The **CTX5-4A-R** is a specific electronic component belonging to the **OCTA-PAC® PLUS** series, manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is a versatile, high-power density surface-mount (SMT) inductor/transformer. --- ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 4.88 µH (at 0A DC) | | **Rated Current (Irms)** | 6.31 Amperes | | **Saturation Current (Isat)** | 10.1 Amperes | | **DC Resistance (DCR)** | 0.0104 Ohms (Max) | | **Operating Temperature** | -40°C to +125°C | | **Construction** | Toroidal core with 6-pin SMT base | --- ### 2. Core Functional Features #### A. Multiple Winding Configuration The "CTX" series features **dual windings**. This means the part consists of two separate coils wound on the same core. This allows the part to be used in multiple configurations: * **Series Connection:** Increases total inductance. * **Parallel Connection:** Increases current handling capability. * **1:1 Transformer:** Used for isolation or SEPIC converters. #### B. Magnetic Shielding Because it uses a toroidal (ring-shaped) core, the magnetic flux is contained within the core material. This results in **very low Electromagnetic Interference (EMI)**, making it ideal for noise-sensitive boards. #### C. High Power Density The "PLUS" designation indicates the use of high-performance materials that allow for higher current ratings and lower core losses compared to the standard OCTA-PAC series. --- ### 3. Common Applications The CTX5-4A-R is primarily used in power management circuits, including: 1. **DC-DC Converters:** Specifically Buck, Boost, and Forward converters. 2. **SEPIC & Zeta Topologies:** Utilizing the dual-winding nature for coupled inductors. 3. **Filtering:** Used as a high-current common-mode choke or differential mode filter to remove noise from power lines. 4. **Isolation:** Providing 500VAC isolation between windings in low-power signal or power circuits. --- ### 4. Part Number Breakdown * **CTX:** Series prefix (OCTA-PAC). * **5:** Size code (refers to the physical footprint and height). * **4:** Inductance code. * **A:** Design revision or specific material characteristic. * **R:** RoHS compliant (Lead-free). ---