### Overview of the ESD-R-19D-B The **ESD-R-19D-B** is a high-performance EMI (Electromagnetic Interference) suppression core manufactured by **KEMET**. It belongs to the ESD-R series of round ferrite cores designed for use on round cables to mitigate high-frequency noise. --- ### Technical Specifications The following table outlines the physical and magnetic characteristics of the ESD-R-19D-B: | Parameter | Specification | | :--- | :--- | | **Type** | Round Ferrite Core (Solid) | | **Material** | Manganese-Zinc (MnZn) | | **Outer Diameter (OD)** | 19.0 mm | | **Inner Diameter (ID)** | 9.0 mm | | **Height (H)** | 10.0 mm | | **Impedance (at 100 MHz)** | ~115 $\Omega$ | | **Temperature Range** | -25°C to +85°C | | **Flame Retardancy** | UL94 V-2 (for coated versions) | --- ### Key Features and Electronic Properties 1. **Noise Suppression:** It functions as a low-pass filter. It allows low-frequency signals (DC/60Hz) to pass with minimal attenuation while providing high impedance to high-frequency noise (1MHz to 100MHz+). 2. **MnZn Material Advantage:** The MnZn (Manganese-Zinc) composition is optimized for high-frequency ranges, making it more effective than standard NiZn cores in specific broadband interference scenarios. 3. **Non-Snap-On Design:** Unlike "clamp-on" ferrites, the ESD-R-19D-B is a solid ring. The cable must be threaded through the center during the assembly process. --- ### Typical Applications * **Consumer Electronics:** Televisions, gaming consoles, and audio equipment. * **Industrial Equipment:** Reducing noise in signal lines for PLCs or motor controllers. * **Power Supplies:** Filtering out switching noise from AC/DC adapters. * **Medical Devices:** Ensuring electromagnetic compatibility (EMC) in sensitive diagnostic tools. --- ### Installation Note To increase the effectiveness (impedance) of the core, the cable can be looped through the center multiple times. The impedance increases proportionally to the square of the number of turns ($Z \propto N^2$).