The **KAC-AA2-R** refers to a specific type of **Tactile Switch** (also known as a push-button switch) manufactured by companies like E-Switch or similar electronic component providers. These are widely used in consumer electronics, instrumentation, and control panels. --- ### 1. Technical Specifications The electrical and mechanical characteristics define how the switch integrates into a circuit. | Parameter | Value (Standard) | | :--- | :--- | | **Circuit Type** | SPST (Single Pole Single Throw) | | **Switch Function** | Off-Mom (Momentary / Normally Open) | | **Contact Rating** | 50mA @ 12VDC | | **Contact Resistance** | 100 mΩ Max | | **Insulation Resistance** | 100 MΩ Min @ 100VDC | | **Dielectric Strength** | 250VAC for 1 minute | | **Operating Force** | Typically 160gf or 260gf | | **Travel** | 0.25mm ± 0.1mm | --- ### 2. Component Structure The "KAC" series typically features a **Right Angle, Surface Mount (SMD)** design. * **Actuator:** The physical button pressed by the user. * **Contact Dome:** A metal snap-dome that provides the "click" tactile feedback and completes the electrical circuit. * **Housing:** High-temperature plastic (often LCP) capable of withstanding reflow soldering temperatures. * **Terminals:** Silver or gold-plated leads designed for side-mounting on a PCB. --- ### 3. Key Features 1. **Right Angle Orientation:** The button is pressed parallel to the PCB, making it ideal for edge-mounted controls (like volume buttons on a smartphone or power buttons on a tablet). 2. **Tactile Feedback:** Provides a distinct physical "click" to confirm to the user that the switch has been actuated. 3. **Compact Footprint:** Designed for space-constrained applications. 4. **Tape and Reel Packaging:** Usually denoted by the "-R" suffix, indicating the parts are supplied on a reel for automated SMT (Surface Mount Technology) assembly lines. --- ### 4. Typical Applications These parts are commonly found in: * **Handheld Devices:** Mobile phones, remote controls, and handheld gaming consoles. * **Wearables:** Smartwatches and medical monitoring devices. * **Computers:** Reset buttons or power buttons on the sides of laptops/tablets. * **Industrial:** Interface buttons on small sensor modules. --- ### 5. Circuit Symbol In a schematic, the KAC-AA2-R is represented as a simple momentary switch: ```text / ----o/ o---- (Normally Open) ```