The **HCM1A1104V2-R56-R** is a high-current, molded power inductor manufactured by Eaton (formerly Bussmann). It is designed specifically for automotive and high-reliability industrial applications. ### 1. Technical Specifications The part number follows a specific nomenclature that defines its physical and electrical characteristics. | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.56 µH (R56) | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 32 Amps (Typical) | | **Saturation Current (Isat)** | 40 Amps (Typical) | | **DC Resistance (DCR)** | 1.6 mΩ (Typical) / 1.8 mΩ (Maximum) | | **Operating Temperature** | -55°C to +155°C | | **Package Size** | 1104 (approx. 11.5mm x 10.3mm x 4.0mm) | --- ### 2. Key Features * **AEC-Q200 Qualified:** Grade 1 certified, making it suitable for automotive "under the hood" environments. * **Molded Construction:** The core is made of a carbonyl iron powder material molded around the copper winding. This provides: * **Magnetic Shielding:** Reduces Electromagnetic Interference (EMI). * **High Saturation:** It handles high current peaks without a sharp drop in inductance. * **Low Buzz Noise:** The solid structure minimizes acoustic noise caused by magnetostriction. * **Thermal Stability:** Designed to operate in high-temperature environments (up to 155°C including self-heating). --- ### 3. Common Applications Due to its high current handling and low profile, it is typically used in DC-DC converters and power modules for: 1. **Automotive Systems:** ADAS (Advanced Driver Assistance Systems), infotainment, and Engine Control Units (ECUs). 2. **Industrial Electronics:** High-current power supplies and ruggedized distributed power systems. 3. **Computing:** Voltage Regulator Modules (VRMs) for multi-phase POL (Point of Load) converters. --- ### 4. Part Number Breakdown ```text HCM1A 1104 V2 - R56 - R | | | | | | | | | +-- RoHS Compliant | | | +---------- Inductance Value (R56 = 0.56µH) | | +----------------- Version/Internal Code | +---------------------- Size Code (Dimensions) +----------------------------- Product Series (Automotive Grade) ```