## Technical Overview: DR124-470-R The **DR124-470-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is part of the DR series, known for high efficiency and high power density. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 47 $\mu$H | | **Tolerance** | ±20% | | **Current Rating (Saturation)** | 2.58 A (Typ. $I_{sat}$) | | **Current Rating (RMS)** | 2.27 A (Typ. $I_{rms}$) | | **DC Resistance (DCR)** | 101 mΩ (Max) | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | 12.5mm x 12.5mm x 4.5mm | --- ### 2. Breakdown of the Part Number The alphanumeric code follows a specific naming convention: * **DR:** Series name (Drum Core/High Power). * **124:** Indicates the physical size (approx. 12.5mm width and 4.5mm height). * **470:** The inductance value. The first two digits (47) are the value, and the third (0) is the multiplier. $47 \times 10^0 = 47 \mu$H. * **R:** Denotes RoHS compliance (lead-free). --- ### 3. Core Features and Construction * **Magnetically Shielded:** The part is enclosed in a ferrite core. This minimizes Electromagnetic Interference (EMI), making it suitable for densely packed circuit boards where components are close to sensitive signals. * **Ferrite Drum Core:** Uses a high-permeability ferrite material that allows for high saturation current levels relative to its size. * **Low Core Loss:** Designed for high-frequency applications, minimizing energy wasted as heat. --- ### 4. Common Applications This inductor is typically found in power management circuits, specifically: 1. **DC-DC Converters:** Used in Buck, Boost, and SEPIC topologies. 2. **Point of Load (POL):** Providing stable voltage to CPUs, FPGAs, and ASICs. 3. **Industrial Electronics:** Power supplies for LED lighting, motor controls, and sensors. 4. **Consumer Electronics:** Laptops, servers, and telecommunications equipment. --- ### 5. Design Considerations * **Saturation Current ($I_{sat}$):** This is the point where inductance drops by a specific percentage (usually 30%). Do not exceed this current, or the inductor will lose its ability to store energy. * **Thermal Management:** The $I_{rms}$ rating is based on a 40°C temperature rise. Ensure adequate airflow or PCB copper traces for heat dissipation.