The **CTX100-2-R** is a high-performance, surface-mount (SMT) power inductor/transformer belonging to the **OCTA-PAC® PLUS** series, manufactured by Eaton (formerly Bussmann/Coiltronics). --- ### 1. Technical Specifications This component is unique because it features **dual windings**, allowing it to be used as an inductor, a 1:1 transformer, or a coupled inductor. | Parameter | Specification (Series Connection) | Specification (Parallel Connection) | | :--- | :--- | :--- | | **Inductance** | 402.1 $\mu$H | 100.5 $\mu$H | | **Rated Current ($I_{rms}$)** | 1.18 A | 2.37 A | | **Peak Current ($I_{sat}$)** | 1.54 A | 3.08 A | | **DC Resistance (DCR)** | 0.358 $\Omega$ | 0.089 $\Omega$ | | **Turns Ratio** | 1:1 | N/A | ### 2. Physical Characteristics * **Mounting Type:** Surface Mount (SMD/SMT). * **Core Material:** Powered Iron (offering high saturation flux density). * **Shielding:** Unshielded (standard for this series). * **Dimensions:** Approximately $14.22 \text{mm} \times 11.43 \text{mm} \times 6.35 \text{mm}$. ### 3. Key Electronic Functions Because the CTX100-2-R has two identical windings, it offers significant flexibility in circuit design: 1. **Buck/Boost Inductor:** Using windings in series or parallel to handle different current loads. 2. **1:1 Isolation Transformer:** Providing galvanic isolation between two circuits. 3. **Common Mode Choke:** Used to filter out electromagnetic interference (EMI) in power lines. 4. **SEPIC Converter Inductor:** Ideal for Single-Ended Primary-Inductor Converters where coupled inductors are required. ### 4. Part Number Breakdown The nomenclature follows the Coiltronics standard: * **CTX:** Series prefix. * **100:** Nominal inductance value (100 $\mu$H in parallel configuration). * **2:** Size/Frame code (Size 2). * **R:** RoHS compliant (Lead-free). --- ### 5. Application Circuit Example ```c // Wiring Configurations for CTX100-2-R // Configuration A: Series (Pins 1 to 4, tie 2 and 3) // Result: 400uH inductance, lower current capacity. // Configuration B: Parallel (Pins 1+2 to 3+4) // Result: 100uH inductance, higher current capacity. ```