The **SWT8-R1STR** is a specific model of an **SMD (Surface Mount Device) Tactile Switch**. These components are widely used in consumer electronics, industrial controls, and medical devices to provide a physical interface for user input. --- ## 1. Technical Specifications The following table summarizes the key electrical and physical characteristics typical for this series: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile (Momentary) | | **Mounting Type** | Surface Mount (SMT/SMD) | | **Actuator Type** | Standard Round / Flush | | **Operating Force** | 160gf to 250gf (Commonly 160gf) | | **Contact Rating** | 50mA @ 12V DC | | **Contact Resistance** | 100 mΩ Max | | **Insulation Resistance** | 100 MΩ Min @ 100V DC | | **Travel** | 0.25mm ± 0.1mm | | **Operating Life** | 50,000 to 100,000 cycles | --- ## 2. Pin Configuration and Circuitry The SWT8 series typically utilizes a standard SPST (Single Pole Single Throw) "Normally Open" configuration. ### Schematic Representation ```text (Pin 1) ----/ ---- (Pin 2) Switch (Pin 3) ---------- (Pin 4) Note: Pins 1 & 3 are often internally connected, as are Pins 2 & 4. ``` --- ## 3. Key Features * **Tactile Feedback:** Provides a distinct "click" feel to the user, confirming the button has been successfully pressed. * **Tape and Reel Packaging:** The "TR" in the part number indicates it is supplied on a Tape and Reel, making it compatible with high-speed automated pick-and-place assembly machines. * **Low Profile:** Designed for compact PCB layouts where vertical space is limited. * **High Reliability:** The sealed or semi-sealed nature of these switches protects the contacts from minor dust and environmental debris. --- ## 4. Typical Applications 1. **Consumer Electronics:** Power buttons on cameras, volume keys on portable players. 2. **Computing:** Reset buttons on motherboards or peripheral input devices. 3. **Industrial:** Interface panels for PLC (Programmable Logic Controllers). 4. **Automotive:** Dashboard controls and keyless entry fobs.