The **ALPT-143-R** is a specific electronic component primarily categorized as a **Surface Mount (SMT) Low Profile Tactile Switch**. These switches are designed for user interface applications where space is limited and a physical "click" feedback is required. --- ## Technical Specifications The following table summarizes the key electrical and mechanical characteristics typical for the ALPT series: | Property | Specification | | :--- | :--- | | **Switch Type** | Tactile (Momentary) | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Actuation Direction** | Vertical (Top Actuated) | | **Dimensions** | Approx. 3.9mm x 2.7mm | | **Contact Rating** | 50mA, 12V DC | | **Operating Force** | 1.6N (approx. 160gf) | | **Operating Life** | 100,000 to 500,000 cycles | | **Travel distance** | 0.12mm - 0.25mm | --- ## Key Features 1. **Low Profile Design:** The "ALPT" series is known for its extremely thin height (often around 0.8mm to 1.4mm), making it ideal for slim handheld devices. 2. **Tactile Feedback:** Despite its small size, it provides a crisp, audible, and physical click to notify the user that the connection has been made. 3. **Reflow Solderable:** Designed to withstand high temperatures during the SMT reflow soldering process. 4. **IP Rating (Optional):** Many variants in this series are designed with dust resistance to ensure longevity in mobile environments. --- ## Internal Circuit Diagram The internal structure is a simple "Normally Open" (SPST-NO) configuration. When the actuator is pressed, the metal dome collapses to bridge the contacts. ```text Terminals 1 & 2 (Input) | / (Dome Switch) | Terminals 3 & 4 (Output) ``` --- ## Common Applications * **Mobile Devices:** Power buttons or volume rockers on smartphones. * **Wearables:** Smartwatches and fitness trackers. * **Medical Equipment:** Portable diagnostic tools. * **Consumer Electronics:** Remote controls and Bluetooth headsets.