The **SD12-471-R** is a low-profile, shielded surface-mount (SMD) power inductor manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the SD12 series, designed for applications where space is limited and electromagnetic interference (EMI) must be minimized. --- ### 1. Technical Specifications The part number itself contains encoded information about its electrical characteristics. | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 470 µH | The "471" indicates 47 followed by one zero. | | **Tolerance** | ±20% | Standard for the SD series. | | **DC Resistance (DCR)** | 8.16 Ω (Typ) | The internal resistance of the copper winding. | | **Isat (Saturation Current)** | 0.138 A | The current at which inductance drops by 30%. | | **Irms (Rated Current)** | 0.201 A | The current that causes a 40°C temperature rise. | | **Shielding** | Yes | Ferrite drum and sleeve construction. | --- ### 2. Key Features * **Magnetically Shielded:** The inductor is enclosed in a ferrite core, which contains the magnetic flux. This prevents the component from interfering with nearby sensitive components and reduces audible noise. * **Low Profile:** The "12" in the name refers to its height (approx. 1.2mm), making it ideal for ultra-thin electronics like smartphones or wearables. * **Ferrite Core Material:** Ensures high efficiency and low core losses at high switching frequencies. * **RoHS Compliant:** The "-R" suffix indicates the part is lead-free and meets environmental standards. --- ### 3. Application Use Cases This specific inductor is typically found in DC-DC converter circuits. Because of its high inductance (470 µH) and relatively low current rating, it is best suited for: * **Battery Powered Devices:** IoT sensors, handheld medical devices, and portable media players. * **Buck/Boost Converters:** Used for voltage regulation in low-power circuits. * **EL Backlighting:** Driving small displays. * **Filtering:** Acting as a choke to remove high-frequency noise from power lines. --- ### 4. Dimensional Data | Dimension | Measurement | | :--- | :--- | | **Length/Width** | 5.2 mm x 5.2 mm | | **Height** | 1.2 mm (Max) | | **Footprint** | SMD (Surface Mount Device) |