The **LD1-680-R** is a specific model of power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the **LD series**, which are high-current, drum-core power inductors designed for surface mount (SMD) applications. --- ### 1. Key Technical Specifications The "680" in the part number indicates the inductance value, while the "R" indicates RoHS compliance. | Parameter | Specification | | :--- | :--- | | **Inductance** | 68 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.191 Ohms (Maximum) | | **Saturation Current ($I_{sat}$)** | ~0.96 Amperes | | **RMS Current ($I_{rms}$)** | ~1.20 Amperes | | **Package / Case** | LD1 Size (approx. 4.45mm x 4.06mm) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Construction The LD1 series uses a **Drum Core** design. - **Core Material:** Ferrite, which provides high efficiency and low core losses at high frequencies. - **Form Factor:** Low profile, surface mount device (SMD) with a rugged construction. - **Termination:** Lead-free (RoHS) tin-plated copper leads. --- ### 3. Core Functions & Applications The LD1-680-R is primarily used as an energy storage element or a filter component. * **Energy Storage:** Used in DC-DC converters (Buck, Boost, or SEPIC) to store energy in the magnetic field during the switching cycle. * **Filtering:** Acts as a low-pass filter to smooth out ripples in power supplies or to suppress electromagnetic interference (EMI). * **Common Applications:** * LED Drivers * Battery-powered handheld devices * Computer peripherals * LCD displays and flat-panel TVs --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variations: | Segment | Meaning | | :--- | :--- | | **LD** | Low Profile / Drum Core Series | | **1** | Size Code (Physical dimensions) | | **680** | Inductance Code (68 x 10^0 = 68 µH) | | **-R** | RoHS Compliant | ---