The **M2REB-R21-R** is a specific part number typically associated with high-speed, high-density mezzanine connectors, often found in the **Molex Mirror Mezz** series. These components are designed for high-performance computing, networking, and telecommunications equipment. --- ### 1. Technical Specifications Overview The "Mirror Mezz" architecture is unique because the connectors are **hermaphroditic**, meaning the same part number mates to itself. This simplifies inventory and design. | Feature | Specification (Typical) | | :--- | :--- | | **Connector Type** | Hermaphroditic Mezzanine Connector | | **Data Rate** | Up to 56 Gbps (NRZ) or 112 Gbps (PAM4) | | **Pin Count** | 21 Rows (High density) | | **Mating Orientation** | Board-to-Board (Parallel) | | **Termination Style** | Surface Mount (SMT) with BGA (Ball Grid Array) | | **Stack Heights** | Variable (based on mated pair combinations) | --- ### 2. Key Electronic Features #### A. Hermaphroditic Design Unlike standard "Male/Plug" and "Female/Receptacle" systems, the M2REB-R21-R mates with an identical connector. This ensures: * Reduced Part Numbers (SKUs) in the supply chain. * Symmetrical signal routing. #### B. Signal Integrity (SI) These parts are engineered for ultra-high-speed data transmission. They utilize: * **Stitched Header Pins:** To maintain impedance control. * **Grounding Shields:** Integrated internal shielding to minimize crosstalk between differential pairs. * **Low Insertion Loss:** Optimized for OCP (Open Compute Project) and AI server environments. #### C. BGA Attachment The connector uses a **Ball Grid Array (BGA)** interface for the PCB attachment. This provides: * Robust mechanical stability. * Short electrical paths, which are critical for 112G performance. --- ### 3. Application Use Cases Due to its high pin density and speed, this part is commonly used in: 1. **AI & Machine Learning:** Connecting GPU modules to baseboards. 2. **Server Architecture:** High-speed riser cards or processor-to-processor interconnects. 3. **Network Switches:** High-bandwidth backplanes. --- ### 4. Part Number Breakdown (Generic Structure) While specific to the manufacturer's internal coding, the suffix/prefix usually denotes: * **M2:** Mirror Mezz Series. * **R21:** Indicates the row count (21 rows). * **-R:** Often refers to Tape and Reel packaging for automated assembly.