The **HCMA1707-470-R** is a high-current power inductor designed by Eaton (formerly Bussmann). It belongs to the **HCMA** series, which is specifically engineered for automotive electronics and high-power industrial applications. --- ## 1. Core Technical Specifications The part number follows a specific nomenclature that defines its electrical properties: | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 47 $\mu$H | The nominal inductance at 100 kHz. | | **Tolerance** | ±20% | The allowable variance in inductance value. | | **Inductance Code** | 470 | Standard EIA code ($47 \times 10^0$). | | **Max DC Resistance (DCR)** | 60.1 m$\Omega$ | Resistance of the wire; lower is better for efficiency. | | **Rated Current ($I_{rms}$)** | 6.5 A | Current that causes a 40°C temperature rise. | | **Saturation Current ($I_{sat}$)** | 7.0 A | Current at which inductance drops by 20%. | --- ## 2. Key Physical Features The "1707" in the part number refers to the physical dimensions of the component. * **Form Factor:** Surface Mount Device (SMD). * **Dimensions:** Approximately **17.5mm x 17.2mm** with a height of **7.0mm**. * **Material:** It uses a molded powder iron core technology. * **Shielding:** Magnetically shielded construction, which minimizes Electromagnetic Interference (EMI) with surrounding components. --- ## 3. Applications and Industry Standards This component is built to survive harsh environments, making it ideal for the following: ### Automotive Grade * **AEC-Q200 Qualified:** It meets the stress test qualification for automotive electronics (Grade 3 or higher depending on the specific batch). * **Operating Temperature:** Typically rated from **-55°C to +125°C**. ### Common Use Cases * **DC-DC Converters:** Used in voltage regulation modules (VRMs). * **Infotainment Systems:** Filtering noise in car audio and display units. * **Engine Control Units (ECU):** Handling high-current power management. * **LED Lighting:** Used in driver circuits for automotive headlights. --- ## 4. Advantages 1. **High Power Density:** Large current handling capability relative to its physical footprint. 2. **Low Core Loss:** Optimized for high-frequency switching power supplies. 3. **Soft Saturation:** The inductance decreases gradually as current increases, rather than dropping off sharply, which improves circuit stability.