The **JM-14B-R** is a specific electronic component typically identified as a **tactile switch** (often manufactured by companies like Mitsumi or similar domestic Asian manufacturers). It is a momentary pushbutton switch designed for low-power signal switching on Printed Circuit Boards (PCBs). ### Technical Specifications The following table highlights the general electrical and mechanical characteristics typical for the JM-14 series: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile / Momentary (Normally Open) | | **Mounting Type** | Surface Mount (SMD) or Through-Hole (Model dependent) | | **Current Rating** | 50mA | | **Voltage Rating** | 12V DC | | **Contact Resistance** | < 100 mΩ | | **Insulation Resistance** | > 100 MΩ | | **Operating Force** | 1.6N to 2.5N (Typical) | | **Lifespan** | 100,000+ cycles | --- ### Internal Electronic Structure The "R" suffix often denotes the packaging style (e.g., **Tape & Reel**) or a specific mechanical orientation (e.g., **Right Angle**). 1. **Contact Mechanism**: It uses a metal snap-dome. When the plunger is pressed, the dome deforms and bridges two traces on the PCB, completing the circuit. 2. **Housing**: Usually made of high-temperature thermoplastic (LCP or Nylon) to withstand reflow soldering temperatures. 3. **Terminals**: Silver-plated brass or copper alloy to ensure high conductivity and oxidation resistance. ### Common Applications The JM-14B-R is found in consumer electronics where space is limited and user feedback (a "click") is required: * **Household Appliances**: Microwave control panels, washing machine interfaces. * **Computing**: Reset buttons on routers, power buttons on monitors. * **Industrial**: PLC input triggers and handheld testing equipment. ### Schematic Representation In a circuit diagram, the part is represented as a simple momentary switch: ```text (Pin 1) ----/ ---- (Pin 2) Switch ``` ---