74279203

Overview

The Würth Elektronik 74279203 is a surface-mount EMI suppression ferrite bead from the WE-CBF series, housed in an 0805 (2012 metric) package. It provides an impedance of 150 Ohms at 100 MHz and supports a maximum DC current of 300 mA. The component features a maximum DC resistance of 250 mΩ and operates within a temperature range of -55°C to +125°C. It is AEC-Q200 qualified for automotive reliability.

Feature Summary

• Provides high-impedance attenuation for single signal lines to suppress electromagnetic interference
• AEC-Q200 qualified for automotive electronic applications
• Designed for compact surface-mount assembly on printed circuit boards

Applications

• Signal line filtering in automotive electronics
• EMI suppression in portable digital devices
• Noise reduction in data transmission circuits

Procurement Notes

Verify the specific impedance tolerance and DC resistance values against the official datasheet before integration. Confirm that the 0805 footprint matches the target PCB layout. Ensure the selected supplier sources genuine components with valid RoHS compliance documentation to meet regulatory requirements.

Selection Notes

Select this component when a low-profile SMD solution is required for single-line noise suppression. The 300 mA rating suits low-power signal paths rather than high-current power rails. Consider the 150 Ohm impedance profile for frequencies around 100 MHz where moderate attenuation is sufficient.

Part Context

This ferrite bead belongs to the WE-CBF series, which offers various impedance and current ratings in standard footprints. It serves as a passive filter element distinct from inductors or capacitors, specifically optimized for broadband noise absorption in sensitive electronic circuits.

Replacement Considerations

Check manufacturer cross-reference lists for direct equivalents. Verify that any substitute maintains the 0805 dimensions, 150 Ohm impedance at 100 MHz, and 300 mA current handling capability to ensure functional compatibility.