74279391

Overview

The Würth Elektronik part number 74279391 is a surface-mount ferrite bead from the WE-PBF series. It provides an impedance of 91 ohms at 100 MHz with a maximum DC current rating of 17 A and a maximum DC resistance of 900 µohm. The component features a tolerance of ±25% and operates within a temperature range of -55°C to +125°C. Its physical dimensions are 3 mm in width, 2.55 mm in height, and it utilizes a two-terminal SMD package.

Feature Summary

• High current handling capability suitable for power line filtering applications
• Low DC resistance minimizes voltage drop and power loss in the circuit
• Compact surface-mount design facilitates automated assembly processes

Applications

• Power supply output filtering
• DC-DC converter noise suppression
• General electronic equipment EMI mitigation

Procurement Notes

Verify the specific impedance value and current rating against the official datasheet before integration. Confirm that the operating temperature range meets the environmental requirements of the final assembly. Ensure the surface-mount footprint matches the PCB layout specifications to prevent mechanical stress or soldering defects during reflow processes.

Selection Notes

Select this component when high current capacity is required alongside effective high-frequency noise attenuation. The low DC resistance makes it suitable for power rails where efficiency is critical. Consider the physical size constraints of the board space available for surface-mount components. Evaluate the thermal performance under continuous load conditions to ensure reliability over the product lifecycle.

Part Context

This component belongs to the WE-PBF series, which consists of flat wire ferrite beads designed for general electronic equipment. These parts are engineered to suppress electromagnetic interference in circuits carrying significant direct current. The series offers various impedance values and current ratings to suit different power management needs.

Replacement Considerations

Check for equivalent parts in the WE-PBF series with matching 91 ohm impedance and 17 A current rating. Verify dimensional compatibility if substituting with other manufacturers' surface-mount ferrite beads. Ensure the replacement part meets the same temperature and resistance specifications.