The **CTX8-4A-R** is a high-performance, surface-mount (SMT) power inductor manufactured by Eaton (formerly Cooper Bussmann). It belongs to the **OCTA-PAC® PLUS** series, which is specifically designed for high power density and versatility in DC-DC converters. --- ### 1. Key Technical Specifications The CTX8-4A-R is a dual-winding inductor, meaning it contains two separate coils within a single package. | Parameter | Specification | | :--- | :--- | | **Inductance (Parallel)** | 8.24 µH | | **Inductance (Series)** | 33.1 µH | | **Current Rating (Isat)** | ~4.73 A (Parallel) | | **DC Resistance (DCR)** | ~0.038 Ω (Parallel) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | Size 4 (Approx. 15mm x 12.4mm) | | **Termination** | RoHS Compliant (Lead-Free) | --- ### 2. Physical Design and Features * **Dual Winding Construction:** The "8" in the part number refers to the core size, and the "4" indicates the specific winding configuration. Having two windings allows the component to be used as an inductor, a 1:1 transformer, or a common-mode choke. * **Toroidal Core:** It utilizes a powdered iron toroidal core. This geometry provides excellent magnetic field self-containment, reducing Electro-Magnetic Interference (EMI). * **Surface Mount Technology (SMT):** Designed for pick-and-place assembly, it features robust wing-lead terminations for secure soldering. --- ### 3. Common Applications Because of its dual-winding nature, the CTX8-4A-R is highly versatile: 1. **Buck/Boost Converters:** Used for energy storage in power supply circuits. 2. **SEPIC Converters:** Ideal for Single-Ended Primary-Inductor Converters where two inductors are needed on one core. 3. **1:1 Transformers:** Used for isolating two circuits or providing a secondary voltage rail. 4. **Common-Mode Chokes:** Used in EMI filtering to suppress noise in power lines. --- ### 4. Part Number Breakdown | Component | Meaning | | :--- | :--- | | **CTX** | Product Series (OCTA-PAC) | | **8** | Physical Size/Power Level | | **4A** | Internal winding/inductance code | | **-R** | RoHS Compliant (Lead-free) | ---