BLA31BD221SN4D

Chip Ferrite Bead Overview

BLA31BD221SN4D is a ferrite bead array manufactured by Murata Electronics, designed for EMI suppression in signal lines. It features a 1206 (3216 metric) surface-mount package with four independent channels. The component provides an impedance of 220 Ohms at 100 MHz and supports a maximum DC current of 150 mA. Its maximum DC resistance is specified at 900 milliohms. The device operates within a temperature range of -55°C to +125°C and complies with RoHS standards.

Chip Ferrite Bead Feature Summary

• Four-channel configuration for multi-signal line filtering
• High-density 1206 surface-mount footprint
• EMI suppression capability for digital signals

Chip Ferrite Bead Applications

• Digital signal line noise filtering
• Clock circuit EMI suppression
• Data bus protection

Chip Ferrite Bead Procurement Notes

Verify the specific impedance tolerance and DC resistance values against the official Murata datasheet prior to procurement. Confirm that the 1206 package dimensions align with the target PCB layout constraints. Ensure the selected supplier provides documentation confirming RoHS compliance and material safety data sheets for regulatory adherence.

Chip Ferrite Bead Selection Notes

Select this component when a compact four-channel ferrite array is required for high-speed digital interfaces. The 1206 package offers a balance between current handling capacity and board space efficiency. Consider the 220 Ohm impedance rating relative to the target noise frequencies and ensure the 150 mA current rating exceeds the maximum operating current of the protected lines.

Chip Ferrite Bead Part Context

The BLA31BD series belongs to Murata's EMIFIL family of chip ferrite beads. These components are engineered for suppressing electromagnetic interference in portable devices and industrial electronics. The BLA31BD variant specifically utilizes a block-type construction to provide stable performance across wide frequency ranges while maintaining low insertion loss for DC power transmission.

Chip Ferrite Bead Replacement Considerations

BLA31BD221ST4D is a documented parameter-equivalent substitute from Murata Electronics.