The **MA11TAD-R** is a specific electronic component typically identified as a **tactile switch** (or tact switch). These components are momentary push-button switches commonly used in low-voltage interface circuits to provide user feedback. ### 1. General Specifications While specifications can vary slightly by manufacturer (often associated with brands like Huai Yang or similar generic electronic part suppliers), the "MA" series generally follows these parameters: | Parameter | Typical Value | | :--- | :--- | | **Switch Type** | Tactile (Momentary) | | **Circuit** | SPST (Single Pole Single Throw) | | **Mounting Type** | Surface Mount (SMD) / Gull-wing | | **Operating Force** | 160gf to 250gf (Commonly 160gf) | | **Contact Rating** | 50mA @ 12V DC | | **Travel** | 0.25mm ± 0.1mm | --- ### 2. Part Number Breakdown The suffixing in these parts usually indicates physical dimensions and packaging: * **MA**: Series identifier for the micro-tactile switch line. * **11**: Often refers to the physical size of the switch base (e.g., 3x3mm or 4x4mm class). * **TAD**: Refers to the actuator height and the specific terminal shape (T-type or Gull-wing for SMD). * **R**: Generally stands for **Tape & Reel** packaging, indicating it is intended for automated SMT (Surface Mount Technology) assembly lines. --- ### 3. Key Electronic Characteristics The MA11TAD-R is designed for signal-level switching rather than power switching. * **Contact Resistance:** Usually < 100mΩ. Over time and use, this resistance may increase due to oxidation or wear. * **Insulation Resistance:** > 100MΩ at 100V DC. * **Dielectric Strength:** Capable of withstanding 250V AC for 1 minute. * **Bounce Time:** Typically less than 10ms. In digital circuits (like Arduino or Microcontrollers), software debouncing is required to prevent multiple trigger events from a single press. --- ### 4. Common Applications These parts are found in compact consumer electronics where space is at a premium: 1. **Wearables:** Smartwatches and fitness trackers. 2. **Portable Electronics:** Digital cameras, MP3 players, and handheld GPS. 3. **Peripheral Devices:** Computer mice, reset buttons on routers, and side buttons on mobile phones. --- ### 5. Footprint Diagram (Generic SMD Tact) ```text [ Actuator ] |-----------| | (Top) | ---| |--- (Pin 1) (Pin 2) ---| |--- |___________| ``` *Note: Even though tactile switches often have 4 pins, they are usually internally connected in pairs. Pins 1 and 2 are usually one side of the switch, while 3 and 4 are the other.*