The **APTA-213-R** is a specific model of an **SMD (Surface Mount Device) Tactile Switch**, typically manufactured by companies like **ALPS Alpine** or similar precision component vendors. These switches are commonly used in consumer electronics, automotive interfaces, and industrial controls due to their compact footprint and tactile feedback. --- ### 1. Technical Specifications The APTA series is characterized by its miniature size and horizontal/side-actuated orientation. Below are the typical electronic and mechanical specifications: | Feature | Specification | | :--- | :--- | | **Type** | Tactile Switch (Momentary) | | **Mounting Type** | SMD (Surface Mount) | | **Actuation Direction** | Side-Actuated (Right Angle) | | **Operating Force** | Typically 1.6N or 2.5N (Model dependent) | | **Contact Resistance** | Max 100mΩ | | **Insulation Resistance** | Min 100MΩ (at 100V DC) | | **Voltage Rating** | 12V DC | | **Current Rating** | 50mA | | **Operating Life** | 50,000 to 100,000 cycles | --- ### 2. Physical Construction The "parts" or internal components of the APTA-213-R work together to create the "click" feel and electrical connection: 1. **Actuator (Stem):** The plastic part the user presses. In the 213-R, this is usually a side-push button. 2. **Contact Dome:** A snap-action metal disc. When pressed, it collapses to bridge the circuit; when released, it springs back to provide tactile feedback. 3. **Cover:** A metal or plastic shield that protects the internal mechanism and provides structural integrity during soldering. 4. **Terminal Leads:** Silver-plated copper alloy leads designed for SMD soldering onto a PCB. 5. **Base:** A high-temperature thermoplastic (LCP - Liquid Crystal Polymer) capable of withstanding reflow soldering temperatures. --- ### 3. Circuit Diagram The APTA-213-R is a **SPST (Single Pole Single Throw)** normally open switch. ```text (Terminal 1) ----/ ---- (Terminal 2) (Switch) ``` --- ### 4. Common Applications * **Consumer Electronics:** Volume rockers on smartphones, power buttons on tablets. * **Wearables:** Smartwatch side buttons. * **Automotive:** Key fobs, steering wheel controls, and dashboard interfaces. * **Medical:** Handheld diagnostic tools.