## SD12-102-R Electronic Component Overview The **SD12-102-R** is a low-profile, shielded surface-mount (SMD) power inductor part of the SD series manufactured by **Eaton (formerly Coiltronics)**. It is widely used in power management circuits due to its compact size and high energy storage capabilities. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Inductance** | 1.0 mH (1000 µH) | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 14.8 Ω (Typical) | | **Saturation Current ($I_{sat}$)** | 0.088 Amps (88 mA) | | **RMS Current ($I_{rms}$)** | 0.138 Amps (138 mA) | | **Shielding** | Ferrite core (Shielded) | | **Dimensions** | 5.2mm x 5.2mm x 1.2mm | --- ### 2. Functional Components * **Ferrite Drum Core:** The "102" code signifies high inductance (1.0mH), achieved by using a high-permeability ferrite core. * **Magnetic Shielding:** The "SD" series features a shielded construction, which minimizes Electromagnetic Interference (EMI) by containing the magnetic flux within the component. * **Winding:** Copper wire is wound around the core. In the 102-R model, the wire is very thin to accommodate the high number of turns required for 1mH within a 1.2mm height profile. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and compliant with environmental standards. --- ### 3. Application Use Cases This specific inductor is designed for low-power applications where space is at a premium. 1. **DC-DC Converters:** Used in Buck or Boost regulators to smooth current ripples. 2. **Noise Filtering:** High inductance makes it effective for filtering high-frequency noise in signal lines. 3. **Portable Electronics:** Ideal for smartphones, wearables, and handheld medical devices due to the 1.2mm ultra-low profile. 4. **LED Drivers:** Used in small-scale LED backlighting circuits. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **SD** | Series name (Shielded Drum) | | **12** | Physical size (Approx. 5.2mm x 1.2mm height) | | **102** | Inductance Code (10 followed by 2 zeros = 1000µH or 1mH) | | **-R** | RoHS compliant |