## Overview of CTX5-1P-R The **CTX5-1P-R** is a high-performance, surface-mount (SMT) power inductor/transformer belonging to the **OCTA-PAC®** series manufactured by Eaton (formerly Coiltronics). It is known for its versatility, as it features dual windings that can be configured in multiple ways. --- ### 1. Key Technical Specifications | Parameter | Value / Range | | :--- | :--- | | **Inductance (Parallel)** | 5.3 µH | | **Inductance (Series)** | 21.2 µH | | **Current Rating (Isat)** | ~4.7A to 9.5A (Config. dependent) | | **DC Resistance (DCR)** | ~0.024 Ω to 0.096 Ω | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | Size 1 (approx. 11.4mm x 11.4mm) | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Physical Design and Construction The "R" in the part number indicates that the component is **RoHS compliant**. Its physical architecture consists of: * **Toroidal Core:** Uses a powdered iron core material which provides low EMI (Electromagnetic Interference) radiation. * **Dual Windings:** It contains two identical windings. This allows the user to connect them in **series** (for higher inductance) or **parallel** (for higher current capacity). * **Shielding:** The toroidal shape naturally contains the magnetic flux, making it "self-shielding" compared to traditional drum cores. --- ### 3. Common Applications Because of its dual-winding nature, the CTX5-1P-R is highly flexible: 1. **DC-DC Converters:** Used as a power inductor in buck, boost, or forward converters. 2. **SEPIC Topology:** Ideal for Single-Ended Primary-Inductor Converters where two inductors are needed on a single core. 3. **Common Mode Choke:** Can be used to filter out noise in power lines by utilizing the dual windings to cancel out common-mode interference. 4. **1:1 Isolation Transformer:** Can provide basic isolation between two circuits. --- ### 4. Terminal Configuration ```markdown Configuration | Connection Strategy ------------- | ------------------- Parallel | Terminals 1-4 joined and 2-3 joined (Lower Inductance, Higher Current) Series | Terminal 2 connected to 3; Input 1, Output 4 (Higher Inductance, Lower Current) Transformer | Winding 1 (1-2) as Primary; Winding 2 (3-4) as Secondary ``` ---