LI0402D121R-00

Chip Ferrite Bead Overview

The LI0402D121R-00 is a surface-mount ferrite bead designed for EMI filtering in signal and power lines. It features a 0402 (1005 Metric) package with dimensions of 0.039" length, 0.020" width, and 0.020" height. The component provides an impedance of 120 Ohms at 100 MHz and supports a maximum current rating of 400 mA. Its DC resistance is specified as a maximum of 400 milliohms. The device operates within a temperature range of -40°C to 125°C.

Chip Ferrite Bead Feature Summary

• Provides electromagnetic interference suppression through high impedance characteristics at target frequencies.
• Designed for compact surface-mount integration on printed circuit boards.

Chip Ferrite Bead Applications

• Signal line noise filtering
• Power line noise suppression

Chip Ferrite Bead Procurement Notes

Verify the obsolete status of this specific part number before initiating procurement processes. Confirm availability of active replacements such as the LI0402D121R-10 variant if current stock is unavailable. Ensure that the replacement component matches the required impedance, current rating, and physical footprint specifications for the intended application design.

Chip Ferrite Bead Selection Notes

Select this component for applications requiring compact EMI suppression in tight space constraints. Evaluate the 400 mA current rating against peak operational loads to prevent saturation. Consider the 120 Ohm impedance profile relative to the target noise frequency spectrum. Verify compatibility with standard surface-mount assembly processes and reflow soldering profiles.

Chip Ferrite Bead Part Context

This ferrite bead belongs to the Laird-Signal Integrity Products lineup focused on passive filtering solutions. It serves as a critical component for maintaining signal integrity in high-speed digital circuits. The product represents a transition point where newer RoHS-compliant variants may be preferred over older non-compliant versions.

Chip Ferrite Bead Replacement Considerations

LI0402D121R-10 is listed as a direct substitute.