74279277

Overview

The Würth Elektronik 74279277 is a WE-CBF series ferrite chip bead designed for EMI suppression in signal lines. It features a 0402 (1005 metric) surface-mount package with dimensions of 1.00mm x 0.50mm and a maximum height of 0.55mm. The component provides an impedance of 70 Ohms at 100 MHz and supports a rated current of 500mA. Its maximum DC resistance is 150 milliohms, ensuring minimal signal loss while effectively attenuating high-frequency noise.

Feature Summary

• Provides effective electromagnetic interference suppression for single signal lines through high-impedance characteristics at target frequencies.
• Utilizes a compact 0402 surface-mount footprint to facilitate dense circuit board layouts and automated assembly processes.
• Maintains low DC resistance to preserve signal integrity while handling specified current loads without excessive power dissipation.

Applications

• EMI suppression in portable digital devices
• Signal line filtering in flat cable assemblies
• High-frequency noise attenuation in compact electronic circuits

Procurement Notes

Verify the specific ordering suffix to confirm the correct packaging format, such as tape and reel or cut tape, as these affect handling procedures. Ensure compliance with RoHS3 standards and check the moisture sensitivity level before storage. Confirm the AEC-Q200 qualification status if the application requires automotive-grade reliability standards.

Selection Notes

Select this component when space constraints require a 0402 footprint for signal line filtering. The 70 Ohm impedance at 100 MHz suits applications targeting specific high-frequency noise profiles. Verify that the 500mA current rating exceeds the maximum operating current of the protected line to prevent saturation and ensure stable performance under load conditions.

Part Context

This part belongs to the WE-CBF series from Würth Elektronik, which specializes in small-size SMD EMI suppression ferrite beads. The series offers various impedance values and current ratings across multiple package sizes, including 0402, 0603, and 0805, to address diverse EMC requirements in modern electronics design.

Replacement Considerations

Cross-reference other WE-CBF series parts with matching 0402 dimensions and similar impedance-current trade-offs. Verify that any substitute maintains the same 150 milliohm maximum DC resistance and 500mA rating to ensure equivalent thermal and electrical performance in the existing circuit layout.