The **3112-R** refers to a specific series of high-performance **Micro-D connectors**, typically manufactured by companies like **Glenair** or **ITT Cannon**. These connectors are designed for applications requiring high density, extreme reliability, and resistance to environmental stress. --- ### 1. Key Technical Specifications The "3112-R" designation usually points to a rectangular, rack-and-panel, or cable-mounted micro-miniature connector. | Feature | Specification | | :--- | :--- | | **Contact Pitch** | 0.050 inch (1.27 mm) | | **Current Rating** | 3 Amps maximum | | **Operating Temperature** | -55°C to +150°C | | **Dielectric Withstanding Voltage** | 600 VAC at sea level | | **Insulation Resistance** | 5000 Megohms minimum | | **Contact Resistance** | 8 Milliohms maximum | --- ### 2. Core Electronic Components The 3112-R series is comprised of several critical sub-components that ensure electrical integrity: * **Twist Pin Contacts:** Unlike standard stamped contacts, these use a "bundle" of spring wires (often gold-plated) that provide multiple points of contact, ensuring a stable connection even under high vibration. * **Insulator Body:** Usually made from **Liquid Crystal Polymer (LCP)** or Polyphenylene Sulfide (PPS). These materials offer high dielectric strength and dimensional stability. * **Shell Material:** Typically aluminum alloy (often plated with electroless nickel or cadmium) which provides **EMI/RFI shielding** and mechanical protection. * **Interfacial Seal:** A fluorosilicone rubber seal that prevents moisture or contaminants from entering the contact area when mated. --- ### 3. Part Number Breakdown (Example) While specific manufacturers vary, the 3112-R nomenclature usually follows this logic: 1. **Series (311):** Identifies the Micro-D family. 2. **Mounting/Style (2):** Often indicates a specific mounting hardware (e.g., float mounts or threaded inserts). 3. **RoHS Compliance (R):** The "R" suffix specifically denotes that the part is **RoHS Compliant**, meaning it is manufactured without hazardous substances like lead or hexavalent chromium. --- ### 4. Applications Due to their rugged nature, these electronic parts are found in: * **Aerospace:** Flight control systems and cockpit instrumentation. * **Defense:** Missile guidance systems and tactical radios. * **Medical:** High-end diagnostic imaging equipment. * **Downhole Drilling:** Sensors used in high-temperature oil and gas exploration.