### SDR2207-R78ML Component Overview The **SDR2207-R78ML** is a high-power, surface-mount (SMD) wirewound inductor manufactured by **Bourns**. It is designed specifically for power electronic applications that require high current handling and reliability in a compact form factor. --- ### Technical Specifications The following table outlines the primary electrical and physical characteristics of the SDR2207-R78ML: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.78 µH | | **Tolerance** | ±20% (M) | | **DC Resistance (DCR)** | 2.6 mΩ (Max) | | **Saturation Current (Isat)** | 28.0 A | | **Heating Current (Irms)** | 14.5 A | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 22.0 x 15.0 x 7.0 mm | --- ### Key Internal Parts and Construction 1. **Core Material:** * It typically utilizes a **Ferrite core**. Ferrite provides high magnetic permeability while maintaining low eddy current losses, which is essential for efficiency in switching power supplies. 2. **Winding:** * It features a **Wirewound** construction using heavy-gauge enameled copper wire. This allows for a very low DC resistance (DCR), which minimizes heat generation during high-current operation. 3. **Terminations:** * The part uses **Lead-free (RoHS compliant)** tin-plated terminals. These are designed for robust solder joints in surface-mount technology (SMT) assembly processes. 4. **Shielding:** * The SDR2207 series is generally **unshielded**. While this allows for higher saturation currents in a smaller footprint, designers must be mindful of potential electromagnetic interference (EMI) to neighboring components. --- ### Applications Because of its high saturation current and low resistance, this part is commonly found in: * **DC-DC Converters:** Used as an output filter inductor. * **Power Supplies:** Common in laptop adapters and industrial power modules. * **Input/Output Filters:** Used for smoothing current ripples. --- ### Identification Breakdown: `SDR2207-R78ML` | Segment | Meaning | | :--- | :--- | | **SDR** | Series Name (SMD Power Inductor) | | **2207** | Dimensions (Approx. 22mm x 7mm height) | | **R78** | Inductance Value (R denotes decimal point: 0.78µH) | | **M** | Tolerance (M = ±20%) | | **L** | Compliance (L = RoHS Compliant / Lead-Free) |