The **CTX100-3P-R** is a high-performance, surface-mount power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the **OCTA-PAC® Plus** series, which is known for its versatility and high power density. --- ## 1. Core Technical Specifications The CTX100-3P-R is designed to handle significant energy storage and filtering requirements in a compact form factor. | Parameter | Specification | | :--- | :--- | | **Inductance** | 100 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~0.76 Amps (typical) | | **DC Resistance (DCR)** | ~0.537 Ohms (maximum) | | **Core Material** | Powdered Iron | | **Packaging** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +125°C | --- ## 2. Key Features and Construction ### Toroidal Geometry The part utilizes a **toroidal (ring-shaped)** core. This shape is highly efficient because it contains the magnetic flux within the core itself, significantly reducing **Electromagnetic Interference (EMI)** and crosstalk with neighboring components on the PCB. ### Material Science The "3P" in the part number indicates the use of **Type 3 Iron Powder**. This material is optimized for: * Higher power applications. * Stable performance across a wide temperature range. * Lower core losses compared to standard iron powder in high-frequency switching. ### Termination and Compliance * **RoHS Compliant:** The "-R" suffix confirms that the part is lead-free and meets environmental safety standards. * **Rugged Design:** The component is encapsulated in a liquid crystal polymer (LCP) case, providing excellent mechanical protection and moisture resistance. --- ## 3. Common Applications Because of its high inductance and EMI shielding, the CTX100-3P-R is typically found in: 1. **DC-DC Converters:** Used as a storage inductor in buck, boost, or forward converters. 2. **Output Filters:** Smoothing high-frequency ripple in switching power supplies. 3. **Signal Conditioning:** Used in telecommunications equipment to filter noise from power lines. 4. **Industrial Controls:** Integrated into heavy-duty sensor interfaces where reliability is critical. --- ## 4. Equivalent Circuit Representation In a circuit simulation (like SPICE), the CTX100-3P-R is represented by more than just its inductance: ```spice * CTX100-3P-R Equivalent Model L1 NodeA NodeB 100uH ; Main Inductance R1 NodeB NodeC 0.537 ; Series DC Resistance (DCR) C1 NodeA NodeC 5pF ; Parasitic Capacitance (Estimated) ```