The **WJT-3AA-R** is a specific electronic component, typically categorized as a **Surface Mount (SMT) Tactile Switch**. These components are widely used in consumer electronics for user interface buttons (like power buttons or volume controls) due to their small footprint and reliable "click" feedback. --- ### 1. General Specifications The WJT-3AA-R belongs to a family of micro-switches designed for high-density PCB mounting. | Feature | Description | | :--- | :--- | | **Component Type** | Tactile Switch (Push Button) | | **Mounting Style** | Surface Mount Device (SMD / SMT) | | **Operation Type** | Momentary (Only "ON" when pressed) | | **Actuation Force** | Typically 160gf to 250gf (Gram-force) | | **Contact Arrangement** | SPST (Single Pole Single Throw) | --- ### 2. Key Physical Characteristics The "3AA" in the part number usually refers to the physical dimensions and the height of the plunger (the part you press). * **Compact Size:** Designed for space-constrained boards. * **Terminals:** Usually features "Gull-wing" or "J-lead" terminals for soldering onto the surface of a PCB. * **Tactile Feedback:** Provides a distinct physical "click" sound and feel to confirm the circuit has closed. * **Durability:** Often rated for 100,000 to 500,000 cycles. --- ### 3. Electrical Parameters Typical electrical ratings for this class of switch include: | Parameter | Typical Value | | :--- | :--- | | **Current Rating** | 50mA | | **Voltage Rating** | 12V DC | | **Contact Resistance** | < 100 mΩ | | **Insulation Resistance** | > 100 MΩ (at 100V DC) | | **Dielectric Strength** | 250V AC for 1 minute | --- ### 4. Part Number Breakdown (General Convention) While manufacturers vary slightly, the suffix **"-R"** almost always indicates the packaging method: * **-R:** Stands for **Tape & Reel**. This means the parts are provided on a continuous plastic strip wound onto a reel, specifically designed for automated "Pick and Place" assembly machines. --- ### 5. Common Applications * **Mobile Devices:** Smartphones and tablets (side buttons). * **Wearables:** Smartwatches and fitness trackers. * **Computing:** Mouse buttons or laptop reset switches. * **Industrial:** Interface panels for small handheld controllers. ---