## Technical Overview: HCMA1707-330-R Inductor The **HCMA1707-330-R** is a high-current, automotive-grade power inductor manufactured by **Eaton (Bussmann Division)**. It belongs to the HCMA series, which is specifically designed to meet the rigorous demands of automotive electronics, particularly in high-temperature and high-vibration environments. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 33 $\mu$H | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 6.2 Amperes | | **Saturation Current (Isat)** | 7.0 Amperes | | **DC Resistance (DCR)** | 48.0 mΩ (Typical) | | **Operating Temperature** | -55°C to +155°C | | **Dimensions (L x W x H)** | 17.5mm x 17.2mm x 7.0mm | | **AEC-Q200 Qualified** | Yes (Grade 1) | --- ### 2. Core Material and Construction * **Iron Powder Core:** The inductor utilizes an advanced iron powder core material. This provides a "soft" saturation characteristic, meaning the inductance drops gradually as current increases rather than hitting a sharp "cliff." * **Magnetically Shielded:** The molded construction provides excellent EMI (Electromagnetic Interference) shielding, which is critical for sensitive automotive circuits like ADAS or Infotainment systems. * **Rugged Design:** The 1707 package size is large and robust, designed to handle high mechanical shock and vibration. --- ### 3. Applications Due to its high temperature rating and AEC-Q200 qualification, the HCMA1707-330-R is commonly used in: * **Automotive Power Units:** DC-DC converters for engine control units (ECU). * **Body Electronics:** Lighting systems (LED drivers) and heating/ventilation controls. * **Safety Systems:** Adaptive cruise control and braking modules. * **Industrial Power:** High-density power supplies where heat dissipation is a concern. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: 1. **HCMA:** Series identifier (High Current Automotive). 2. **1707:** Physical size (approx. 17mm x 7mm height). 3. **330:** Inductance code ($33 \times 10^0$ = 33 $\mu$H). 4. **-R:** RoHS compliant. ---