ground connection

Chip Ferrite Bead Applications

• Automotive electronic circuits
• Power supply line filtering
• Noise suppression in high-current environments

Chip Ferrite Bead Procurement Notes

Verify the specific suffix SN1L against official Murata documentation to confirm the exact termination and packaging configuration. Ensure the selected variant matches the required automotive qualification standards and physical dimensions for the target PCB footprint. Cross-reference the manufacturer part number directly with the datasheet to avoid confusion with similar series components.

Chip Ferrite Bead Selection Notes

Select this component when a 1206 footprint is required for high-current power line noise suppression in automotive systems. The 390 Ohm impedance at 100 MHz targets specific electromagnetic interference frequencies. Verify that the 2 A current rating meets the circuit's operational requirements and that the low DC resistance minimizes voltage drop across the filter.

Chip Ferrite Bead Part Context

This component belongs to the Murata EMIFIL BLM31 series, specifically engineered for automotive use. The PG designation indicates a high-current capability variant within the standard 1206 package family. These beads are designed to suppress electromagnetic interference in power lines while maintaining signal integrity without the need for grounding.

Chip Ferrite Bead Replacement Considerations

Consult the official Murata BLM31 datasheet for verified substitute part numbers within the same series that match the required impedance and current ratings.