## Overview of the ESD-R-47SR-P The **ESD-R-47SR-P** is a high-performance **EMI (Electromagnetic Interference) core** manufactured by KEMET. It belongs to the ESD-R series, which are round cable snap-on or solid cores designed to suppress high-frequency noise in electronic systems. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Material** | Mn-Zn (Manganese-Zinc) | | **Shape** | Round Core (Toroidal/Ring) | | **Outer Diameter (OD)** | Approx. 47.0 mm | | **Inner Diameter (ID)** | Approx. 27.0 mm | | **Thickness (HT)** | Approx. 15.0 mm | | **Primary Function** | High-frequency noise suppression | | **Coating** | Phenolic resin / Plastic Casing (S-P suffix indicates specialized casing) | --- ### 2. Composition and Material Properties The "Mn-Zn" (Manganese-Zinc) ferrite material used in this part is specifically chosen for its magnetic permeability characteristics: * **Impedance Frequency:** Mn-Zn materials are generally effective for noise in the **lower frequency ranges** (typically under 10 MHz to 30 MHz) compared to Ni-Zn (Nickel-Zinc) materials. * **High Permeability:** This allows the core to provide high impedance with fewer wire turns, making it efficient for power lines and signal cables. --- ### 3. Applications and Usage The ESD-R-47SR-P is widely used in industrial and consumer electronics to comply with EMC (Electromagnetic Compatibility) regulations. * **Common Mode Choke:** When a cable is looped through the core, it acts as a common-mode filter, preventing unwanted radiation from leaving the device. * **Typical Systems:** * Consumer electronics (TVs, Audio equipment). * Industrial machinery (Motor drives, PLC systems). * Power supplies (Switching power supplies). * Office automation (Copiers, Printers). --- ### 4. Installation Guidelines To achieve maximum efficiency with the ESD-R-47SR-P, consider the following: 1. **Number of Turns:** Increasing the number of turns (looping the wire through the center multiple times) increases the impedance proportionally to the square of the turns ($Z \propto N^2$). 2. **Placement:** Place the core as close as possible to the noise source or the entry/exit point of the enclosure. 3. **Cable Fit:** Ensure the cable fits snugly within the 27mm inner diameter to maximize the magnetic coupling. ---