The part number **48NDR-2R5-R** refers to a high-performance **common mode choke** (inductor), typically manufactured by companies like **Coiltronics (now part of Eaton)**. These components are essential for noise suppression in electronic circuits. --- ## 1. Component Overview The NDR series is designed for surface-mount applications where electromagnetic interference (EMI) filtering is required. It is specifically built to handle high currents while maintaining a low profile. ### Technical Specifications | Parameter | Typical Value | | :--- | :--- | | **Inductance** | 2.5 µH | | **Current Rating** | High (typically used in 10A-30A ranges) | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Core Material** | Ferrite / Powder Iron | | **Configuration** | Dual Winding (Common Mode) | --- ## 2. Key Features * **Common Mode Noise Suppression:** Designed to filter out high-frequency noise that is common to both power/signal lines while allowing the desired signal to pass. * **Low DCR (DC Resistance):** This ensures minimal power loss and heat generation, making it efficient for power supplies. * **Compact Footprint:** The "NDR" series is known for a robust mechanical design that fits into tight PCB layouts. * **RoHS Compliant:** The "-R" suffix indicates that the part is Lead-Free and RoHS compliant. --- ## 3. Common Applications These parts are widely used in power electronics to ensure regulatory compliance (EMC/EMI standards): 1. **DC-DC Converters:** Filtering input/output noise to prevent interference with other sensitive components. 2. **Industrial Controls:** Protecting circuitry from harsh electrical environments. 3. **Battery Management Systems (BMS):** Cleaning up signals in high-current charging environments. 4. **Telecommunications:** Ensuring signal integrity in high-speed data transmission equipment. --- ## 4. Internal Schematic The device consists of two coils wound on a single core: ```text Line In (1) --- [ Coil A ] --- (2) Line Out Neutral (4) --- [ Coil B ] --- (3) Neutral Out ``` *When current flows in the same direction (Common Mode), the magnetic fields add up, creating high impedance to block the noise.* ---