74278009

Overview

The Würth Elektronik 74278009 is a solid flat ferrite core designed for flexible printed circuit boards. It operates at a test frequency of 100 MHz with an impedance of 100 Ohms. The component features a solid design with internal dimensions of 24.00 mm width by 0.75 mm height and external dimensions of 28.00 mm width by 3.50 mm height. It belongs to the WE-FLAT series and is intended for EMI suppression applications.

Feature Summary

• Solid flat design optimized for flexible PCB integration
• Provides 100 Ohms impedance at 100 MHz for EMI suppression
• Specifically engineered for use with flexible ribbon cables

Applications

• EMI suppression on flexible printed circuits
• Noise filtering for flexible ribbon cables
• Signal integrity enhancement in compact electronic assemblies

Procurement Notes

Verify the specific impedance value and physical dimensions against the official datasheet before procurement, as variations may exist within the WE-FLAT series. Confirm that the solid construction meets the mechanical requirements of the target flexible PCB application. Ensure compatibility with the intended cable width and thickness for effective magnetic coupling.

Selection Notes

Select this component when EMI suppression is required specifically for flexible interconnects rather than rigid traces. The 100 Ohm impedance at 100 MHz targets common high-frequency noise profiles. Consider the physical footprint constraints, as the flat profile requires adequate clearance around the flexible cable routing area on the board layout.

Part Context

This part belongs to the WE-FLAT series from Würth Elektronik, which specializes in ferrite solutions for flat and flexible cabling. Unlike standard toroidal or snap-on cores, these components are shaped to accommodate the unique geometry of flexible printed circuits and ribbon cables, providing targeted noise reduction without adding significant bulk.

Replacement Considerations

Check for direct substitutes within the WE-FLAT series offering different impedance values if noise frequencies vary. Verify that any alternative maintains the same internal width and height specifications to ensure proper fit over the existing flexible cable assembly.