The **KFS-A13-R/Q** is a specific model of a **Miniature Tactile Switch** (push-button) commonly used in consumer electronics, automotive interfaces, and PCB-mounted control panels. Below is a detailed breakdown of its electronic components, specifications, and physical properties. --- ### 1. Component Overview The KFS-A13-R/Q is a mechanical switch designed to complete an electrical circuit when the plunger is pressed. It is categorized as a **Single Pole Single Throw (SPST)**, Normally Open (NO) switch. | Feature | Specification / Detail | | :--- | :--- | | **Switch Type** | Tactile / Momentary Push Button | | **Circuit Configuration** | SPST-NO (Single Pole Single Throw, Normally Open) | | **Mounting Type** | Through-hole (DIP) or Surface Mount (depending on suffix) | | **Feedback** | Auditory "click" and haptic tactile bump | --- ### 2. Electrical Specifications These parameters define the safe operating limits for the electronic part: * **Current Rating:** Typically **50mA**. * **Voltage Rating:** **12V DC**. * **Contact Resistance:** $\le 100 \text{ m}\Omega$ (initial). * **Insulation Resistance:** $\ge 100 \text{ M}\Omega$ at 100V DC. * **Dielectric Strength:** 250V AC for 1 minute. --- ### 3. Physical Parts and Construction The switch is comprised of four main internal components: 1. **The Cover (Top Plate):** Usually made of metal (stainless steel or tin-plated brass) to protect the internal dome. 2. **The Plunger (Actuator):** The plastic button that the user presses. In the A13 series, this is usually a square or round stem. 3. **The Contact Dome:** A snap-action metal disc. This is the "heart" of the switch; it provides the tactile feel and bridges the contacts when compressed. 4. **The Base (Housing):** A heat-resistant molded plastic (LCP or PBT) that holds the terminals. 5. **Terminals:** Silver-plated brass pins that are soldered to the PCB. --- ### 4. Part Number Decoding (KFS-A13-R/Q) While manufacturers vary slightly, the suffix typically indicates packaging or force: * **KFS-A13:** The series/form factor (standard height and footprint). * **R/Q:** Usually refers to the **Operating Force** (measured in Gram-force or Newtons) or the **Packaging Type** (Tape & Reel vs. Bulk). * *Example:* 160gf (standard) vs. 250gf (high force). --- ### 5. Application Circuit Example A common use for this part is as a digital input for a microcontroller (like an Arduino or ESP32). ```cpp // Typical Arduino Wiring for a Tactile Switch const int buttonPin = 2; int buttonState = 0; void setup() { // Uses the internal 10k resistor to prevent floating signals pinMode(buttonPin, INPUT_PULLUP); } void loop() { buttonState = digitalRead(buttonPin); if (buttonState == LOW) { // Switch is pressed (circuit closed to Ground) } } ``` ---