The **HCM1A1104V2-R20-R** is a high-current, power inductor belonging to the HCM1A series manufactured by **Eaton (formerly Coiltronics)**. It is specifically designed for automotive applications and high-reliability industrial power conversion. --- ### 1. Key Technical Specifications The part number itself acts as a code for its primary specifications: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 0.20 µH | Rated at 100 kHz, 0.1 Vrms | | **Tolerance** | ±20% | Standard deviation for power inductors | | **DC Resistance (DCR)** | 0.65 mΩ (Typ) | Extremely low resistance to minimize power loss | | **Irms (Rated Current)** | 40 A | Current that causes a 40°C temperature rise | | **Isat (Saturation Current)** | 75 A | Current at which inductance drops by ~20% | | **Operating Temp** | -55°C to +155°C | High-temperature grade for engine compartments | --- ### 2. Physical Characteristics The "1104" in the part number refers to the physical dimensions of the component. * **Footprint:** Approximately 11.5 mm x 10.3 mm. * **Height:** 4.0 mm (Max). * **Construction:** Molded magnetic powder iron core. * **Terminations:** Lead-free, tin-plated copper (RoHS compliant). --- ### 3. Core Features & Benefits * **AEC-Q200 Qualified:** This is the most critical feature for automotive use, ensuring the part can withstand extreme vibration, mechanical shock, and thermal cycling. * **Low EMI:** The molded construction provides "self-shielding," which reduces electromagnetic interference with surrounding sensitive circuits. * **High Current Density:** Due to its low DCR and high saturation levels, it handles large power loads in a relatively small surface-mount (SMD) package. * **Soft Saturation:** Unlike ferrite cores that lose inductance sharply, this metal powder core has a "soft" saturation curve, making the circuit more stable during current spikes. --- ### 4. Typical Applications The HCM1A1104V2-R20-R is primarily used as an energy storage element or filter in: 1. **Automotive DC-DC Converters:** Powering ECUs (Engine Control Units), ADAS sensors, and Infotainment systems. 2. **Voltage Regulator Modules (VRM):** High-speed switching power supplies for CPUs/GPUs. 3. **Battery Management Systems (BMS):** Filtering noise in high-current battery lines. 4. **Industrial Automation:** Heavy-duty power modules requiring high thermal stability. ---