The **M8CT1-5446-R** is a specialized electronic component, specifically a **Surface Mount (SMT) Transformer** designed for communication and networking applications. It is most commonly associated with T1/E1/CEPT/ISDN-PRI line interfaces. Below is a detailed breakdown of its electronic specifications and characteristics. ### 1. General Specifications This part belongs to a class of magnetic components used for signal isolation and impedance matching. | Parameter | Specification | | :--- | :--- | | **Component Type** | T1/E1 Isolation Transformer | | **Configuration** | Single Port / Octal (depending on exact housing) | | **Mounting Type** | Surface Mount Device (SMD/SMT) | | **Turns Ratio** | 1:1.14CT (Typical for this series) | | **RoHS Status** | Compliant (-R suffix indicates RoHS) | --- ### 2. Key Electrical Characteristics The "M8CT" series is engineered to handle high-frequency data transmission while providing safety isolation. * **Isolation Voltage:** Usually rated for **1500Vrms**, protecting sensitive logic circuitry from high-voltage surges on the line side. * **OCL (Open Circuit Inductance):** Typically ranges from **1.2mH to 2.0mH**, ensuring sufficient signal integrity for T1 (1.544 Mbps) and E1 (2.048 Mbps) speeds. * **Leakage Inductance:** Minimized (usually < 0.80 µH) to reduce signal distortion and ringing. * **Interwinding Capacitance ($C_{ww}$):** Kept very low (approx. 30-50 pF) to suppress common-mode noise. --- ### 3. Pinout and Internal Diagram While specific pinouts vary by manufacturer (like Bel Fuse or Pulse Electronics), the internal structure generally consists of: 1. **Primary Side:** Connected to the Transceiver (PHY) chip. 2. **Secondary Side:** Connected to the external line/connector. 3. **Center Tap (CT):** Used for DC biasing or grounding to improve common-mode rejection. ```mermaid graph LR A[Pin 1] --| | B[Pin 16] C[Pin 2] --| Transformer Coil |-- D[Pin 15] E[Pin 3] --| | F[Pin 14] style B stroke:#333,stroke-width:2px ``` *(Simplified representation of a single-channel isolation path)* --- ### 4. Common Applications This part is typically found in the following hardware: * **Telecommunications Infrastructure:** T1/E1 trunk cards. * **Networking Gear:** Router WAN interface cards (WICs). * **Access Gateways:** High-density integrated access devices. * **Digital Private Branch Exchange (PBX):** For digital telephony connections. --- ### 5. Identification Code Breakdown * **M8:** Often refers to the package size or the "Octal" nature (8-channel) in specific series. * **CT:** Indicates a **Center Tap** on the primary or secondary windings. * **5446:** The specific winding/electrical configuration code. * **-R:** Denotes **RoHS Compliance** (Lead-free).