The part number **A-2004-3-4-R** typically refers to a specific type of **Modular Jack (RJ-series) connector**, specifically a standard **RJ11/RJ12 low-profile connector** often manufactured by companies like Assmann WSW Components. Below is a breakdown of its technical specifications and physical characteristics. --- ## 1. Technical Specifications The A-2004-3-4-R is a right-angle, through-hole PCB mount connector commonly used in telecommunications and data networking. | Feature | Specification | | :--- | :--- | | **Connector Type** | Modular Jack (RJ11 / RJ12) | | **Number of Positions** | 6 Positions | | **Number of Contacts** | 4 Contacts Loaded (6P4C) | | **Mounting Type** | Through-Hole, Right Angle (90°) | | **Shielding** | Unshielded | | **Contact Material** | Phosphor Bronze | | **Plating** | Gold over Nickel (contact area) | | **Housing Material** | Thermoplastic (UL94V-0 rated) | --- ## 2. Key Features * **6P4C Configuration:** While the housing has 6 slots (positions), only the middle 4 are populated with metal contacts. This is the standard configuration for basic telephone lines. * **Low Profile:** Designed to take up minimal vertical space on a Printed Circuit Board (PCB). * **Side Entry:** The cable plugs in parallel to the PCB (Right Angle), making it ideal for devices with thin enclosures. * **RoHS Compliant:** The "R" at the end of the part number usually signifies **RoHS compliance**, meaning it is free from hazardous substances like lead. --- ## 3. Application Use Cases These connectors are widely used in legacy and modern communication hardware: 1. **Telecommunications:** Standard telephone wall jacks and landline phones. 2. **Modems/Routers:** ADSL connections and dial-up networking. 3. **Industrial Controls:** Used for simple serial data transmission between controllers. 4. **Security Systems:** Connection points for alarm sensors and control panels. --- ## 4. PCB Footprint (Typical) If you are designing a PCB for this part, the standard layout involves: * **Pitch:** 1.02mm between contacts. * **Lead Spacing:** Usually 2.54mm or 3.81mm depending on the specific series footprint. * **Hole Diameter:** Typically 0.9mm for the signal pins and 2.4mm - 3.2mm for the plastic mounting pegs/posts.