The **JR-55-R/Q** refers to a specific series of high-quality **DC Power Jacks** (Power Supply Connectors) commonly used in consumer electronics, telecommunications, and industrial equipment. These parts are typically manufactured by specialized electronic component firms like *Jiliang* or *Lumberg*. --- ### ## Technical Specifications The "R" and "Q" designations often refer to the mounting orientation (Right Angle vs. Straight) or the specific pin diameter. | Feature | Specification (Typical) | | :--- | :--- | | **Component Type** | DC Power Jack / Power Socket | | **Mounting Type** | Through-hole (PCB Mount) | | **Contact Resistance** | ≤ 30mΩ | | **Insulation Resistance** | ≥ 100MΩ (DC 500V) | | **Withstand Voltage** | AC 500V (50Hz) for 1 minute | | **Rated Load** | DC 30V / 0.5A - 2.0A (varies by sub-model) | | **Insertion Force** | 3N – 20N | | **Life Cycle** | 5,000 cycles minimum | --- ### ## Pin Configuration and Design The JR-55 series is categorized as a **3-pin** or **2-pin** barrel connector system. 1. **Center Pin (Positive/Negative):** Usually provides the main power path. Common diameters are 2.1mm or 2.5mm. 2. **Shunt/Switch Terminal:** Many versions include a "normally closed" internal switch. When a plug is inserted, it breaks the connection to this terminal, allowing the device to switch automatically from internal battery power to an external DC adapter. 3. **Solder Tabs:** Flat, sturdy metal legs designed to be soldered into a Printed Circuit Board (PCB). --- ### ## Material Composition To ensure durability and heat resistance during soldering, the following materials are used: * **Housing:** High-temperature thermoplastic (usually PBT or PA66, UL94V-0 rated). * **Terminals:** Copper alloy or Brass. * **Plating:** Silver or Gold plating over Nickel for superior conductivity and oxidation resistance. --- ### ## Differences between R and Q Variants While manufacturers have specific internal codes, generally: * **JR-55-R:** Usually denotes a **Right-Angle** PCB mount, where the plug enters parallel to the board. * **JR-55-Q:** Often denotes a specific **Pin Diameter** variation or a **Vertical/Straight** mount orientation. --- ### ## Common Applications * **Laptops/Tablets:** Power input port. * **Audio Equipment:** Digital mixers and amplifiers. * **IoT Devices:** Smart home hubs requiring constant DC power. * **Chargers:** Cradles for cordless tools or appliances.