28R1261-200

Overview

The 28R1261-200 is a solid free-hanging ferrite core manufactured by Laird-Signal Integrity Products, designed for electromagnetic interference suppression on cables. It exhibits an impedance of 135 Ohms at a test frequency of 100 MHz. The component features a flat ribbon cable slot with an internal length of 25.1 mm and an internal height of 0.90 mm. External dimensions include a width of 32 mm and a height of 7.75 mm. The core utilizes material composition 28 and operates within a temperature range of -40°C to +125°C.

Feature Summary

• Solid construction provides stable magnetic properties for consistent noise attenuation across varying environmental conditions.
• Flat ribbon cable slot design allows for easy installation over wide bus cables without requiring disconnection.
• High permeability material composition ensures effective high-frequency signal absorption for EMI reduction.

Applications

• Suppression of electromagnetic interference on flat ribbon cables in computer peripherals
• Noise filtering on data transmission lines in industrial control systems
• EMI mitigation on power and signal cables in automotive electronics

Procurement Notes

Verify the specific impedance value of 135 Ohms at 100 MHz against your circuit requirements. Confirm that the internal slot dimensions accommodate the target cable thickness. Ensure compliance with RoHS3 standards if required by your manufacturing process. Check for any specific handling instructions regarding mechanical stress on the solid core during assembly.

Selection Notes

Select this component when dealing with flat ribbon cables rather than round wires due to its specific slot geometry. Consider the 135 Ohm impedance profile for frequencies around 100 MHz where moderate attenuation is sufficient. Evaluate the physical size constraints to ensure the external dimensions fit within the available enclosure space. Compare against other material compositions if higher or lower impedance is needed for different frequency bands.

Part Context

This part belongs to the 28R series of cable ferrites from Laird-Signal Integrity Products. These components are engineered specifically for suppressing common-mode noise on cable assemblies. The series offers various impedance values and physical sizes to suit different cable types and noise profiles, providing a standardized solution for EMI compliance in electronic designs.

Replacement Considerations

Direct substitutes must match the 135 Ohm impedance at 100 MHz and the flat ribbon cable slot dimensions. Verify that alternative parts support the same operating temperature range and material composition. Ensure the replacement maintains similar physical footprint to avoid mechanical interference in existing enclosures.