MI0603M121R-00

Overview

The MI0603M121R-00 is a monolithic ferrite bead chip from the MI series, manufactured by Laird-Signal Integrity Products. It features a 0603 (1608 metric) surface-mount package with dimensions of 1.60mm length and 0.80mm width. The component provides an impedance of 120 Ohms at 100 MHz and supports a maximum DC current rating of 2.5A. Its maximum DC resistance (DCR) is specified at 50 milliohms. The device operates within a temperature range of -40°C to +125°C. This specific part number is obsolete and no longer in production.

Feature Summary

• Monolithic single-line ferrite construction for compact circuit integration
• High current handling capability suitable for power line filtering applications
• Surface-mount design optimized for automated assembly processes

Applications

• Power supply output filtering
• Signal line noise suppression
• EMI reduction in high-current digital circuits

Procurement Notes

This component is officially discontinued and no longer manufactured. Verification of availability must rely on surplus or secondary market sources rather than direct factory orders. Engineers should confirm RoHS compliance status carefully, as this specific suffix indicates lead-containing material which may not meet modern environmental regulations. Cross-reference with the active replacement MI0603M121R-10 is recommended for new designs.

Selection Notes

Selection requires evaluating the 2.5A current rating against peak load requirements to prevent saturation. The 120 Ohm impedance at 100 MHz defines the attenuation profile for high-frequency noise. Designers must account for the higher DCR compared to newer revisions if voltage drop is critical. The obsolete status necessitates reviewing long-term supply chain stability before finalizing the bill of materials.

Part Context

Part of the Laird MI series ferrite beads, designed for general-purpose EMI suppression. The MI series offers various impedance and current ratings in standard footprints. This specific model represents an older generation product with lead-based composition, contrasting with newer RoHS-compliant variants in the same family.

Replacement Considerations

The direct replacement is MI0603M121R-10. This updated version maintains identical electrical characteristics but complies with RoHS standards. Verify pin compatibility and thermal performance during transition.