The **CTX1-2-R** is a specific electronic component belonging to the **OCTA-PAC®** series of surface-mount (SMT) power inductors and transformers, manufactured by Coiltronics (now a brand of Eaton). --- ## 1. Technical Specifications The CTX1-2-R is a dual-winding inductor designed for versatility. The "2" in the part number indicates the size/power rating, and "R" signifies RoHS compliance. | Feature | Specification | | :--- | :--- | | **Manufacturer** | Eaton (Coiltronics) | | **Inductance (Parallel)** | ~1.0 µH | | **Inductance (Series)** | ~4.0 µH | | **Peak Current Rating** | ~4.0 - 5.5 Amps (depending on configuration) | | **Number of Windings** | 2 (Dual Winding) | | **Mounting Type** | Surface Mount (SMT) | | **Operating Temperature** | -40°C to +125°C | --- ## 2. Key Internal Characteristics ### Dual Winding Versatility The most important feature of the CTX1-2-R is its **two identical windings**. This allows the component to be used in three distinct ways: 1. **Inductor (Series):** Connecting the two windings in series quadruples the inductance. 2. **Inductor (Parallel):** Connecting them in parallel keeps the inductance the same as a single winding but doubles the current capacity. 3. **1:1 Transformer:** Using one winding as the primary and the other as the secondary for isolation or voltage transformation. ### Material Construction * **Core Type:** Powered Iron (typically), which offers high saturation flux density. * **Shielding:** It is generally non-shielded, meaning careful placement is required to avoid Electromagnetic Interference (EMI) with nearby sensitive circuits. --- ## 3. Common Applications Because of its dual-winding nature, the CTX1-2-R is found in various power management circuits: * **SEPIC Converters:** Used as the coupled inductor required to step voltage up or down. * **Flyback Transformers:** Providing isolation in low-power DC-DC converters. * **Common Mode Chokes:** Filtering out high-frequency noise in power lines. * **Buck/Boost Converters:** Standard energy storage in voltage regulation circuits. --- ## 4. Footprint and Physical Dimensions The **OCTA-PAC PLUS** size 2 package is characterized by a low profile and a "gull-wing" lead design, which provides excellent solder joint integrity during thermal cycling. | Dimension | Approx. Value | | :--- | :--- | | **Length** | 11.43 mm | | **Width** | 11.43 mm | | **Height** | 4.83 mm | ---