The **HCM1707-470-R** is a high-current, shielded power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the HCM series, which is specifically designed for high-density, high-current power applications. --- ### ## Technical Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 47 $\mu$H | | **Tolerance** | $\pm$ 20% | | **Current Rating (Irms)** | 6.5 A | | **Saturation Current (Isat)** | 8.5 A | | **DC Resistance (DCR)** | 46.0 m$\Omega$ (Typical) | | **Operating Temperature** | -55°C to +125°C | | **Package / Case** | 1707 (approx. 17.5 x 17.2 x 7.0 mm) | | **Shielding** | Shielded (Magnetic Powder) | --- ### ## Core Electronic Features 1. **High Current Handling:** The "HCM" prefix stands for High Current Module. These inductors use an iron powder core material that allows for high saturation levels, preventing the inductance from dropping sharply under heavy loads. 2. **Magnetic Shielding:** The part is magnetically shielded to reduce Electromagnetic Interference (EMI). This is critical in compact electronics where components are placed close together. 3. **Low DCR:** The low Direct Current Resistance (46 m$\Omega$) ensures minimal energy loss through heat, making it highly efficient for power conversion. 4. **Soft Saturation:** Unlike ferrite cores that have a sharp saturation "cliff," the powder core in the HCM series provides a gradual decrease in inductance as current increases. --- ### ## Common Applications The HCM1707-470-R is typically found in power management circuits, including: * **Voltage Regulator Modules (VRMs):** Used in servers and desktop computers to step down voltage. * **DC-DC Converters:** Buck, Boost, and Buck-Boost topologies. * **Point-of-Load (POL) Converters:** Providing stable power to high-performance FPGAs or CPUs. * **Battery Powered Systems:** Where efficiency and low heat dissipation are required. --- ### ## Component Marking Breakdown * **HCM1707:** The series and physical dimensions (Length x Width x Height). * **470:** The inductance code. The first two digits are the value, and the third is the multiplier (47 x $10^0$ = 47 $\mu$H). * **R:** Indicates RoHS compliance.