## HCMA1707-4R7-R: Component Analysis The **HCMA1707-4R7-R** is a high-current power inductor manufactured by **Eaton (formerly Coiltronics)**. It is part of the HCMA series, which is specifically designed to meet automotive electronics requirements, characterized by high current handling and excellent thermal stability. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 14.0 Amperes (Typical) | | **Saturation Current (Isat)** | 18.0 Amperes (Typical) | | **DC Resistance (DCR)** | 8.2 mΩ (Typical) | | **Operating Temperature** | -55°C to +155°C | | **Package Size** | 1707 (Approx. 17.5 x 17.2 x 7.0 mm) | | **Core Material** | Powder Iron (Molded) | --- ### 2. Key Features and Construction The "Electronic Parts" composition of this inductor involves advanced materials science to ensure reliability in harsh environments: * **Molded Construction:** The coil is encapsulated in a magnetic metal powder iron core. This "pressed" design minimizes acoustic noise and provides a magnetic shield to reduce Electromagnetic Interference (EMI). * **High Temperature Stability:** Unlike standard commercial inductors, this part is **AEC-Q200 Grade 1 qualified**, meaning it can withstand the extreme heat found in automotive engine compartments. * **Soft Saturation:** The powder core provides a "soft" saturation characteristic, meaning the inductance drops gradually as current increases, rather than crashing abruptly. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying equivalent parts: | Code | Meaning | | :--- | :--- | | **HCMA** | Automotive High Current Series | | **1707** | Dimensions (17mm length, 7.0mm height) | | **4R7** | Inductance value (4.7 µH) | | **-R** | RoHS Compliant | --- ### 4. Typical Applications This component is primarily used in power conversion circuits where high efficiency and high current are required: * **Automotive:** LED lighting, ECU (Engine Control Units), and Infotainment power supplies. * **Industrial:** High-current DC-DC converters and Point-of-Load (POL) modules. * **Computing:** Voltage Regulator Modules (VRMs) for multi-phase servers. --- ### 5. Footprint (Mechanical Layout) If you are designing a PCB (Printed Circuit Board), the land pattern should account for the large solder pads to handle the 14A+ current: ```markdown Dimension | mm (nominal) -------------|------------- Length (L) | 17.5 mm Width (W) | 17.2 mm Height (H) | 7.0 mm ```