The **WJM-111-R** is a specific electronic component typically categorized as a **Surface Mount (SMT) Micro Switch** or a **Tactile Switch**, commonly used in consumer electronics, automotive controls, and industrial interfaces. Below is a breakdown of its technical specifications and electronic characteristics. --- ### 1. Technical Specifications The following table outlines the typical electrical and mechanical properties of the WJM-111-R series: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile / Momentary Push Button | | **Mounting Type** | Surface Mount Device (SMD/SMT) | | **Contact Rating** | DC 12V / 50mA (Typical) | | **Contact Resistance** | ≤ 100mΩ | | **Insulation Resistance** | ≥ 100MΩ (at 100V DC) | | **Dielectric Strength** | 250V AC for 1 minute | | **Operating Force** | 160gf to 250gf (varies by sub-model) | | **Travel Distance** | 0.25mm ± 0.1mm | | **Operating Life** | 50,000 to 100,000 cycles | --- ### 2. Physical Construction The "R" suffix often denotes **Reel packaging** (Tape & Reel) for automated pick-and-place assembly, or a specific **Right-angle** orientation. * **Housing:** High-temperature thermoplastic (LCP or Nylon) to withstand reflow soldering. * **Contacts:** Silver-plated or Gold-plated copper alloy for high conductivity and oxidation resistance. * **Actuator:** A small "stem" or button that the user presses. * **Terminals:** Gulls-wing or J-bend leads designed for SMT soldering. --- ### 3. Common Applications Due to its small footprint and reliability, the WJM-111-R is used in: * **Consumer Electronics:** Volume buttons on smartphones, power buttons on tablets. * **Automotive:** Key fobs, dashboard control panels. * **Wearables:** Smartwatches and fitness trackers. * **Peripherals:** Computer mice, reset buttons on routers. --- ### 4. Circuit Diagram Representation In a schematic, this part is represented as a normally open (NO) single-pole single-throw (SPST) switch. ```text [ Terminal 1 ] ----\ ---- [ Terminal 2 ] \ (Button) ``` ---