The **M2AS1-4244-R** is an electronic component manufactured by **SST (Solid State Turnkey)** or associated vendors, typically identified as a **high-speed Ethernet Transformer (Magnetic Module)**. These components are essential in networking hardware to provide galvanic isolation and signal conditioning. --- ### 1. Component Overview This part is a **Discrete LAN Magnetic Module**, specifically designed for **10/100/1000 Base-T** (Gigabit Ethernet) applications. It acts as the interface between the Ethernet PHY (Physical Layer) chip and the RJ45 connector. ### 2. Technical Specifications The following table outlines the typical electrical characteristics for this series: | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | Ethernet Transformer / Magnetic Module | | **Channels** | Single Port (4-pair) | | **Speed** | 10/100/1000 Base-T (Gigabit) | | **Turns Ratio** | 1:1 (Transmitter & Receiver) | | **Isolation Voltage** | 1500 Vrms (Minimum) | | **OCL (Open Circuit Inductance)** | 350 µH Min @ 100kHz, 0.1V | | **Insertion Loss** | -1.1 dB Max (1-100 MHz) | | **Return Loss** | -18 dB Min (1-30 MHz) | | **Package Type** | Surface Mount (SMD) | --- ### 3. Key Electronic Functions The M2AS1-4244-R performs four critical roles in a circuit: 1. **Galvanic Isolation:** It protects the delicate PHY chip and internal circuitry from external voltage spikes or ground loops occurring over the Ethernet cable. 2. **Impedance Matching:** It ensures that the differential signals from the PHY chip match the 100-ohm characteristic impedance of the Twisted Pair (UTP) cable. 3. **Common Mode Rejection:** The internal common-mode chokes suppress electromagnetic interference (EMI) and noise. 4. **Signal Shaping:** It maintains the integrity of high-speed data pulses over long distances (up to 100 meters). ### 4. Typical Pinout Configuration While specific datasheets should be consulted for PCB layout, these modules generally follow a standard 24-pin SMD footprint: * **Pins 1-12 (LAN Side):** Connect directly to the RJ45 connector pins. * **Pins 13-24 (PHY Side):** Connect to the Ethernet Controller/PHY chip, often incorporating center taps for DC bias. --- ### 5. Common Applications * Network Interface Cards (NICs). * Industrial Switches and Routers. * Embedded Single Board Computers (SBCs). * Set-top boxes and IP cameras.