The **DR124-R47-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by Eaton (formerly Bussmann). It belongs to the DR series, which is known for its high power density and drum core construction. --- ### 1. Technical Specifications The part number "R47" specifically identifies the inductance value. Below are the primary electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 4.8 mΩ (Max) | | **Rated Current (Irms)** | 14.8 Amps | | **Saturation Current (Isat)** | 23.5 Amps | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | --- ### 2. Physical Characteristics The "124" in the series name refers to the physical dimensions of the component. * **Size (Footprint):** Approximately 12.5mm x 12.5mm. * **Height:** 4.5mm (Maximum). * **Construction:** Ferrite drum core with a ferrite sleeve (shield) to minimize Electromagnetic Interference (EMI). * **Termination:** Matte Tin over Copper, suitable for lead-free reflow soldering. --- ### 3. Key Features & Applications #### Features * **High Saturation Current:** It can handle large current spikes without the inductance dropping significantly. * **Low DCR:** The low DC resistance minimizes power loss and heat generation. * **Magnetic Shielding:** Essential for high-density boards where nearby components are sensitive to magnetic fields. #### Common Applications 1. **DC-DC Converters:** Used in buck, boost, and SEPIC converters. 2. **Voltage Regulator Modules (VRMs):** Found in computer motherboards and servers. 3. **Industrial Power Supplies:** Suitable for high-current power distribution. 4. **Telecommunications:** Used in base stations and networking hardware. --- ### 4. Part Number Breakdown * **DR:** Series Prefix (Drum Core). * **124:** Size code (12.5 x 12.5 x 4.5 mm). * **R47:** Inductance value (R = decimal point; 0.47 microhenries). * **-R:** RoHS compliant (Lead-free).