The **47DR-1112-R** is a specific part number belonging to a series of **RJ45 Integrated Connector Modules (ICM)**, manufactured by companies like **Bel Fuse (Stewart Connector)**. These components are more than just simple plastic jacks; they are "MagJacks" that integrate the physical connector with the necessary electromagnetic components for Ethernet communication. --- ## 1. Technical Specifications Below is a breakdown of the typical specifications for this component: | Parameter | Specification | | :--- | :--- | | **Component Type** | RJ45 Integrated Connector (MagJack) | | **Ports** | Single Port (1x1) | | **Ethernet Speed** | 10/100/1000 Base-T (Gigabit Ethernet) | | **Orientation** | Right Angle (Through-Hole) | | **Shielding** | Shielded with EMI Tabs | | **LEDs** | Integrated (Typically Green/Yellow) | | **Termination** | Solder | | **Mounting** | PCB Mount | --- ## 2. Key Internal Electronic Parts The "47DR" series is unique because it combines several discrete electronic functions into one housing: ### A. The Isolation Transformer This is the core functional part. It provides magnetic coupling between the PHY (Physical Layer) chip and the network cable. * **Galvanic Isolation:** Protects the circuitry from high-voltage surges on the Ethernet line. * **Signal Integrity:** Ensures clean data transmission over long distances. ### B. Common Mode Chokes These are small coils wrapped around a ferrite core. * **Noise Suppression:** They filter out electromagnetic interference (EMI) and radio frequency interference (RFI) without affecting the high-speed data signals. ### C. Termination Resistors and Capacitors Often referred to as "Bob Smith Termination." * **Impedance Matching:** Reduces signal reflections. * **Common Mode Voltage:** Helps dissipate common-mode noise to the chassis ground via a high-voltage capacitor (usually rated for 2kV). ### D. Integrated LEDs * The "1112" suffix usually denotes the specific LED configuration. These allow for visual status updates (Link/Activity) without requiring separate light pipes or board-mounted LEDs. --- ## 3. Physical Layout and Pinout The part generally follows a standard footprint to ensure compatibility with Ethernet controllers: 1. **Signal Pins:** Connect to the Ethernet Transceiver (PHY). 2. **Shield Tabs:** Connect to the chassis ground to bleed off static and noise. 3. **LED Pins:** Separate pins to drive the indicator lights. --- ## 4. Typical Applications * **Networking Equipment:** Routers, switches, and hubs. * **Industrial PC:** Embedded motherboards and PLC controllers. * **IoT Gateways:** Devices requiring reliable wired internet connectivity. ---