The **BS-3A13-R** is a high-performance **Tactile Switch** (also known as a push-button switch) manufactured by companies like Boshuo. It is a surface-mount device (SMD) commonly used in consumer electronics for user interface control. --- ### 1. Key Technical Specifications Below are the primary electrical and mechanical characteristics of the BS-3A13-R: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile (Momentary) | | **Mounting Type** | SMD (Surface Mount Device) | | **Operating Force** | 160gf or 250gf (Standard variants) | | **Contact Rating** | 50mA, 12V DC | | **Insulation Resistance** | 100MΩ min. 100V DC | | **Dielectric Strength** | 250V AC for 1 minute | | **Travel** | 0.25mm ± 0.1mm | | **Operating Life** | 100,000 to 500,000 cycles | --- ### 2. Physical Construction The part is designed for space-constrained environments. Its construction typically involves: * **Actuator:** The top button pressed by the user. * **Cover:** Metal plate protecting the internal dome. * **Contact Dome:** A stainless steel or copper alloy disk that provides the "click" feel and completes the circuit. * **Base:** Heat-resistant plastic (LCP or Nylon) suitable for reflow soldering. * **Terminals:** Silver-plated brass for high conductivity and solderability. --- ### 3. Footprint and Dimensions While specific datasheets may vary slightly by manufacturer, the "3A13" series generally follows a compact standard: * **Size:** Approximately 3.0mm x 2.0mm or 3.0mm x 3.0mm (refer to specific CAD drawings). * **Profile:** Ultra-low profile (often < 1.0mm in height), making it ideal for thin devices like smartphones or wearables. --- ### 4. Common Applications Due to its small footprint and tactile feedback, the BS-3A13-R is found in: * **Mobile Devices:** Power or volume buttons in smartphones. * **Wearables:** Smartwatches and fitness trackers. * **Medical Gear:** Portable diagnostic hand-held devices. * **IoT:** Reset buttons for smart home sensors.