The **HCMA0703-3R3-R** is a high-current power inductor manufactured by Eaton (formerly Bussmann). It is specifically designed for automotive applications and high-frequency DC-DC converters. --- ### 1. Key Technical Specifications The part number itself contains specific data regarding its dimensions and inductance value. | Parameter | Specification | | :--- | :--- | | **Inductance** | 3.3 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 6.0 Amps | | **Saturation Current (Isat)** | 8.5 Amps | | **DC Resistance (DCR)** | 23.5 mΩ (Typical) | | **Operating Temperature** | -55°C to +125°C | | **Package Size** | 7.4mm x 7.0mm x 3.0mm | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying variants within the same series: * **HCMA**: High Current Automotive (Series name). * **0703**: Physical dimensions (approx. 7mm length/width, 3mm height). * **3R3**: Inductance value (3.3 microhenries). * **R**: RoHS compliant. --- ### 3. Core Technologies and Features The HCMA0703 series utilizes advanced construction methods to handle high power in a small footprint: * **Powder Iron Core:** It uses a molded iron powder core technology. This provides a "soft saturation" characteristic, meaning the inductance drops gradually rather than sharply when the current increases. * **Magnetic Shielding:** The construction is naturally shielded, which minimizes Electromagnetic Interference (EMI) with surrounding components. * **AEC-Q200 Grade 1:** This part is automotive qualified, meaning it has passed rigorous mechanical and thermal stress tests. --- ### 4. Common Applications Due to its robust thermal performance and high current handling, it is typically found in: 1. **Automotive Electronics:** Advanced Driver Assistance Systems (ADAS), infotainment, and LED lighting modules. 2. **Voltage Regulator Modules (VRM):** DC-DC converters for CPUs and GPUs. 3. **Industrial Power Supplies:** High-density power conversion where space is limited. --- ### 5. Footprint (Solder Pad Layout) Below is a representation of the typical landing pattern for this surface-mount device (SMD): ```text 7.4mm (Inductor Body) <----------------------> ________________________ | (A) (A) | (A) Terminal pads | [---] [---] | |________________________| Pad Width: ~2.2mm Pad Length: ~1.5mm ```