The **KPAU-B2MB-R** is a specific surface-mount (SMD) tactile switch often utilized in consumer electronics, automotive interfaces, and industrial controls. It belongs to the category of electromechanical components designed for user input. --- ### 1. General Specifications The KPAU series is characterized by its compact footprint and high reliability. Below are the typical technical parameters for this part: | Feature | Specification | | :--- | :--- | | **Component Type** | Tactile Switch (Push Button) | | **Mounting Type** | Surface Mount Device (SMD/SMT) | | **Circuit Type** | SPST (Single Pole Single Throw) | | **Switch Function** | Momentary (Normally Open) | | **Operating Force** | Typically 1.6N to 2.5N (160gf - 250gf) | | **Contact Rating** | 50mA @ 12V DC | | **Travel distance** | ~0.25 mm | --- ### 2. Key Electronic Characteristics * **Momentary Action:** The switch only completes the circuit while the button is physically depressed. Once released, the internal spring mechanism returns the contact to the "Open" position. * **Contact Resistance:** Typically very low (under 100mΩ), ensuring minimal signal loss or heat generation during activation. * **Insulation Resistance:** Designed to withstand high voltage (usually 100MΩ min at 100V DC) to prevent leakage between terminals. * **Tactile Feedback:** The "B" in the series often denotes the specific haptic "click" feel provided by the internal metal dome. --- ### 3. Physical Construction The part suffix codes (B2MB-R) usually indicate specific packaging and orientation: 1. **Terminals:** Usually features "J-bend" or "Gull-wing" leads for SMT soldering. 2. **Actuator:** A small rubber or plastic plunger that transmits force to the internal metal dome. 3. **The "-R" Suffix:** Typically signifies **Tape & Reel** packaging, which is essential for automated pick-and-place assembly machines. 4. **Sealing:** These switches are often dust-resistant, though specific IP ratings depend on the exact sub-variant. --- ### 4. Typical Application Circuit In digital electronics, this switch is commonly used as a "Reset" or "Function" button connected to a Microcontroller (MCU). ```cpp // Example: Simple Arduino Pull-up Configuration void setup() { pinMode(2, INPUT_PULLUP); // Connect KPAU switch between Pin 2 and Ground } void loop() { int buttonState = digitalRead(2); if (buttonState == LOW) { // Switch is pressed } } ``` ---