The **LD1-180-R** is a high-performance, surface-mount (SMT) power inductor manufactured by Eaton (formerly Bussmann/Coiltronics). It is part of the LD series, known for its low profile and high current-handling capabilities. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the LD1-180-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 18.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0820 Ω (Typical) | | **Saturation Current ($I_{sat}$)** | 2.10 Amperes | | **RMS Current ($I_{rms}$)** | 1.88 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | LD1 (approx. 6.1mm x 6.1mm x 3.0mm) | --- ### 2. Core Features and Construction The "R" suffix in the part number indicates that the component is **RoHS compliant**. * **Shielding:** The LD series generally features a non-shielded or semi-shielded ferrite drum core construction. This allows for a higher saturation current in a smaller footprint compared to fully shielded inductors, though it may result in higher Electromagnetic Interference (EMI). * **Material:** It utilizes a ferrite core which provides low core losses, making it efficient for high-frequency power conversion. * **Terminations:** Matte tin over copper plating, suitable for lead-free reflow soldering processes. --- ### 3. Common Applications Due to its balance of inductance and current rating, the LD1-180-R is typically found in the following circuits: 1. **DC-DC Converters:** Used in Buck (step-down), Boost (step-up), and SEPIC topologies. 2. **Voltage Regulator Modules (VRMs):** Providing stable power to microprocessors and FPGAs. 3. **Filtering:** Used in input/output filters to reduce ripple and noise in power supplies. 4. **Consumer Electronics:** Found in portable devices, LED drivers, and telecommunications equipment. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **LD:** Series name (Low Profile Inductor). * **1:** Size code (refers to the physical dimensions/footprint). * **180:** Inductance code (18 followed by 0 zeros = 18 µH). * **-R:** RoHS compliant.