The **HCM1305-R33-R** is a high-current, automotive-grade power inductor manufactured by Eaton (formerly Bussmann). It is part of the HCM series, known for its high power density and low core losses. --- ### ## Technical Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.33 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 35.0 Amps | | **Saturation Current (Isat)** | 55.0 Amps | | **DC Resistance (DCR)** | 1.10 mΩ (Typical) | | **Operating Temperature** | -55°C to +125°C | | **Package / Case** | 13.8mm x 12.5mm x 5.0mm | --- ### ### Key Features and Composition 1. **Construction**: It is a surface-mount (SMD) inductor featuring a **molded iron powder** core. This construction provides "soft saturation," meaning the inductance drops gradually rather than sharply when current increases. 2. **Magnetically Shielded**: The design minimizes electromagnetic interference (EMI), which is critical for sensitive surrounding circuits. 3. **Low DCR**: The very low DC resistance (1.1 mΩ) ensures minimal power loss through heat, leading to higher efficiency in power conversion. 4. **AEC-Q200 Grade**: The "HCM" prefix and specific series testing make it suitable for automotive environments (high vibration and thermal cycling). --- ### ### Typical Applications The HCM1305-R33-R is designed for high-current power supplies where space is limited. Common use cases include: * **Voltage Regulator Modules (VRMs)** for CPUs and GPUs. * **DC-DC Converters** in automotive infotainment or engine control units. * **High-current POL (Point-of-Load)** converters. * **Battery powered systems** requiring high efficiency. --- ### ### Part Number Breakdown The part number follows a specific nomenclature: * **HCM**: Series name (High Current Inductor). * **1305**: Dimensions (approx. 13mm footprint, 5mm height). * **R33**: Inductance value (R33 = 0.33 µH). * **-R**: RoHS compliant.