The **WJT-322-R** is a specific electronic component typically categorized as a **Surface Mount (SMT) Micro Switch** or a **Tactile Push Button Switch**. These components are widely used in consumer electronics, automotive controls, and industrial interfaces due to their compact size and reliable tactile feedback. --- ## 1. Technical Specifications The electrical and physical characteristics of the WJT-322-R define its performance limits. | Feature | Specification | | :--- | :--- | | **Switch Type** | Tactile / Momentary Push Button | | **Mounting Style** | Surface Mount Device (SMD/SMT) | | **Contact Arrangement** | SPST (Single Pole Single Throw) | | **Voltage Rating** | 12V DC (Typical) | | **Current Rating** | 50mA | | **Actuation Force** | 160gf to 250gf (grams-force) | | **Travel Distance** | 0.25mm ± 0.1mm | | **Durability** | 50,000 to 100,000 Cycles | --- ## 2. Key Electronic Components The internal structure of the WJT-322-R consists of several layers that work together to complete the circuit: ### A. The Actuator (Stem) The top part of the switch that the user presses. In the "R" variant, this is often a rubberized or reinforced plastic plunger designed to transfer force to the internal metal dome. ### B. The Metal Contact Dome This is the heart of the switch. When pressed: * It collapses, creating the "click" sound and tactile feel. * It bridges the gap between the stationary terminals, allowing current to flow. ### C. Terminals (Leads) The WJT-322-R features SMT leads (usually 4 pins). * Two pins are typically connected internally to provide mechanical stability on the PCB. * The leads are gold or silver-plated to ensure high conductivity and prevent oxidation. --- ## 3. Circuit Application In a standard electronic circuit, the WJT-322-R acts as a digital input trigger. ```cpp // Example: Arduino Pseudo-code for WJT-322-R Input const int switchPin = 2; // Connected to the WJT-322-R void setup() { pinMode(switchPin, INPUT_PULLUP); // Use internal resistor } void loop() { int buttonState = digitalRead(switchPin); if (buttonState == LOW) { // Switch is pressed, circuit is closed executeAction(); } } ``` --- ## 4. Common Use Cases * **Consumer Electronics:** Power buttons on smartphones, volume rockers, or Bluetooth headsets. * **Computer Peripherals:** Reset buttons on routers or mode-switching on mice. * **Industrial:** User interface panels for PLCs (Programmable Logic Controllers).