ESD-R-38B

Overview

The KEMET ESD-R-38B is a toroidal ferrite core designed for electromagnetic interference suppression. It features an internal diameter of 17.9 mm and an outer diameter of 42.4 mm. The component exhibits an impedance of 80 ohms at 100 MHz and 40 ohms at 25 MHz. Constructed from manganese-zinc material, it operates within a temperature range of -25 °C to +60 °C. The physical dimensions are 42.4 mm in width, 16 mm in height, and 17.5 mm in depth.

Feature Summary

• Provides effective electromagnetic interference suppression through high impedance characteristics at specific frequencies.
• Designed with a closed-loop toroidal geometry to contain magnetic fields efficiently.
• Utilizes manganese-zinc ferrite material suitable for common mode noise reduction.

Applications

• Suppression of electromagnetic interference on circular cables
• Common mode noise filtering in electronic assemblies
• EMI mitigation in power supply lines

Procurement Notes

Verify the specific impedance requirements against the datasheet values of 80 ohms at 100 MHz and 40 ohms at 25 MHz. Confirm that the cable diameter fits within the 17.9 mm internal aperture. Ensure the operating environment remains within the specified -25 °C to +60 °C temperature range to maintain material integrity and performance stability.

Selection Notes

Select this component when a snap-on toroidal solution is required for existing cabling without wire termination. The 17.9 mm inner diameter dictates the maximum cable bundle size. Consider the MnZn material composition for lower frequency noise applications compared to NiZn alternatives. Verify spatial constraints against the 42.4 mm outer diameter and 17.5 mm depth dimensions.

Part Context

This part belongs to the KEMET ESD-R Toroidal Cores series, which offers pre-formed ferrite rings for easy installation. These cores are distinct from split-core designs as they require cable insertion before closure. The series provides standardized dimensions for consistent EMI performance across various industrial and commercial electronic applications.

Replacement Considerations

Direct substitutes must match the 17.9 mm internal diameter and similar impedance profiles at 100 MHz. Alternative materials like NiZn may offer higher frequency performance but differ in permeability. Verify mechanical fit and thermal limits before cross-referencing with other manufacturers' toroidal cores.

FAQ

What is the impedance of the ESD-R-38B at 100 MHz?

The impedance is 80 ohms at 100 MHz.

What material is used for the ESD-R-38B core?

The core is constructed from manganese-zinc (MnZn) ferrite material.