The **CTX15-1-R** is a high-performance, surface-mount (SMT) power inductor/transformer belonging to the **OCTA-PAC®** series, manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is characterized by its unique **dual-winding** design, which allows it to be used in various circuit configurations. --- ### 1. Technical Specifications Below are the key electrical and physical parameters for the CTX15-1-R: | Parameter | Specification | | :--- | :--- | | **Inductance (Parallel)** | 15.1 µH | | **Inductance (Series)** | 60.4 µH | | **Current Rating (Irms)** | 1.83 Amps (Parallel) | | **DC Resistance (DCR)** | 0.0632 Ω (Parallel) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | OCTA-PAC® Size 1 | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Core Features * **Dual Winding Construction:** It consists of two identical windings that can be connected in series or parallel. This provides flexibility in managing inductance and current capacity. * **Magnetic Shielding:** The part is designed to minimize Electro-Magnetic Interference (EMI), making it suitable for noise-sensitive environments. * **High Power Density:** Its compact footprint allows for high power handling relative to its size. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS environmental standards. --- ### 3. Common Applications The CTX15-1-R is versatile and is typically found in the following roles: 1. **Buck/Boost Converters:** Used as a primary energy storage inductor in DC-DC conversion. 2. **SEPIC Converters:** The dual windings make it ideal for Single-Ended Primary-Inductor Converters. 3. **1:1 Isolation Transformers:** Can be used to provide galvanic isolation between two circuits with a 1:1 turns ratio. 4. **Common Mode Chokes:** Useful for filtering noise out of power lines. --- ### 4. Connection Diagram Logic Because it has four pads, the behavior changes based on how you solder it to the PCB: * **Parallel Connection:** Connect Pin 1 to 2 and Pin 4 to 3. This yields **low inductance (15.1 µH)** but **higher current** capacity. * **Series Connection:** Connect Pin 2 to 4. This yields **high inductance (60.4 µH)** but **lower current** capacity.