The **SD12-680-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the SD12 series, which is designed for space-constrained applications requiring high efficiency. --- ### 1. Key Technical Specifications The part number "680" indicates the inductance value, while the "R" indicates RoHS compliance. | Parameter | Specification | | :--- | :--- | | **Inductance** | 68.0 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 0.50 Amps | | **Saturation Current (Isat)** | 0.46 Amps | | **DC Resistance (DCR)** | 0.776 Ohms (max) | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | 5.2mm x 5.2mm x 1.2mm | --- ### 2. Physical Construction * **Shielding:** It is a **magnetically shielded** inductor. This is critical for minimizing Electromagnetic Interference (EMI) in dense circuit layouts. * **Core Material:** Ferrite core technology, which provides high efficiency and low core losses. * **Form Factor:** Surface Mount Device (SMD). The "12" in the series name refers to its height (1.2 mm), making it an "ultra-low profile" component. --- ### 3. Functional Applications The SD12-680-R is primarily used in power management circuits where vertical space is limited. 1. **DC-DC Converters:** Used in buck (step-down), boost (step-up), and buck-boost topologies. 2. **Portable Electronics:** Ideal for smartphones, tablets, and handheld GPS devices due to the 1.2mm height. 3. **LED Drivers:** Used to maintain constant current in small-scale lighting applications. 4. **Battery Powered Equipment:** Its low DCR helps maximize battery life by reducing power dissipation. --- ### 4. Circuit Symbol & Footprint ```text L1 (68uH) +---(ZZZ)---+ | | (In) (Out) ``` * **Land Pattern:** The footprint usually consists of two square pads (approx 2.1mm x 1.5mm) separated by a gap of 2.1mm.