The **KUS-22-R** is an electronic component, specifically identified as a **tactile switch** (or tact switch) commonly manufactured by companies like Mitsumi or similar electronics vendors. These are used in consumer electronics, automotive controls, and industrial interfaces. --- ### 1. General Specifications The KUS-22-R belongs to a category of surface-mount devices (SMD) designed for high reliability and a low profile. | Parameter | typical Specification | | :--- | :--- | | **Type** | Tactile Switch (Momentary) | | **Mounting Type** | Surface Mount (SMD / SMT) | | **Circuit Type** | SPST (Single Pole, Single Throw) | | **Switching Current** | ~50mA | | **Switching Voltage** | ~12V DC | | **Operating Force** | Typically 1.6N to 2.5N | --- ### 2. Key Electronic Features #### A. Contact Mechanism The "R" in the suffix often denotes specific characteristics like **RoHS compliance** or **packaging (Reel)**. Internally, it uses a metal dome contact. When the actuator is pressed, the dome collapses to bridge two traces on the PCB, completing the circuit. #### B. Tactile Feedback The switch provides "haptic" feedback. This is an electronic-mechanical interaction where the user feels a "click" when the contact is made, ensuring the input has been registered without needing to look at the device. #### C. Durability and Life Cycle * **Mechanical Life:** These parts are typically rated for 100,000 to 500,000 cycles. * **Contact Resistance:** Usually very low (under 100mΩ) to ensure signal integrity for microcontrollers. --- ### 3. Application Circuit Example In most electronic designs, the KUS-22-R is used as an input to a GPIO pin on a microcontroller. ```cpp // Typical Arduino-style logic for a tactile switch const int buttonPin = 2; void setup() { // Use internal pull-up resistor to keep pin HIGH pinMode(buttonPin, INPUT_PULLUP); } void loop() { int sensorVal = digitalRead(buttonPin); if (sensorVal == LOW) { // Switch is pressed, circuit is grounded } } ``` --- ### 4. Physical Layout The KUS-22-R usually features a small square footprint with "gull-wing" leads for soldering. * **Dimensions:** Often 6.0mm x 6.0mm or smaller (sub-miniature). * **Sealing:** Depending on the specific sub-model, it may have a dust-proof seal to protect the internal copper/silver contacts.