The **SD52-220-R** is a high-performance, low-profile, shielded surface mount (SMD) power inductor. It is part of the SD52 series manufactured by Eaton (formerly Coiltronics). --- ### 1. Key Technical Specifications The part number "SD52-220-R" provides specific data about its electrical characteristics: | Parameter | Value | Notes | | :--- | :--- | :--- | | **Inductance** | 22.0 µH | Measured at 100 kHz, 0.25 Vrms | | **Tolerance** | ±20% | Standard for power inductors | | **DCR (Direct Current Resistance)** | 0.176 Ω | Typical resistance of the internal coil | | **Irms (Rated Current)** | 1.12 Amps | Based on a 40°C temperature rise | | **Isat (Saturation Current)** | 0.88 Amps | Point where inductance drops by 30% | | **Shielding** | Yes | Ferrite drum core with integrated shield | | **Dimensions** | 5.2 x 5.2 x 2.0 mm | Compact square footprint | --- ### 2. Design and Construction The SD52-220-R is engineered for modern high-density electronics: * **Shielded Construction:** The magnetic field is contained within the component. This reduces **Electro-Magnetic Interference (EMI)**, allowing it to be placed near sensitive components without causing signal noise. * **Low Profile:** At only 2.0 mm height, it is ideal for thin devices like tablets, smartphones, and portable IoT sensors. * **Ferrite Core:** Utilizes a ferrite material designed for high-frequency switching power supplies (typically up to several MHz). --- ### 3. Common Applications This inductor is primarily used in **DC-DC conversion** circuits. Common use cases include: 1. **Buck Converters:** Stepping down voltage for processors or memory modules. 2. **LED Drivers:** Providing stable current for backlighting or indicators. 3. **Battery Powered Devices:** High efficiency and small size are critical for extending battery life. 4. **Computer Peripherals:** Used in hard drives, solid-state drives (SSDs), and network cards. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in selecting alternatives: `SD` (Series Name) - `52` (Size: 5.2mm) - `220` (Inductance: 22 x 10^0) - `R` (RoHS Compliant) ---