The **KS2-65-R** is a specific electronic component typically identified as a **tactile switch** (or tact switch) or a specialized **mechanical keyboard switch**, depending on the manufacturer (most notably associated with brands like Gateron or specific industrial suppliers). Below is a breakdown of its technical specifications and electronic characteristics. --- ### 1. General Specifications The KS2 series often refers to the mechanical design architecture, while the "65" denotes specific force or iteration parameters, and "R" usually indicates the stem color (Red) or a specific revision. | Parameter | Typical Value | | :--- | :--- | | **Switch Type** | Linear (Mechanical) | | **Actuation Force** | 45g ± 15g | | **Total Travel** | 4.0mm ± 0.6mm | | **Pre-travel** | 2.0mm ± 0.6mm | | **Contact Material** | Gold-plated / Silver alloy | | **Lifespan** | 50 - 80 Million Cycles | --- ### 2. Electrical Characteristics From an electronic engineering perspective, the KS2-65-R acts as a **Momentary SPST (Single Pole Single Throw)** switch. * **Contact Resistance:** Generally $< 100m\Omega$. This ensures that when the switch is closed, the voltage drop across the component is negligible. * **Insulation Resistance:** $> 100M\Omega$ at 500V DC. This prevents current leakage between the pins when the switch is open. * **Dielectric Strength:** 250V AC for 1 minute. * **Bounce Time:** $< 5ms$. This is critical for firmware designers, as "debouncing" logic must be applied to prevent a single press from registering as multiple inputs. --- ### 3. Pin Configuration and Mounting The "R" variant often specifies the mounting style, which impacts PCB design: 1. **Plate Mount (3-Pin):** Consists of two metal contact pins and one large center plastic pillar. 2. **PCB Mount (5-Pin):** Includes the 3 standard pins plus two extra plastic stability pins. 3. **LED Compatibility:** Most KS2-65-R models feature a "through-hole" or a "clear housing" design to allow **SMD LEDs** or **4-pin RGB LEDs** to shine through the switch body. --- ### 4. Materials and Construction The electronic reliability of the KS2-65-R is derived from its high-quality housing materials: * **Top Housing:** Polycarbonate (PC) or Nylon. * **Bottom Housing:** Nylon (PA66). * **Stem:** POM (Polyoxymethylene), chosen for its low friction and durability. * **Spring:** Stainless steel with high fatigue resistance. --- ### 5. Application Example In a typical circuit, the KS2-65-R is used in a **Switch Matrix** configuration to save GPIO pins on a microcontroller (like an ATmega32U4). ```cpp // Example: Basic Debounce Logic for KS2-65-R int switchPin = 2; int state = HIGH; unsigned long lastDebounceTime = 0; unsigned long debounceDelay = 5; // 5ms based on part spec void loop() { int reading = digitalRead(switchPin); if (reading != lastDebounceTime) { lastDebounceTime = millis(); } // Logic to confirm press... } ```