The **W2CE-5D4-R2** is a specific part number belonging to the **W2CE series** of high-performance connectors, typically manufactured by companies like Win-Win (WCON). These are high-speed, edge-card style connectors often used in networking and telecommunications equipment. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electronic and physical characteristics: | Feature | Specification | |:---|:---| | **Connector Type** | Edge Card / High-Speed Mezzanine | | **Number of Pins** | 50 (indicated by '5D') | | **Pitch** | 0.8mm (Standard for W2CE series) | | **Orientation** | Right Angle or Vertical (Model dependent) | | **Mounting Type** | SMT (Surface Mount Technology) | | **Data Rate Support** | Up to 28Gbps or 56Gbps PAM4 | --- ### 2. Key Electronic Components & Features The design of the W2CE-5D4-R2 focuses on signal integrity and power distribution: * **Contact Material:** High-conductivity Copper Alloy, usually plated with Gold (Au) over Nickel to prevent oxidation and ensure low contact resistance. * **Insulator Material:** High-temperature LCP (Liquid Crystal Polymer), which is essential for surviving the heat of reflow soldering processes. * **Differential Pairs:** The internal pin layout is optimized for differential signaling, minimizing crosstalk (NEXT/FEXT) in high-speed data transmission. * **Impedance Control:** Designed to maintain a 100-ohm (or 85-ohm) differential impedance profile to prevent signal reflections. --- ### 3. Common Applications Due to its high density and high-speed capabilities, this part is commonly found in: 1. **SFP/QSFP Cages:** Serving as the internal interface for optical transceiver modules. 2. **Server Backplanes:** Connecting daughter cards to a main system board. 3. **Network Switches:** Used in high-bandwidth routing hardware. --- ### 4. PCB Footprint Example (Generic) When designing a PCB for this part, engineers typically use a land pattern similar to this structure: ```c // Design Constraints for W2CE series .pitch = 0.80mm; .pad_width = 0.35mm; .solder_mask_expansion = 0.05mm; .thermal_relief = "Required for ground pins"; ``` ---