The **UP5-681-R** is a high-performance, shielded power inductor belonging to the **Uni-Pac 5 (UP5)** series, manufactured by **Eaton (formerly Coiltronics)**. These components are designed for high-density power applications. --- ## 1. Technical Specifications The part number "681" indicates the inductance value, and "R" denotes RoHS compliance. | Parameter | Value | | :--- | :--- | | **Inductance** | 680 µH | | **Tolerance** | ±20% | | **Inductance Code** | 681 (68 x 10^1) | | **DC Resistance (DCR)** | ~0.957 Ω (Typical) | | **RMS Current ($I_{rms}$)** | 0.77 Amps | | **Peak Current ($I_{sat}$)** | 0.90 Amps | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temp** | -40°C to +125°C | --- ## 2. Key Features ### A. Magnetic Shielding The UP5 series features a ferrite drum core with a ring sleeve. This construction minimizes **Electromagnetic Interference (EMI)**, making it suitable for noise-sensitive circuits. ### B. High Power Density The "Uni-Pac" design provides a high inductance-to-size ratio. It is specifically engineered to handle high transient current spikes without saturating immediately. ### C. Construction & Materials * **Core Material:** Ferrite. * **Termination:** Lead-free, matte tin over copper. * **Packaging:** Available in tape and reel for automated SMT assembly. --- ## 3. Common Applications Due to its high inductance (680 µH), this part is typically used in filtering and energy storage for lower-current, higher-voltage regulation tasks. 1. **DC-DC Converters:** Buck, Boost, and SEPIC topologies. 2. **Industrial Electronics:** Power supplies for sensors and controllers. 3. **Input/Output Filtering:** Used to smooth ripples in power lines. 4. **LED Lighting:** Drivers requiring stable current regulation. --- ## 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **UP5** | Uni-Pac Series Size 5 (Physical dimensions ~18.5mm x 15.2mm) | | **681** | Inductance: **68** + **1** zero = 680 µH | | **-R** | RoHS Compliant (Lead-Free) | ---