The part number **M5RJ74UPJ-R** refers to a high-performance **RJ45 Connector with Integrated Magnetics** (often called a "MagJack"), typically manufactured by companies like **Link-PP** or compatible hardware vendors. These components are essential in networking hardware to provide physical connectivity and electrical isolation for Ethernet interfaces. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Connector Type** | RJ45 Female | | **Orientation** | Right Angle (90°) / Tab-Up | | **Ethernet Speed** | 10/100/1000 Base-T (Gigabit Ethernet) | | **Number of Ports** | 1x1 (Single Port) | | **LED Configuration** | Green / Yellow (Standard status indicators) | | **Mounting Type** | Through-Hole (THT) | | **Shielding** | EMI Finger/Metallic Shielding | --- ### 2. Functional Electronic Components The "Integrated Magnetics" inside this part consist of several discrete components condensed into the RJ45 housing: * **Isolation Transformer:** Protects the internal circuitry from high-voltage surges on the network line (typically rated for 1500Vrms). * **Common Mode Chokes:** Used to suppress Electromagnetic Interference (EMI) and noise to ensure signal integrity. * **Termination Resistors:** Usually 75-ohm resistors (Bob Smith Termination) to reduce reflections and handle common-mode signals. * **High-Voltage Capacitor:** Provides a path for AC noise to ground while maintaining DC isolation. --- ### 3. Pinout and Internal Logic The part typically follows the standard **Gigabit Magnetics Schematic**: 1. **PHY Side Pins:** Connects to the Ethernet Controller/PHY chip on your PCB. 2. **Cable Side Pins:** Standard 8-pin interface for the Cat5e/Cat6 Ethernet cable. 3. **LED Pins:** Four pins (two for each LED) that require current-limiting resistors on the PCB side to indicate Link and Activity status. --- ### 4. Applications * **Networking Gear:** Switches, Routers, and Hubs. * **Industrial PC:** Embedded motherboards and Single Board Computers (SBCs). * **IoT Gateways:** Devices requiring wired internet stability. * **Consumer Electronics:** Smart TVs and Game Consoles. ---