The **MA74FBG-R** is a specific electronic component, typically identified as a **tactile switch** (tact switch) manufactured by companies like **CIT Relay & Switch**. It is designed for low-power, momentary signal switching in consumer electronics and industrial control panels. --- ### Technical Specifications The following table highlights the core electrical and mechanical characteristics of this component: | Feature | Specification | | :--- | :--- | | **Switch Type** | Momentary Tactile Switch | | **Mounting Type** | Surface Mount (SMT/SMD) | | **Actuator Height** | 0.45mm to 0.50mm (Low Profile) | | **Operating Force** | 160gf to 240gf (standard range) | | **Contact Rating** | 50mA @ 12VDC | | **Contact Resistance** | < 100mΩ | | **Operating Life** | 100,000 to 500,000 cycles | | **Packaging** | Tape & Reel (indicated by the "-R" suffix) | --- ### Part Number Breakdown Understanding the nomenclature helps in identifying the physical configuration: 1. **MA74**: The series designation, representing a sub-miniature tactile switch series. 2. **FBG**: * **F**: Often denotes the force rating (e.g., 160gf). * **B**: Refers to the actuator style or height. * **G**: Represents the contact material (typically Gold plating for better conductivity and oxidation resistance). 3. **-R**: Indicates the packaging method, specifically **Tape & Reel**, which is essential for automated pick-and-place assembly lines. --- ### Key Applications Due to its small footprint and surface-mount design, the MA74FBG-R is commonly found in: * **Mobile Devices:** Power or volume buttons in smartphones and tablets. * **Wearables:** Smartwatches and fitness trackers where space is limited. * **Portable Medical Gear:** Handheld diagnostic tools. * **Automotive:** Interior control buttons (infotainment, overhead lights). --- ### Design Considerations When integrating this part into a PCB layout, consider the following: * **Reflow Soldering:** As an SMT component, it must be rated for lead-free reflow soldering temperatures (typically up to 260°C). * **Debouncing:** Like all mechanical switches, it requires hardware or software debouncing to prevent "ghost" presses caused by mechanical contact bounce. * **Force Feedback:** The "tactile" nature provides a physical "click" sensation, which is critical for user interface (UI) feedback.