## Technical Overview: CTX2-3-R (Octa-Pack Inductor) The **CTX2-3-R** is a high-performance, surface-mount (SMD) power inductor/transformer manufactured by **Eaton (formerly Coiltronics)**. It belongs to the **OCTA-PACK** series, which is characterized by its versatile multi-winding design. --- ### 1. Key Technical Specifications The "2-3" in the part number refers to the specific inductance and current rating within the series, while the "-R" indicates RoHS compliance. | Feature | Specification | | :--- | :--- | | **Inductance (Parallel)** | ~2.3 μH | | **Inductance (Series)** | ~9.2 μH | | **Heating Current (Irms)** | ~5.3 A | | **Saturation Current (Isat)** | ~10.2 A | | **DC Resistance (DCR)** | ~0.014 Ω (per winding) | | **Number of Windings** | 6 Winding (Multiple configurations) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Internal Construction and Design The CTX2-3-R is unique because it is not a simple two-terminal inductor. It features: * **Multi-Winding Architecture:** It contains six identical windings. This allows the user to configure the part as an inductor, a transformer, or a coupled inductor. * **Toroidal Core:** Uses a high-frequency powdered iron or ferrite core (depending on the specific sub-series) which offers excellent flux linkage and low EMI (Electromagnetic Interference). * **Surface Mount Package:** Designed for automated pick-and-place assembly. --- ### 3. Circuit Configurations Because there are six windings, the electrical properties change based on how you wire the pins: * **Series Connection:** Connecting windings in series increases the total inductance ($L_{total} = L \times N^2$) but maintains a lower current rating. * **Parallel Connection:** Connecting windings in parallel keeps the inductance low but significantly increases the current handling capability. * **1:1 (or other ratio) Transformer:** Use one set of windings as the primary and another as the secondary for isolated power conversion. --- ### 4. Common Applications Due to its flexibility, the CTX2-3-R is found in: 1. **SEPIC Converters:** Ideal for applications where input voltage can be higher or lower than output voltage. 2. **Buck/Boost Converters:** High-efficiency power regulation. 3. **EMI Filters:** Used as a common-mode choke. 4. **Isolation:** Small-scale isolated power supplies (e.g., 5V to 5V isolated). --- ### 5. Part Number Breakdown ```text CTX - 2 - 3 - R (1) (2) (3) (4) (1) Series Name: OCTA-PACK (2) Size/Power Rating Indicator (3) Specific Inductance/Current Code (4) RoHS Compliant ```