The **CTX110657-R** is a high-performance **Surface Mount (SMT) Power Inductor** manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the Octa-Pac® series, known for its versatility and high power density. --- ### 1. Key Technical Specifications The following table highlights the primary electrical and physical characteristics of this component: | Parameter | Value | | :--- | :--- | | **Inductance** | 56.6 µH (Nominal) | | **Current Rating (Irms)** | ~0.76 Amps | | **Saturation Current (Isat)** | ~0.84 Amps | | **DC Resistance (DCR)** | 0.443 Ohms (Max) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | | **Package / Case** | Octa-Pac size 1 (approx. 8.9mm x 8.9mm) | --- ### 2. Core Features & Construction * **Dual Winding Construction:** The CTX110657-R features two separate windings. This allows the inductor to be configured in three ways: * **Series:** For higher inductance. * **Parallel:** For higher current capacity. * **1:1 Transformer:** For use in SEPIC or Flyback topologies. * **Magnetic Shielding:** The part is designed to minimize Electromagnetic Interference (EMI), making it suitable for noise-sensitive circuits. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and compliant with environmental regulations. --- ### 3. Typical Applications Due to its dual-winding nature and compact size, this part is commonly found in: * **DC-DC Converters:** Specifically Buck, Boost, and SEPIC converters. * **Power Supplies:** Used in telecommunications, computers, and industrial handheld devices. * **Filtering:** Used as a common-mode choke or for ripple current reduction in power lines. --- ### 4. Comparison: Series vs. Parallel Connection Since this is a dual-winding inductor, the electrical behavior changes based on how you solder it to the PCB: | Configuration | Inductance | DC Resistance (DCR) | Current Rating | | :--- | :--- | :--- | :--- | | **Parallel** | $L$ (Base) | $DCR / 2$ | $Current \times 2$ | | **Series** | $L \times 4$ | $DCR \times 2$ | $Current$ | ---