## HCMA0703-4R7-R: Component Overview The **HCMA0703-4R7-R** is a high-current, automotive-grade power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the HCMA series, which is specifically designed to handle high power density and provide high reliability in harsh environments. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the component: | Property | Value | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 6.0 Amps | | **Saturation Current (Isat)** | 8.2 Amps | | **DC Resistance (DCR)** | 30.0 mΩ (Typical) | | **Operating Temperature** | -55°C to +125°C | | **Package Size** | 0703 (approx. 7.4 x 7.0 x 3.0 mm) | | **AEC-Q200 Qualified** | Yes (Grade 1) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **HCMA**: Series Name (High Current Automotive Inductor). * **0703**: Physical size (7.4mm length x 7.0mm width x 3.0mm height). * **4R7**: Inductance value (4.7 microhenries). The 'R' acts as a decimal point. * **-R**: RoHS compliant. --- ### 3. Key Features and Construction * **Pressed Powder Iron Core:** The inductor uses a magnetic metal powder core. This construction allows for "soft saturation," meaning the inductance drops gradually as current increases rather than crashing abruptly. * **Magnetic Shielding:** The molded construction provides excellent EMI (Electromagnetic Interference) shielding, which is critical for noise-sensitive automotive electronics. * **High Reliability:** Designed to withstand high vibration and thermal shock, meeting the AEC-Q200 stress test qualifications. --- ### 4. Typical Applications This part is commonly found in DC-DC converters and power management modules for: 1. **Automotive Systems:** ADAS, Infotainment, and ECU power supplies. 2. **Industrial Electronics:** High-density power supplies and battery-powered devices. 3. **Computing:** Voltage Regulator Modules (VRMs) and distributed power systems. --- ### 5. Footprint (Mechanical Data) ```text [ 7.4mm ] +-------------+ --- | | ^ | (4R7) | 7.0mm | | v +-------------+ --- (Top View) ```