The **WPT-2B2-R** is a specific electronic component typically identified as a **Water Proof Tactile Switch** (Tact Switch) produced by manufacturers like **Wintek** or similar component vendors. It is designed for PCB mounting where moisture protection and a small footprint are required. --- ### 1. Key Technical Specifications The following table outlines the typical electrical and physical parameters for the WPT-2B2-R series: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile (Momentary) | | **Mounting Type** | Through-Hole (THT) or SMD (depends on sub-variant) | | **Contact Rating** | 50mA @ 12V DC | | **Insulation Resistance** | 100MΩ Min at 100V DC | | **Dielectric Strength** | 250V AC for 1 minute | | **Operating Force** | 160gf to 250gf (Standard: ~160gf) | | **Travel** | 0.25mm ± 0.1mm | | **Operating Life** | 100,000 cycles minimum | | **Ingress Protection** | IP67 (Dust-tight and Water-resistant) | --- ### 2. Internal Components and Construction The "electronic parts" of this switch consist of several micro-components working in unison: 1. **Actuator (Stem):** The part the user presses. In the "R" variant, this is often a rubberized or silicone-sealed plunger to prevent water ingress. 2. **Contact Dome (Snap Plate):** A precision-engineered metal alloy disk. When pressed, it collapses to complete the circuit and provides the "click" tactile feedback. 3. **Base (Housing):** Usually made of high-temperature resistant thermoplastic (LCP or PBT) to withstand soldering heat. 4. **Terminals:** Silver-plated or Gold-plated brass pins that provide the electrical connection to the PCB. 5. **Sealing Membrane:** A thin silicone or rubber film that sits between the actuator and the dome to ensure the IP67 rating. --- ### 3. Circuit Diagram Most WPT-2B2-R switches are **SPST-NO** (Single Pole Single Throw, Normally Open). ```text [ Terminal 1 ] ----\ ---- [ Terminal 2 ] \ (Switch) / [ Terminal 3 ] ----/ ---- [ Terminal 4 ] ``` *Note: Terminals 1 & 2 are usually internally connected, as are 3 & 4.* --- ### 4. Common Applications Due to its waterproof nature and compact size, the WPT-2B2-R is commonly found in: * **Wearable Electronics:** Smartwatches and fitness trackers. * **Outdoor Equipment:** Handheld GPS units and portable radios. * **Medical Devices:** Equipment that requires frequent sanitization/wiping. * **Automotive:** Dash buttons or key fobs.