The **SD10-101-R** is a high-frequency, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is part of the SD10 series, designed primarily for surface-mount (SMT) applications where space is limited. ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the SD10-101-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 100 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 1.146 Ω (Typical) | | **Saturation Current ($I_{sat}$)** | 0.284 A | | **RMS Current ($I_{rms}$)** | 0.354 A | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | 5.2 x 5.2 x 1.0 mm | --- ### 2. Detailed Component Breakdown #### A. Ferrite Core Construction The device uses a **ferrite drum core** construction. Ferrite is used because it provides high magnetic permeability with low electrical conductivity, which minimizes eddy current losses at high frequencies. The "SD" in the part number stands for **Shielded**, meaning the magnetic field is contained, reducing Electro-Magnetic Interference (EMI) with neighboring components. #### B. The "101" and "-R" Naming Convention * **101:** This represents the inductance value in microhenries (µH). The first two digits (10) are the significant figures, and the third digit (1) is the multiplier ($10 \times 10^1 = 100$). * **-R:** This suffix indicates that the part is **RoHS compliant**, meaning it is manufactured without hazardous substances like lead. #### C. Power Handling * **Saturation Current ($I_{sat}$):** This is the point where the inductance drops by a specific percentage (usually 30%) because the core cannot hold more magnetic flux. At ~284mA, this inductor is suited for low-power signal conditioning or small DC-DC converters. * **Heating Current ($I_{rms}$):** This defines the continuous current that will cause a 40°C temperature rise in the part. --- ### 3. Common Applications The SD10-101-R is commonly found in portable electronics due to its extremely low profile (only 1.0 mm high). 1. **DC-DC Converters:** Used in "Buck" or "Boost" regulators to store energy. 2. **Battery Powered Devices:** Ideal for smartphones, tablets, and wearables. 3. **Filter Inductors:** Used in LC filters to smooth out ripple voltage in power supplies. 4. **LED Drivers:** Providing constant current for small backlighting arrays. --- ### 4. Footprint and Mounting The device is a **Surface Mount Device (SMD)**. It features two metallic pads on the bottom for soldering. Because it is magnetically shielded, it can be placed closer to sensitive components than unshielded inductors without causing significant noise interference.