## SDQ25-150-R: Electronic Specifications and Overview The **SDQ25-150-R** is a high-performance, surface-mount (SMD), dual-winding shielded inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the **SDQ series**, which is designed for applications requiring high power density and versatility. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 15.0 µH (nominal) | | **Tolerance** | ±20% | | **Configuration** | Dual Winding (4 terminals) | | **DC Resistance (DCR)** | ~0.116 Ω (per winding) | | **Irms (Current Rating)** | ~1.62 Amps | | **Isat (Saturation Current)** | ~1.31 Amps | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | --- ### 2. Functional Characteristics The "Dual Winding" nature of this component allows it to be used in several different electrical configurations: * **1:1 Transformer:** Can be used for isolation or voltage level shifting. * **Coupled Inductor:** Ideal for SEPIC (Single-Ended Primary-Inductor Converter) or Flyback topologies. * **Series Connection:** Connecting the windings in series increases the total inductance (4x the single winding value, approx. 60 µH). * **Parallel Connection:** Connecting the windings in parallel maintains the inductance but increases the current-handling capacity. --- ### 3. Physical Attributes and Design The component is built for durability and efficiency in compact electronic layouts: * **Shielding:** The magnetic shielding minimizes EMI (Electromagnetic Interference), making it suitable for noise-sensitive circuits. * **Footprint:** The "25" in the part number refers to the 5.2mm x 5.2mm x 2.5mm package size. * **Material:** It typically features a ferrite core and is RoHS compliant (indicated by the `-R` suffix). --- ### 4. Common Applications Due to its versatile dual-winding design, it is frequently found in: 1. **DC-DC Converters:** Specifically SEPIC, Cuk, and Flyback types. 2. **Battery Powered Equipment:** Where high efficiency and small size are critical. 3. **VRMs (Voltage Regulator Modules):** Used in computing and telecommunications. 4. **Filtering:** Common mode or differential mode noise filtering. ---