The **SD20-102-R** is a high-power density, low-profile power inductor manufactured by **Eaton (formerly Coiltronics/Bussmann)**. It belongs to the SD20 series, which is designed for applications requiring compact footprints and high efficiency. --- ### 1. Key Technical Specifications The part number "102" indicates the inductance value, and "R" signifies RoHS compliance. | Parameter | Value | | :--- | :--- | | **Inductance** | 1.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.035 Ω (Typical) | | **Rated Current (Irms)** | 2.53 Amps | | **Saturation Current (Isat)** | 3.32 Amps | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 5.2mm x 5.2mm x 2.0mm | --- ### 2. Physical & Material Construction * **Shielding:** It is a **magnetically shielded** inductor. This minimizes Electromagnetic Interference (EMI), making it ideal for densely packed circuit boards where noise could affect nearby components. * **Core Material:** Ferrite core, which provides high efficiency and low core losses at high frequencies. * **Form Factor:** Surface Mount Device (SMD). The "20" in the series name refers to the maximum height of 2.0mm. --- ### 3. Application Use Cases The SD20-102-R is typically found in power management circuits where space is a premium: 1. **DC-DC Converters:** Used as a storage inductor in buck (step-down), boost (step-up), and SEPIC converters. 2. **Portable Electronics:** Common in smartphones, tablets, and handheld GPS units due to its low profile. 3. **Computer Peripherals:** Used in local card power supplies and SSDs. 4. **LED Drivers:** Providing stable current for lighting applications. --- ### 4. Performance Characteristics * **Saturation Current ($I_{sat}$):** This is the current level at which the inductance drops by a specified percentage (usually 30%). At 3.32A, this inductor can handle significant spikes before losing its effectiveness. * **Heating Current ($I_{rms}$):** This indicates the continuous current that will cause a 40°C temperature rise. In this case, 2.53A is the thermal limit for safe continuous operation. ---