### Overview of CTX210403-R The **CTX210403-R** is a high-performance, surface-mount (SMD) power inductor/transformer typically utilized in DC-DC converters and power management circuits. It is part of the **OCTA-PAC** or **ECONO-PAC** series produced by **Eaton (formerly Bussmann/Coiltronics)**. --- ### Key Technical Specifications The component is characterized by its dual-winding architecture, allowing it to be used as an inductor, a coupled inductor, or a 1:1 transformer. | Parameter | Specification | | :--- | :--- | | **Inductance** | 40.0 µH (approximate, varies by connection) | | **Current Rating (Irms)** | ~2.10 Amps | | **DCR (Direct Current Resistance)** | ~0.085 Ohms | | **Mounting Type** | Surface Mount Device (SMD) | | **Configuration** | Dual Winding (6-pin footprint) | | **Operating Temperature** | -40°C to +125°C | --- ### Core Electronic Characteristics #### 1. Dual Winding Versatility The CTX210403-R consists of two identical windings. This provides engineers with three primary configuration options: * **Series Connection:** Increases total inductance (L) but maintains the same current rating. * **Parallel Connection:** Maintains base inductance but doubles the current-carrying capacity. * **1:1 Transformer:** Functions as a flyback transformer or an isolator. #### 2. Magnetic Shielding These parts are generally designed with a **toroidal core** geometry. This shape is inherently self-shielding, which minimizes Electromagnetic Interference (EMI) and prevents magnetic flux from affecting neighboring components on a high-density PCB. #### 3. Low Core Loss Constructed using powdered iron or ferrite materials optimized for high-frequency switching (typically up to 500 kHz or higher), ensuring high efficiency in power conversion stages. --- ### Typical Applications * **Buck/Boost Converters:** Used for energy storage in voltage regulation. * **SEPIC Converters:** Ideal due to the dual-winding requirement for coupling. * **Common Mode Chokes:** Used for filtering noise out of power lines. * **Isolation:** Providing low-voltage isolation between two circuit segments. --- ### Typical Circuit Symbol & Connection ```text Winding 1: Pins 1 --- (Core) --- 6 Winding 2: Pins 2 --- (Core) --- 5 (Pins 3 and 4 are usually for mechanical stability or unused) ```