The **CTX20-2-52-R** is a specific surface-mount toroidal inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the **OCTA-PAC®** series, which is known for its versatility in power applications. --- ## 1. Technical Specifications Below are the primary electrical and physical characteristics of the CTX20-2-52-R: | Property | Value / Description | | :--- | :--- | | **Inductance (L)** | 20 $\mu$H (nominal) | | **Current Rating ($I_{rms}$)** | ~2.54 Amps | | **DCR (Direct Current Resistance)** | ~0.045 $\Omega$ (Max) | | **Core Material** | Powdered Iron (Material -52) | | **Mounting Type** | Surface Mount (SMD) | | **Configuration** | Dual Winding (Two identical coils) | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ## 2. Key Features and Construction ### Dual Winding Versatility The most distinct feature of the CTX20 series is that it contains **two separate windings** on a single core. This allows the component to be used in three different ways: 1. **Series Connection:** Increases the total inductance. 2. **Parallel Connection:** Increases the current-carrying capacity while decreasing resistance. 3. **1:1 Transformer:** Can be used as a flyback transformer or for isolation. ### Material -52 Core The "-52" in the part number refers to the specific magnetic core material. * **Material -52** is a blue/green iron powder core. * It offers **lower core losses** at high frequencies compared to older materials (like -26). * It is ideal for power conversion applications operating up to 500kHz. --- ## 3. Typical Applications The CTX20-2-52-R is commonly found in the following electronic circuits: * **DC-DC Converters:** Used as a buck, boost, or forward converter inductor. * **Switch Mode Power Supplies (SMPS):** Energy storage and filtering. * **Noise Filtering:** Acting as a Common Mode Choke or Differential Mode Inductor. * **Battery Powered Systems:** Where high efficiency and small footprint are required. --- ## 4. Pinout Logic Since it has dual windings, there are typically 4 pins: * **Pins 1 & 4:** First winding (Start/Finish). * **Pins 2 & 3:** Second winding (Start/Finish). ```text Winding A: Pin 1 (Dot) ---- Pin 4 Winding B: Pin 2 (Dot) ---- Pin 3 ```