The **M2AS1-6311-R2** is a high-performance **Magnetic RJ45 Connector** (often referred to as a "MagJack") manufactured by **UDE (Universal Microelectronics)**. It is designed to integrate the physical mechanical connection and the necessary electrical isolation components into a single package. --- ### 1. Key Technical Specifications Below is a summary of the electrical and physical characteristics of the M2AS1-6311-R2: | Feature | Specification | | :--- | :--- | | **Connector Type** | RJ45 with Integrated Magnetics | | **Speed/Protocol** | 10/100/1000 Base-T (Gigabit Ethernet) | | **Number of Ports** | Single Port (1x1) | | **Orientation** | Right Angle (Tab-Down) | | **Termination** | Through-Hole (THT) | | **LED Configuration** | Typically Green/Yellow (Bi-color options vary by suffix) | | **Shielding** | Metal Shield with EMI fingers | --- ### 2. Internal Electronic Components The "Magic" inside this connector involves several passive electronic components integrated within the plastic housing: #### A. Isolation Transformers * **Purpose:** Provides 1500V AC isolation between the Ethernet cable and the PHY (Physical Layer) chip. * **Function:** Protects the internal circuitry from voltage spikes and static on the network line. #### B. Common Mode Chokes (CMC) * **Purpose:** Filters out high-frequency noise that is common to both signal lines. * **Effect:** Significantly reduces Electromagnetic Interference (EMI) to ensure compliance with FCC and CE standards. #### C. Bob Smith Termination * **Purpose:** A network of resistors (typically 75Ω) and capacitors. * **Function:** Terminates unused wire pairs and provides a path for common-mode currents to ground, reducing noise emissions. --- ### 3. Pinout and Integration When designing a PCB for this part, the pinout is divided into two sides: 1. **Cable Side (Front):** Standard 8-pin RJ45 interface for Cat5e/Cat6 cables. 2. **PCB Side (Rear):** * **Signal Pins:** Connect directly to the Ethernet PHY chip. * **LED Pins:** Connect to the status output pins of the MCU or PHY. * **Shield Tabs:** Connected to Chassis Ground for EMI protection. --- ### 4. Typical Application Circuit The following represents the basic connection logic: ```c [ Ethernet PHY Chip ] <---> [ M2AS1-6311-R2 (Magnetics) ] <---> [ RJ45 Cable ] | | (Differential Pairs) (Isolated Signal) | | (TX+/-, RX+/-) (Transformers/Chokes) ``` ---