742700391

Overview

The Würth Elektronik part number 742700391 is a solid cylindrical ferrite core from the WE-AFB series, designed for electromagnetic interference (EMI) suppression in axial configurations. The component features an inner diameter of 5.45 mm and an outer diameter of 7.8 mm, with a total length of 9.8 mm. It provides an impedance of 45 ohms at standard test frequencies. This material formulation supports effective noise attenuation for small-diameter cables.

Feature Summary

• Solid cylindrical construction for stable EMI suppression
• Axial configuration suitable for wire wrapping or insertion
• Optimized magnetic material for high-frequency noise reduction

Applications

• Suppression on small diameter coaxial cables
• Noise filtering on signal wires in electronic assemblies
• Common mode choke applications for data lines

Procurement Notes

Verify the specific impedance tolerance and frequency response curve against the official datasheet before integration. Confirm that the 5.45 mm inner diameter accommodates the target cable insulation thickness without excessive friction during installation. Ensure the operating temperature range meets the environmental requirements of the final assembly.

Selection Notes

Select this solid core when a snap-on design is not feasible due to space constraints or cable geometry. The fixed dimensions require precise matching to the cable outer diameter. Consider the 45 ohm impedance level relative to the noise spectrum; higher impedance may be needed for broader bandwidth suppression. Evaluate mechanical retention needs as solid cores lack locking mechanisms.

Part Context

This component belongs to the WE-AFB series of solid ferrite cores manufactured by Würth Elektronik. Unlike split-core variants, these are single-piece cylinders intended for permanent installation onto wires. The series focuses on compact form factors for dense PCB layouts or tight cable bundles where space is limited compared to larger clamp-on solutions.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Cross-referencing requires matching the 5.45 mm ID, 7.8 mm OD, 9.8 mm length, and 45 ohm impedance specifications exactly.