The **WJT-2DB-R** is a specific model of an **SMD (Surface Mount Device) Tactile Switch**. These components are fundamental in electronics for providing user input through a physical "click" mechanism. --- ### 1. General Specifications Based on the standard nomenclature for the WJT series, here are the typical technical characteristics: | Property | Description | | :--- | :--- | | **Component Type** | Tactile Push Button Switch | | **Mounting Type** | Surface Mount (SMD / SMT) | | **Circuitry** | SPST (Single Pole Single Throw) | | **Operation Type** | Momentary (Normally Open) | | **Actuation Direction** | Vertical (Top Actuated) | --- ### 2. Electrical Characteristics These parts are designed for low-power signal switching rather than high-current power management. * **Contact Rating:** Typically 50mA @ 12V DC. * **Contact Resistance:** $\leq$ 100m$\Omega$ (Initial). * **Insulation Resistance:** $\geq$ 100M$\Omega$ at 100V DC. * **Dielectric Strength:** 250V AC for 1 minute. * **Bounce Time:** Usually < 5ms or 10ms. --- ### 3. Mechanical Features The suffix codes in "WJT-2DB-R" often refer to specific physical dimensions and packaging: * **Operating Force:** Generally ranges from **160gf to 260gf** (Grams-force). This determines how "stiff" the button feels. * **Travel Distance:** Usually between **0.20mm and 0.35mm**. * **Life Expectancy:** Typically rated for **50,000 to 100,000 cycles**. * **Packaging (-R):** The "R" usually indicates **Tape and Reel** packaging, suitable for automated Pick-and-Place assembly lines. --- ### 4. Typical Applications Because of its small footprint and SMD nature, the WJT-2DB-R is commonly found in: 1. **Consumer Electronics:** Remote controls, calculators, and handheld gadgets. 2. **Wearables:** Smartwatches and fitness trackers (due to compact size). 3. **Industrial:** Control panels and reset buttons on PCBs. 4. **PC Peripherals:** Mouse buttons or keyboard function keys. --- ### 5. Footprint Diagram (Example) While you should always consult the specific manufacturer's datasheet (e.g., from brands like *Winnerele* or *Kingten*), the footprint usually follows a standard 4-pin or 2-pin layout: ```text [ PCB PAD ] (1)---[ ]---(2) [SW] (3)---[ ]---(4) ``` *Pins 1 & 2 are usually internally connected, as are 3 & 4. Pressing the switch bridges the gap between the 1-2 pair and the 3-4 pair.*