74271251

Overview

The Würth Elektronik 74271251 is a grey STAR-TEC snap ferrite core designed for electromagnetic interference suppression. It features a split-core design with a safety key mechanism to secure the assembly. The component has an internal diameter of 25 mm, accommodating cables up to that thickness. It exhibits an impedance of 525 ohms at 100 MHz and 836 ohms at 1 MHz. The unit operates within a temperature range of -40°C to +105°C and complies with RoHS standards.

Feature Summary

• Snap-fit installation mechanism with integrated safety key for secure locking
• Split-core construction allowing installation on existing cable assemblies
• High impedance performance across specified frequency ranges for EMI suppression

Applications

• General electronic equipment EMI filtering
• Cable harness noise reduction in industrial settings
• Suppression of conducted emissions on power and signal lines

Procurement Notes

Verify the specific impedance requirements against application frequencies, noting the difference between 1 MHz and 100 MHz values. Confirm cable diameter compatibility with the 25 mm internal opening. Ensure the safety key function meets mechanical retention needs. Check for RoHS compliance documentation if required by target market regulations. Validate packaging quantity expectations as bulk quantities may vary.

Selection Notes

Select this model when a quick-install solution is needed for cables around 25 mm in diameter. The STAR-TEC series offers consistent material properties (4W620) for predictable attenuation. Consider the physical dimensions (approx. 52x25x25 mm) for spatial constraints. The safety key feature distinguishes it from standard snap rings where vibration resistance is critical. Compare impedance curves if specific frequency attenuation profiles are mandatory.

Part Context

This component belongs to the WE-STAR-TEC series of split-core ferrites from Würth Elektronik. These cores utilize a specific manganese-zinc ferrite material optimized for broadband noise suppression. The series includes various sizes and impedance ratings to suit different cable diameters and frequency requirements. The safety key variant ensures the core remains closed during operation.

Replacement Considerations

Direct substitutes require matching the 25 mm ID, 525 ohm @ 100 MHz impedance, and snap-fit style with safety key. Other manufacturers offer similar split-core designs, but material composition and exact impedance curves must be verified. Würth part numbers like 74271xxx series share the same mounting style but differ in size and impedance.