## Technical Overview: UP2UC-681-R The **UP2UC-681-R** is a high-performance, surface-mount (SMD) power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the Uni-Pac series, designed for applications requiring high energy storage and low power loss. ### 1. Key Specifications The technical parameters of the UP2UC-681-R are summarized in the table below: | Feature | Specification | | :--- | :--- | | **Inductance** | 680 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 1.15 Ω (Max) | | **Rated Current (Irms)** | 0.52 Amps | | **Saturation Current (Isat)** | 0.61 Amps | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | SMD (approx. 12.9mm x 9.4mm) | | **Shielding** | Non-Shielded | --- ### 2. Physical Construction The "UP2UC" designation refers to the physical footprint and core material type: * **Core Material:** Ferrite drum core, which provides high efficiency and high frequency stability. * **Termination:** Matte tin over copper, ensuring excellent solderability for Reflow or Wave soldering. * **Design:** A "drum core" style that is robust and optimized for cost-effective power conversion. ### 3. Common Applications This specific inductor (680 µH) is typically found in circuits that require significant energy storage or filtering for lower current loads: * **DC-DC Converters:** Buck, Boost, and SEPIC topologies. * **Filtering:** Used in EMI/RFI suppression for power lines. * **Industrial Electronics:** Power supplies for sensors and low-power control boards. * **LED Drivers:** Providing stable current for lighting arrays. ### 4. Part Number Breakdown Understanding the Eaton nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **UP2UC** | Series Name (Uni-Pac size 2UC) | | **681** | Inductance Code (68 + 1 zero = 680 µH) | | **-R** | RoHS Compliant | ---