The **MA7HFBD-R** is a specific part number belonging to the **MA series** of Miniature High-Performance Power Inductors, typically manufactured by **Eaton (formerly Coiltronics)**. These components are designed for high-current power applications where space is limited. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical characteristics. | Feature | Specification | Description | | :--- | :--- | :--- | | **Inductance** | 0.47 µH to 1.0 µH (Series dependent) | Low inductance for high-frequency switching. | | **Current Rating** | High (Up to 15A+) | Designed for significant DC current without saturation. | | **Material** | Metal Composite | Powdered iron core for soft saturation. | | **Shielding** | Magnetically Shielded | Reduces Electromagnetic Interference (EMI). | | **Mounting** | Surface Mount (SMD) | Optimized for automated PCB assembly. | | **RoHS** | Compliant (-R suffix) | Lead-free and environmentally friendly. | --- ### 2. Physical Characteristics The "MA" designation refers to the ultra-miniature molded construction. * **Construction:** The coil is embedded in a metal powder resin, which provides high power density and a robust structure. * **Size:** Usually features a small footprint (e.g., 2.5mm x 2.0mm or 3.2mm x 2.5mm), making it ideal for mobile devices. * **Termination:** Tin-plated copper leads for excellent solderability. --- ### 3. Common Applications These inductors are found in circuits requiring efficient voltage regulation and high power delivery in small form factors: 1. **DC-DC Converters:** Used in Point-of-Load (POL) modules. 2. **Mobile Electronics:** Smartphones, tablets, and wearable devices. 3. **Computing:** Laptops, SSDs, and graphics cards (GPU power stages). 4. **IoT Devices:** Battery-powered sensors requiring efficient power management. --- ### 4. Part Number Breakdown While manufacturer codes vary slightly, the breakdown for this series generally follows this logic: * **MA:** Series Name (Molded Alloy). * **7H:** Height/Size code (e.g., 0.7mm to 1.2mm height). * **FBD:** Internal material/Performance characteristic code. * **-R:** RoHS compliant indicator. --- ### 5. Key Advantages * **Soft Saturation:** Unlike ferrite cores that drop inductance sharply at high currents, the metal composite core loses inductance gradually. * **Low DCR:** Low Direct Current Resistance minimizes power loss and heat generation. * **Low Buzz Noise:** The molded construction minimizes audible noise caused by vibration.