The **57FFD-R** refers to a specific series of high-density, D-Subminiature connectors, most commonly associated with the **Amphenol** 57 Series (often used in Centronics or telecommunications interfaces). These parts are critical for establishing reliable multi-pin data connections in industrial and legacy computing environments. --- ### 1. Key Technical Specifications The "57" prefix generally denotes the series family, while "FFD" and "R" specify the physical configuration and compliance. | Feature | Specification | | :--- | :--- | | **Series** | 57 Series (Ribbon/Centronics style) | | **Connector Type** | Female (Receptacle) | | **Mounting Style** | Right Angle (R) / PCB Mount | | **Pin Count** | Typically 50-pin (standard for FFD telecomm) | | **Contact Plating** | Gold over Nickel (standard for reliability) | | **Termination** | Solder Tail (for through-hole PCB mounting) | --- ### 2. Physical Components & Materials The construction of the 57FFD-R is designed for durability and shielding against electromagnetic interference (EMI). * **Insulator:** Usually made of PBT (Polybutylene Terephthalate) reinforced with glass fiber, rated for UL94V-0 flammability. * **Contacts:** Phosphor bronze or copper alloy to ensure high conductivity and flexibility under repeated mating cycles. * **Shell:** Zinc-plated or Tin-plated steel, providing a rugged exterior and grounding path. * **Boardlocks:** Often features "R" (Right Angle) mounting brackets with integrated boardlocks to snap the part into a PCB before soldering. --- ### 3. Common Applications These connectors are widely used in specialized sectors rather than consumer electronics. * **Telecommunications:** Used in "Champ" or RJ21X interfaces for connecting 25-pair telephone lines to PBX systems. * **Industrial Automation:** High-density signal routing between controllers and sensory arrays. * **Legacy Computing:** SCSI interfaces and older parallel printing hardware often utilize the 57 series architecture. * **Medical Equipment:** Reliable data logging connections where a secure mechanical latch is required. --- ### 4. Dimensional Layout Example While exact dimensions vary by manufacturer, the **Right Angle (R)** variant follows a standard footprint: ```text Top View (PCB Footprint) _______________________________ | o o o o o o o o o o | <-- Row A (25 pins) | o o o o o o o o o o | <-- Row B (25 pins) |_______________________________| | | |___[Mounting Brackets]_____| ``` ---