The **KWTS-5AD-R** is a specific model of a **Tactile Switch** (also known as a push-button switch or micro-switch). These components are widely used in consumer electronics, automotive controls, and industrial interfaces to provide momentary physical feedback to the user. --- ### 1. Technical Specifications The "KWTS" series typically follows standard industry specifications for small-form-factor switches. Below are the common parameters associated with this part number: | Parameter | Typical Value | | :--- | :--- | | **Switch Type** | Momentary Tactile Switch | | **Contact Arrangement** | SPST (Single Pole Single Throw) | | **Actuation Force** | 160gf to 250gf (grams-force) | | **Travel Distance** | 0.25mm ± 0.1mm | | **Voltage Rating** | 12V DC | | **Current Rating** | 50mA | | **Contact Resistance** | ≤ 100mΩ | | **Insulation Resistance** | ≥ 100MΩ (100V DC) | | **Life Expectancy** | 50,000 to 100,000 Cycles | --- ### 2. Breakdown of the Model Name While manufacturers may vary slightly, the nomenclature usually breaks down as follows: * **KWTS:** Series identifier (Manufacturer specific, often tactile/micro-switch). * **5A:** Likely refers to the physical dimensions (e.g., $5.2mm \times 5.2mm$ or similar base size). * **D:** Often denotes the stem height or the "Direction" (Top-actuated vs. Side-actuated). * **R:** Usually indicates **Tape and Reel** packaging (Surface Mount Device - SMD) for automated pick-and-place assembly. --- ### 3. Physical Construction The internal mechanism consists of four primary electronic/mechanical parts: 1. **The Cover:** Usually stainless steel or brass, protecting the internal mechanism. 2. **The Stem (Actuator):** The plastic part the user presses. Its height determines the "D" parameter in the part number. 3. **The Contact Dome:** A snap-action metal disc (usually phosphor bronze or stainless steel with silver plating). This provides the "click" sound and completes the electrical circuit. 4. **The Base:** A heat-resistant thermoplastic (LCP or Nylon) that houses the terminals. 5. **Terminals:** Metal leads (usually 4 pins) used for soldering to a PCB. --- ### 4. Application Circuit In most electronic circuits, the KWTS-5AD-R is used as a digital input. Because switches suffer from "contact bounce," a debouncing circuit or software delay is required. ```cpp // Example: Arduino logic for reading a KWTS-5AD-R switch const int buttonPin = 2; void setup() { pinMode(buttonPin, INPUT_PULLUP); // Use internal resistor } void loop() { int buttonState = digitalRead(buttonPin); if (buttonState == LOW) { // Switch is pressed, circuit is closed to ground } } ``` ---