The **CTX20-7-52LP-R** is a specialized power inductor, specifically a member of the **Octa-Pac® Plus** series manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). These components are unique because they feature **dual windings**, allowing them to be configured in multiple ways depending on the circuit design. --- ### 1. Key Technical Specifications | Parameter | Value (Series Connection) | Value (Parallel Connection) | | :--- | :--- | :--- | | **Inductance** | 81.3 µH | 20.3 µH | | **Full Load Current ($I_{rms}$)** | 1.83 A | 3.66 A | | **Peak Current ($I_{sat}$)** | 2.50 A | 5.00 A | | **DCR (Max)** | 0.134 $\Omega$ | 0.0335 $\Omega$ | **General Attributes:** * **Core Material:** Iron Powder (Type -52). * **Mounting:** Surface Mount (SMD). * **Operating Temp:** -40°C to +125°C. * **Termination:** Lead-free, RoHS compliant (indicated by the "-R" suffix). --- ### 2. Functional Characteristics #### Dual Winding Versatility The part consists of two separate coils wound on a single toroidal core. This allows the engineer to use it as: 1. **A Single Inductor:** By connecting the windings in series or parallel. 2. **A 1:1 Transformer:** To provide isolation or create multiple output voltages. 3. **A Common Mode Choke:** To filter electromagnetic interference (EMI). #### Low Profile (LP) Design The "LP" in the part number stands for **Low Profile**. These inductors are designed for space-constrained applications where vertical clearance is limited (approx. 6.35mm height). #### Core Material (-52) The "52" indicates a specific **Iron Powder** core material. This material is popular for its: * High saturation flux density. * Lower core losses at high frequencies (typically up to 500 kHz) compared to older iron powder mixes. --- ### 3. Common Applications * **DC-DC Converters:** Used in Buck, Boost, and SEPIC topologies. * **Power Supplies:** Ideal for VRMs (Voltage Regulator Modules) in telecommunications. * **Filtering:** Used in output filters to smooth current and reduce ripple. * **Battery Powered Systems:** High efficiency in a compact footprint. --- ### 4. Part Number Breakdown ```text CTX 20 - 7 - 52 LP - R | | | | | | | | | | | +-- RoHS Compliant | | | | +------- Low Profile | | | +---------- Core Material (-52) | | +-------------- Size Code | +------------------ Inductance (Parallel) approx 20µH +---------------------- Series Name (Octa-Pac) ```