The part number **A-DF25LL-TL-B-R** refers to a specific D-Subminiature connector manufactured by **ASSMANN WSW Components**. It is a high-reliability interface component commonly used for data transmission and power connections in industrial and computing environments. --- ### 1. Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Connector Type** | D-Subminiature (D-Sub) | | **Gender** | Female (Socket/Receptacle) | | **Number of Positions** | 25 Pins | | **Mounting Type** | Through-Hole, Right Angle | | **Termination** | Solder | | **Shell Size** | B (Standard 25-pin footprint) | | **Contact Finish** | Gold (Flash or thickness per spec) | | **Hardware** | Board Lock / Screwlock (TL variant) | | **RoHS Status** | Compliant (R suffix) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps identify the exact physical characteristics: * **A**: Assmann WSW brand prefix. * **DF**: D-Sub Female (Receptacle). * **25**: Number of contacts/pins. * **LL**: Low Profile / Specific housing dimensions. * **TL**: Typically refers to the mounting hardware (e.g., Threaded Locks or Board Locks) used to secure the connector to the PCB and the mating cable. * **B**: Black Insulator material (usually PBT thermoplastic). * **R**: RoHS Compliant. --- ### 3. Key Electronic & Mechanical Features #### A. Right-Angle Orientation This connector is designed to be mounted on a Printed Circuit Board (PCB) at a 90-degree angle. This is ideal for rear-panel IO on devices where cables need to plug in horizontally relative to the board. #### B. Durability and Conductivity * **Contacts:** Usually made of copper alloy with gold plating on the mating area to prevent oxidation and ensure low contact resistance over hundreds of mating cycles. * **Shell:** Steel construction, often tin or nickel-plated, providing Grounding and EMI/RFI shielding. #### C. Mounting Hardware The "TL" designation indicates that the part includes mechanical fasteners. This ensures that when a cable is plugged in, the mechanical stress is transferred to the connector's hardware rather than the solder joints, preventing traces from lifting. --- ### 4. Common Applications * **Industrial Automation:** PLCs and CNC machine interfaces. * **Telecommunications:** Network equipment and legacy console ports. * **Computing:** RS-232 serial communication or parallel printer ports. * **Medical Equipment:** Secure data logging interfaces.