Based on your query, it appears you are referring to the **SDR10 (SDR1005/SDR1006)** series of Surface Mount Device (SMD) Power Inductors, which are commonly found in the electronics market (often misread or labeled with specific suffixes like KSMS in certain inventory systems). Below is a technical breakdown of the electronic characteristics and parts of these components. --- ### 1. Component Overview The SDR series consists of **Non-Shielded SMD Power Inductors**. These are designed for applications requiring high saturation current and compact form factors. | Feature | Specification Details | | :--- | :--- | | **Core Material** | Ferrite DR Core | | **Wire Type** | Enameled Copper Wire | | **Terminations** | Lead-free (Sn/Ag/Cu) | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temp** | -40 °C to +125 °C | --- ### 2. Key Electronic Characteristics When analyzing an SDR10 series part, four electrical parameters define its performance: #### A. Inductance Range Typically ranges from **1.0 µH to 10,000 µH**. The "10" in the name usually refers to the physical size (approx. 10mm diameter). #### B. DC Resistance (DCR) The internal resistance of the copper winding. Lower DCR is preferred to minimize power loss and heat generation. #### C. Rated Current ($I_{dc}$) The amount of direct current the inductor can handle before the temperature rises by a specific amount (usually 40°C). #### D. Saturation Current ($I_{sat}$) The current level at which the inductance drops by a specific percentage (usually 10% or 25%) due to the ferrite core reaching its magnetic limit. --- ### 3. Structural Components An SDR10 series inductor is composed of three primary physical parts: 1. **Ferrite Core:** A "drum" shaped (DR) core that provides the magnetic path. Being non-shielded, the magnetic field is partially external. 2. **Winding:** Precision-wound copper wire around the core. The number of turns determines the inductance value. 3. **Solder Pads:** Located at the base of the core, these allow the component to be reflow-soldered onto a PCB. --- ### 4. Typical Applications These parts are used in power management circuits where space is a premium but high power is required: * **DC-DC Converters:** Buck, Boost, and SEPIC converters. * **Power Supplies:** For portable electronics, laptops, and LED lighting. * **Filtering:** Decoupling and noise suppression in power lines. ---