The term **EB-RJ45** typically refers to an **RJ45 Ethernet Breakout Board**. These components are essential in prototyping and industrial design for converting a standard 8P8C (8 position, 8 contact) modular connector into a format that is easy to wire or breadboard. Below is an explanation of the electronic parts and specifications associated with these modules. --- ### 1. Anatomy of an EB-RJ45 Module An EB-RJ45 consists of several distinct electronic elements: | Component | Description | Function | | :--- | :--- | :--- | | **RJ45 Jack** | The physical female socket (8P8C). | Accepts standard Ethernet cables (Cat5e/Cat6). | | **PCB (Printed Circuit Board)** | The fiberglass substrate (usually FR-4). | Routes the tiny pins of the jack to larger, accessible pads. | | **Pin Headers** | 0.1" (2.54mm) pitch male or female headers. | Allows connection to breadboards or jumper wires. | | **Mounting Holes** | Pre-drilled holes in the PCB corners. | Used for securing the board to an enclosure or chassis. | | **Trace Elements** | Copper paths on the board. | Designed to handle differential signaling with minimal interference. | --- ### 2. Pinout Configuration Since EB-RJ45 boards are "breakouts," they map the 8 pins of the Ethernet cable directly to a terminal block or header. The standard mapping follows the **TIA/EIA-568** wiring: | Pin Number | Signal (T568B Standard) | Wire Color | | :--- | :--- | :--- | | **1** | Transmit + (TX+) | Orange/White | | **2** | Transmit - (TX-) | Orange | | **3** | Receive + (RX+) | Green/White | | **4** | Blue | Blue | | **5** | Blue/White | Blue/White | | **6** | Receive - (RX-) | Green | | **7** | Brown/White | Brown/White | | **8** | Brown | Brown | | **Shield** | Ground / Chassis | Metal Housing (if applicable) | --- ### 3. Technical Specifications When selecting or using an EB-RJ45, consider these electronic characteristics: * **Voltage Rating:** Typically rated up to **125V AC/DC**. * **Current Rating:** Usually **1.5A per contact**, sufficient for Power over Ethernet (PoE). * **Contact Resistance:** Often `< 20mΩ`. * **Insulation Resistance:** Usually `> 500MΩ`. * **Shielding:** Many EB-RJ45s feature a "Shielded" (STP) jack to prevent Electromagnetic Interference (EMI), whereas others are "Unshielded" (UTP). --- ### 4. Common Applications * **Prototyping:** Testing Ethernet communication on Arduino, Raspberry Pi, or ESP32. * **Custom Cabling:** Using Ethernet cable as a cheap way to carry 8 low-voltage signals (e.g., sensor data) over long distances. * **Repair:** Replacing a damaged RJ45 port in a device without replacing the entire mainboard.