The **1025HC30-R** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converters and high-current power supplies. It belongs to the **1025HC series** manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). --- ## 1. Key Specifications The technical parameters define how the component behaves under electrical load: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.30 µH (Microhenries) | | **Tolerance** | ±20% | | **Rated Current ($I_{rms}$)** | ~30 Amperes | | **Saturation Current ($I_{sat}$)** | ~50 Amperes | | **DC Resistance (DCR)** | Extremely Low (typically < 1.0 mΩ) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | ~10.5mm x 10.2mm x 5.0mm | --- ## 2. Construction and Design The "HC" in the part number stands for **High Current**. The physical construction is optimized for efficiency: * **Flat Wire Technology:** Instead of round wire, it uses flat copper wire. This maximizes the cross-sectional area, reducing DC resistance and skin effect losses at high frequencies. * **Powder Iron Core:** The core material is designed for soft saturation, meaning the inductance doesn't drop off instantly when current spikes. * **Magnetic Shielding:** The design is shielded to reduce Electromagnetic Interference (EMI), which is critical in dense PCB layouts. --- ## 3. Typical Applications Because of its high current handling and low profile, the 1025HC30-R is found in: 1. **Voltage Regulator Modules (VRMs):** Powering CPUs and GPUs in servers and desktops. 2. **Point-of-Load (POL) Converters:** Converting high-voltage bus lines to low-voltage rails for digital ICs. 3. **Telecom Equipment:** High-density power supplies for networking hardware. 4. **Battery Powered Systems:** Where high efficiency is needed to extend battery life. --- ## 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **1025:** Refers to the physical dimensions (Approx. 10mm x 10mm). * **HC:** High Current series. * **30:** Represents the inductance value (0.30 µH). * **-R:** Indicates the part is **RoHS Compliant** (Lead-free).