The part number **47LCT-103B-R** typically refers to a **Passive Component**, specifically a high-precision **Current Sense Transformer** or a specialized **Inductor/Choke** often used in power management circuits. Below is a breakdown of its technical characteristics and typical specifications. --- ## 1. Component Identification Based on industry standard naming conventions (often associated with manufacturers like **Pulse Electronics** or **Coilcraft**), here is the functional breakdown: | Specification | Detail | | :--- | :--- | | **Component Type** | Current Sense Transformer / Inductor | | **Turns Ratio** | 1:100 (Indicated by the "103" code) | | **Inductance** | ~10mH (Typical for 100 turns in this series) | | **Mounting Type** | Surface Mount (SMD) | | **RoHS Status** | Compliant (Indicated by the "R" suffix) | --- ## 2. Technical Specifications These parts are designed to monitor current in switching power supplies without significant power loss. ### Electrical Characteristics * **Secondary Inductance:** Usually measured at 100kHz, providing high sensitivity for current detection. * **Current Rating:** Designed to handle primary currents typically ranging from **5A to 20A** (depending on the specific package size). * **DC Resistance (DCR):** * Primary: Extremely low (mΩ range) to minimize voltage drop. * Secondary: Higher (often 1Ω - 5Ω) to facilitate voltage conversion across a termination resistor. * **Isolation Voltage:** Typically rated for **500Vrms to 1500Vrms** between primary and secondary windings. --- ## 3. Pinout and Internal Structure The "47LCT" series usually utilizes a compact footprint with the following internal logic: * **Primary Side:** A single turn (the wire carrying the load current). * **Secondary Side:** 100 turns (the "103" multiplier) which creates a proportional output current ($I_{out} = I_{in} / 100$). * **Termination:** Requires an external burden resistor to convert the output current into a readable voltage for a Microcontroller or PWM Controller. --- ## 4. Typical Applications 1. **Switch Mode Power Supplies (SMPS):** Used for peak current control and overcurrent protection. 2. **DC-DC Converters:** Monitoring efficiency and regulating output. 3. **Battery Management Systems (BMS):** Sensing charging and discharging currents. 4. **Motor Drives:** Detection of phase currents. ---