The **HCMA1104-R45-R** is a high-current, automotive-grade power inductor manufactured by Eaton (formerly Bussmann). It belongs to the HCMA series, designed to meet the rigorous demands of automotive electronics. --- ### 1. Technical Specifications Below are the key electrical and physical characteristics of the HCMA1104-R45-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.45 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 29 Amps | | **Saturation Current (Isat)** | 45 Amps | | **DC Resistance (DCR)** | 1.35 mΩ (Typical) | | **Operating Temperature** | -55°C to +125°C | | **Package Size** | 1104 (approx. 11.5mm x 10.0mm x 4.0mm) | | **Compliance** | AEC-Q200 Grade 1 | --- ### 2. Core Features & Construction * **Powder Iron Core:** The part uses a molded iron powder core technology. This provides a "soft" saturation characteristic, meaning the inductance drops gradually as current increases rather than failing abruptly. * **Magnetic Shielding:** The molded construction inherently provides magnetic shielding, which minimizes Electromagnetic Interference (EMI) with surrounding components. * **High Current Density:** Due to its very low DCR (1.35 mΩ), it can handle significant current with minimal power loss and heat generation. * **Ruggedness:** It is designed to withstand high vibration and thermal shock, meeting the AEC-Q200 standards required for under-the-hood automotive applications. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **HCMA** | Product Family (High Current Automotive Inductor) | | **1104** | Size Code (11mm length, 4mm height) | | **R45** | Inductance Value (R45 = 0.45 µH) | | **-R** | RoHS Compliant / Lead-Free | --- ### 4. Common Applications This inductor is typically used in DC-DC converters and voltage regulator modules (VRMs) for: * **Automotive Systems:** ADAS (Advanced Driver Assistance Systems), infotainment, and body electronics. * **Power Supplies:** High-efficiency POL (Point-of-Load) converters. * **Industrial:** High-current battery powered systems and ruggedized motor controllers.