The **27DS-R-PC** refers to a specific series of high-density, D-Sub (D-Subminiature) connectors, typically manufactured by companies like **Hirose Electric** or **Kycon**. These parts are widely used for signal transmission in telecommunications, computing, and industrial control systems. --- ### 1. Key Technical Specifications The part number usually encodes specific mechanical and electrical properties. Below is a breakdown of the standard specifications for this series: | Feature | Specification | | :--- | :--- | | **Connector Type** | D-Subminiature (High Density) | | **Number of Positions** | 27 Pins | | **Gender** | Receptacle (Female) | | **Termination Style** | Through-hole (PC Tail / Right Angle) | | **Mounting Type** | PCB Mount (Right Angle) | | **Contact Plating** | Gold (typically over Nickel) | | **Current Rating** | 1A to 3A (depending on manufacturer) | | **Voltage Rating** | 250V AC/DC | --- ### 2. Component Breakdown The suffix and prefix in "27DS-R-PC" provide details on the physical construction: * **27**: Indicates the pin count. * **DS**: Stands for "D-Sub." * **R**: Indicates it is a **Receptacle** (Socket/Female connector). * **PC**: Refers to **PC Board** mounting, specifically for soldering into a printed circuit board. --- ### 3. Applications These connectors are chosen for their durability and EMI shielding capabilities. Common use cases include: * **Modems and Networking:** Interfacing between communication hardware. * **Industrial Automation:** Connecting PLCs (Programmable Logic Controllers) to sensors. * **Video Interfaces:** Older VGA-style or proprietary video signal routing. * **Medical Equipment:** Reliable signal connections for diagnostic machinery. --- ### 4. PCB Footprint Example When designing a PCB for this part, the footprint typically follows a staggered grid to accommodate the high density of pins in a small D-shell size. ```cpp // Example: Typical Pin Configuration for 27-Pin High Density Row 1: Pins 1 - 9 Row 2: Pins 10 - 18 Row 3: Pins 19 - 27 // Note: Pins are often spaced at 2.29mm horizontally // and 1.98mm vertically (staggered). ``` --- ### 5. Selection Considerations When sourcing this part, pay attention to these variables: 1. **Mounting Hardware:** Does it require threaded inserts (4-40) or fixed board locks? 2. **Shell Finish:** Steel shells are often tin-plated for grounding efficiency. 3. **Temperature Range:** Standard parts operate between -55°C and +105°C.