## Technical Overview: CTX10-4-R The **CTX10-4-R** is a high-performance, shielded inductor from the **OCTA-PAC® PLUS** series, manufactured by Eaton (formerly Coiltronics). It is unique because it features **dual windings**, allowing it to be used as a single inductor, two separate inductors, or a 1:1 transformer. --- ### 1. Key Technical Specifications | Parameter | Value / Range | | :--- | :--- | | **Inductance (Parallel)** | 10.3 µH | | **Inductance (Series)** | 41.2 µH | | **Current Rating (Parallel)** | 4.38 Amps | | **DC Resistance (Max)** | 0.0355 Ω (Parallel) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | | **Shielding** | E-core (Semi-shielded) | --- ### 2. Physical Construction & Configuration The "R" suffix indicates that the part is **RoHS compliant**. The device consists of two identical windings on a single magnetic core. This provides flexibility in circuit design: * **Parallel Connection:** Connect pins (1-2) and (4-3). This doubles the current capacity while keeping the base inductance. * **Series Connection:** Connect pins (2-4). This quadruples the inductance ($L_{total} = L_1 + L_2 + 2M$) and is used for higher voltage filtering. * **Transformer Mode:** Use one winding as a primary and the other as a secondary for 1:1 isolation or flyback applications. --- ### 3. Common Applications * **DC-DC Converters:** Used in Buck, Boost, and SEPIC topologies. * **EMI Filtering:** Excellent for common-mode noise suppression due to the dual-winding structure. * **Power Supplies:** High-density power modules for industrial and telecommunications equipment. * **Isolation:** Small-scale signal or power isolation where a 1:1 turns ratio is required. --- ### 4. Footprint and Dimensions The OCTA-PAC® PLUS size 4 generally follows these approximate dimensions: * **Length:** ~15.0 mm * **Width:** ~12.5 mm * **Height:** ~6.35 mm ---