## CTX33-1P-R: Product Overview The **CTX33-1P-R** is a high-performance, surface-mount (SMD) power inductor/transformer belonging to the **OCTA-PAC®** series manufactured by **Eaton (formerly Coiltronics)**. It is characterized by its dual-winding design, which allows it to be used in various circuit configurations. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance (Parallel)** | 32.8 µH | | **Inductance (Series)** | 131.2 µH | | **Current Rating (Parallel)** | ~1.31 A | | **DC Resistance (DCR)** | 0.115 Ω (Parallel) | | **Package Type** | SMD (Surface Mount) | | **Core Material** | Powder Iron | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Functional Features The CTX33-1P-R is unique because it features **two identical windings**. This offers three primary modes of operation: * **Parallel Connection:** Connect the windings in parallel to increase the current-carrying capacity while maintaining a lower inductance. * **Series Connection:** Connect the windings in series to quadruple the inductance (as $L_{total} = L1 + L2 + 2M$). * **Transformer/Coupled Mode:** Use it as a 1:1 isolation transformer or a coupled inductor for SEPIC or Flyback topologies. --- ### 3. Typical Applications The versatility of the OCTA-PAC® series makes the CTX33-1P-R suitable for: 1. **DC-DC Converters:** Buck, Boost, and Forward converters. 2. **SEPIC Converters:** Utilizing the coupled windings for energy transfer. 3. **EMI Filtering:** Used as a common-mode choke to filter high-frequency noise. 4. **Isolation:** Providing 1:1 signal or power isolation in low-power circuits. --- ### 4. Part Number Breakdown ```text CTX 33 - 1 P - R | | | | | | | | | └── RoHS Compliant | | | └── Package Size (P = OCTA-PAC) | | └── Power Rating/Inductance Code | └── Inductance Value (approximate) └── Series Name (Coiltronics) ```