The **THMR1395-R28** is a specific surface-mount (SMD) power inductor, commonly used in automotive and industrial electronic circuits. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. General Specifications The part number follows a specific nomenclature that defines its physical and electrical properties: | Feature | Specification | | :--- | :--- | | **Component Type** | Fixed Power Inductor | | **Inductance** | 0.28 µH (indicated by "R28") | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Core Material** | Composite Metal Powder (High saturation) | | **Shielding** | Magnetically Shielded | ### 2. Key Electronic Parameters This inductor is designed for high-frequency DC-DC converters and high-current power supplies. * **Inductance (L):** **0.28 µH**. This low value is ideal for high-speed switching frequencies (often above 500 kHz to several MHz). * **DC Resistance (DCR):** Typically extremely low (measured in mΩ). This minimizes power loss through heat (I²R losses). * **Saturation Current ($I_{sat}$):** This is the current at which the inductance drops by a specific percentage (usually 20-30%). These parts usually handle very high peaks, often exceeding 30A-50A depending on the specific series frame size. * **Heating Current ($I_{rms}$):** The continuous current that causes a specific temperature rise (usually 40°C). ### 3. Physical Construction The "1395" in the part number usually refers to the **Footprint/Case Size**: * **Dimensions:** Approximately 13.5 mm x 12.5 mm (Length x Width). * **Height:** Roughly 9.5 mm (indicated by the "95"). * **Construction:** Metal composite molding. Unlike traditional wire-wound inductors with ferrite cores, these use a metal powder pressed around the coil, which prevents sudden magnetic saturation (soft saturation characteristics). ### 4. Typical Applications The THMR1395-R28 is used in high-performance power stages: 1. **Voltage Regulator Modules (VRMs):** Found in servers and GPU power stages. 2. **Automotive ECU:** Powering processors in ADAS or infotainment systems (often AEC-Q200 qualified). 3. **DC-DC Buck Converters:** Used as the output filter inductor to smooth current ripple. --- ### Summary of Advantages * **Low Profile:** High current capacity relative to its height. * **Soft Saturation:** It does not "crash" electrically when current spikes occur. * **Shielding:** Low EMI (Electromagnetic Interference) radiation, making it safe for dense PCB layouts near sensitive components.