## HCMA1104-3R3-R Technical Overview The **HCMA1104-3R3-R** is a high-current power inductor designed specifically for automotive and harsh environment applications. It belongs to the HCMA series manufactured by **Eaton (formerly Bussmann)**. ### 1. Key Technical Specifications | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 3.3 µH | Nominal inductance at 100 kHz | | **Tolerance** | ±20% | Standard variance | | **Current Rating (Irms)** | 10.0 A | Continuous RMS current (based on temp rise) | | **Saturation Current (Isat)** | 14.0 A | Current at which inductance drops ~20% | | **DCR (Max)** | 10.8 mΩ | DC Resistance at 20°C | | **Operating Temp** | -55°C to +125°C | Range including self-heating | | **Package Size** | 1104 | Approx. 11.5mm x 10.3mm x 4.0mm | --- ### 2. Core Features and Construction * **AEC-Q200 Qualified:** This is a critical rating for automotive use, meaning the part has passed rigorous stress tests for mechanical shock, vibration, and thermal cycling. * **Magnetic Shielding:** The part is constructed using a molded iron powder core. This provides high "soft" saturation and minimizes Electromagnetic Interference (EMI) with surrounding components. * **High Efficiency:** With a low DC Resistance (DCR), the component minimizes power loss through heat, making it suitable for high-density power supplies. * **Rugged Design:** The "1104" size indicates a large footprint capable of handling significant thermal dissipation. --- ### 3. Common Applications This inductor is typically used in DC-DC converters and power management modules where reliability is paramount. 1. **Automotive Systems:** * Advanced Driver Assistance Systems (ADAS). * Infotainment and Navigation units. * LED Lighting drivers. 2. **Industrial Electronics:** * Multi-phase regulators. * Battery-powered equipment. 3. **Computing:** * Voltage Regulator Modules (VRMs) for servers. --- ### 4. Part Number Breakdown The part number follows a specific nomenclature: * **HCMA:** Series Name (High Current Automotive). * **1104:** Physical size (Length/Width and Height). * **3R3:** Inductance value (3.3 µH; 'R' acts as the decimal). * **-R:** RoHS compliant. ---