The **LD1-1R8-R** is a high-performance, surface-mount (SMD) power inductor part of the **LD Series** manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is specifically designed for high-density power conversion applications. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature where "1R8" indicates the inductance value. | Parameter | Specification | | :--- | :--- | | **Inductance** | 1.8 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | ~4.1 Amps (Typical) | | **Saturation Current (Isat)** | ~5.8 Amps (Typical) | | **DC Resistance (DCR)** | ~0.024 Ohms (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | LD1 (approx. 6.1mm x 6.1mm x 3.2mm) | --- ### 2. Physical Construction and Features The LD1-1R8-R is engineered for durability and efficiency: * **Magnetic Shielding:** It is a shielded drum core inductor. This minimizes Electromagnetic Interference (EMI), making it suitable for noise-sensitive circuits. * **Ferrite Core:** Utilizes a ferrite material that provides low core losses at high frequencies. * **RoHS Compliant:** The "-R" suffix indicates that the part is fully compliant with RoHS standards (lead-free). * **Robust Mounting:** Designed for pick-and-place surface mount assembly with high solder reflow temperature resistance. --- ### 3. Common Applications Due to its low DCR and high current handling, it is commonly used in: 1. **DC-DC Converters:** Buck, boost, and forward converters. 2. **Voltage Regulator Modules (VRMs):** Used in computing and telecommunications. 3. **Battery Powered Devices:** Ideal for handheld electronics where space and efficiency are critical. 4. **Filtering:** Used in output filter stages to smooth ripples in power supplies. --- ### 4. Equivalent Part Number Breakdown `LD1` - `1R8` - `R` * **LD1:** Series name and physical size code. * **1R8:** Inductance value ($1.8 \times 10^0$ microhenries). The "R" acts as a decimal point. * **R:** RoHS compliant indicator.