The part number **A-DFF09LPIII-FP-R** refers to a high-density, low-profile D-Sub connector typically manufactured by **Assmann WSW Components**. This specific part is designed for PCB mounting and is often used in applications where vertical space is limited. --- ### 1. Technical Specifications Breakdowns The alphanumeric code follows a specific nomenclature that defines the physical and electrical characteristics of the part: | Attribute | Specification | Description | | :--- | :--- | :--- | | **Connector Type** | D-Sub | Standard interface for data and power signals | | **Gender** | Female (Socket) | Receptacle interface with 9 contact points | | **Number of Pins** | 09 | Standard 9-pin configuration (DE-9) | | **Profile** | Low Profile (LP) | Reduced height for compact electronic enclosures | | **Mounting Style** | Right Angle / PCB | Designed to sit flat on a PCB with pins bent 90° | | **Termination** | Solder | Through-hole technology (THT) for permanent mounting | | **Plating** | Flash Gold | Provides corrosion resistance and reliable conductivity | | **RoHS Status** | Compliant (-R) | Lead-free and environmentally friendly materials | --- ### 2. Key Physical Features * **Low Profile (III):** The "III" often designates a specific height category or revision in the Assmann series, ensuring the connector doesn't interfere with top-side components or slim chassis covers. * **Front Panel Mounting (FP):** This version usually includes features for securing the connector to the device's exterior casing (the front panel), such as threaded inserts or specialized brackets. * **Metal Shell:** Typically features a tin-plated steel shell for EMI/RFI shielding, ensuring signal integrity in noisy environments. --- ### 3. Common Applications Due to its 9-pin female configuration and low-profile design, this part is frequently found in: 1. **Industrial Controllers:** Serial communication interfaces (RS-232/RS-485). 2. **Embedded Systems:** Diagnostic ports on small-form-factor motherboards. 3. **Telecommunications:** Network management ports. 4. **Medical Equipment:** Data logging and sensor interfacing where space is at a premium. --- ### 4. Footprint and Layout When designing a PCB for this part, engineers must account for: * **Pitch:** The distance between pins (Standard D-Sub spacing). * **Row Spacing:** The distance between the two rows of pins on the PCB footprint. * **Mounting Holes:** Large holes for the mechanical "ears" or ground-straps that provide structural stability.