The **LD1-390-R** is a high-performance, surface-mount (SMT) power inductor belonging to the **LD Series** manufactured by **Eaton (formerly Coiltronics)**. It is specifically designed for high-density power applications. --- ### 1. Technical Specifications The part number follows a specific nomenclature. Here are the core electronic characteristics for the **390-R** variant: | Parameter | Value | | :--- | :--- | | **Inductance** | 39.0 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | ~1.39 Amps (Typical) | | **Saturation Current (Isat)** | ~1.58 Amps (Typical) | | **DC Resistance (DCR)** | 0.133 Ohms (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package/Size** | LD1 (approx. 9.4mm x 9.4mm) | --- ### 2. Key Features * **High Power Density:** Optimized for high current carrying capacity in a small footprint. * **Shielded Construction:** The inductor is magnetically shielded, which minimizes Electromagnetic Interference (EMI) with surrounding components. * **Robust Materials:** Features a ferrite core material that maintains efficiency even at high frequencies. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS environmental standards. --- ### 3. Common Applications The LD1-390-R is typically found in circuits requiring stable energy storage and noise filtering: * **DC-DC Converters:** Used as the primary energy storage element in buck, boost, or buck-boost regulators. * **Switching Power Supplies:** Ideal for VRMs (Voltage Regulator Modules) in computing. * **Battery Powered Equipment:** Its low DCR helps maintain high efficiency, extending battery life. * **Input/Output Filtering:** Smoothing out ripples in power lines for sensitive electronics. --- ### 4. Physical Dimensions (LD1 Footprint) The "LD1" size designation corresponds to the following physical constraints: * **Length:** 9.40 mm * **Width:** 9.40 mm * **Height:** 5.0 mm (Max) ---