The **M2REB-SA4-R2** is a specific technical component, most commonly identified as a high-density, high-speed connector assembly used in telecommunications, server hardware, and industrial automation. It belongs to the **M2REB series**. --- ## 1. Technical Specifications The "electronic parts" of this assembly are defined by its interface and mechanical construction. Below are the primary specifications: | Feature | Specification | | :--- | :--- | | **Component Type** | Board-to-Board / High-Speed Mezzanine Connector | | **Pin Configuration** | 4-Row Layout (SA4 Designation) | | **Mounting Type** | Surface Mount Technology (SMT) / Right-Angle | | **Contact Plating** | Gold (Au) over Nickel (Ni) for enhanced conductivity | | **Housing Material** | High-temperature thermoplastic (LCP - Liquid Crystal Polymer) | | **Operating Voltage** | Typically 30V - 125V AC/DC | | **Current Rating** | ~0.5A to 1.0A per contact (signal-dependent) | --- ## 2. Key Internal Components The assembly is composed of several critical electronic sub-parts: ### A. Contact Terminals * **Material:** Phosphor Bronze or Beryllium Copper. * **Function:** These are the conductive paths that carry electrical signals between two PCBs. The R2 variant signifies a specific revision of the contact geometry to reduce signal crosstalk at high frequencies. ### B. Dielectric Insulator * **Material:** Glass-filled LCP. * **Function:** This body holds the pins in precise alignment. It is designed to withstand reflow soldering temperatures (up to 260°C) and provides high insulation resistance to prevent short-circuiting between pins. ### C. Shielding (If applicable) * **Function:** Some variants include an outer metal shell to provide Electromagnetic Interference (EMI) protection, ensuring signal integrity for high-speed data transmission (e.g., PCIe Gen 3/4 or SATA). --- ## 3. Identification Code Breakdown Understanding the part number helps identify its electronic characteristics: * **M2REB:** Series identifier (Metric, high-density). * **SA:** Specific orientation/mating style (often Right Angle). * **4:** Indicates the number of rows or a specific size category. * **R2:** Revision 2; implies an update in mechanical durability or electrical performance compared to the original R1 version. --- ## 4. Typical Applications This component is generally found in: 1. **Server Blade Modules:** Connecting daughtercards to backplanes. 2. **Network Switches:** Handling high-speed data packets. 3. **Industrial Controllers:** Where space-saving right-angle connections are required. ---