The **216TDK-R** is a specific electronic component typically identified as a **tactile switch** (or tact switch) manufactured by companies like **CIT Relay & Switch**. These components are fundamental in human-machine interfaces, providing tactile feedback (a "click" feel) when pressed. --- ## 1. Technical Specifications The following table outlines the typical electrical and mechanical characteristics of the 216TDK-R series: | Feature | Specification | | :--- | :--- | | **Contact Arrangement** | SPST (Single Pole Single Throw) | | **Contact Type** | Normally Open (NO) | | **Switching Voltage** | 12VDC - 24VDC (Typical) | | **Switching Current** | 50mA | | **Actuation Force** | 160gf (Grams-force) | | **Termination Style** | Gullwing (Surface Mount - SMT) | | **Travel** | 0.25mm ± 0.1mm | --- ## 2. Key Physical Characteristics The "216" and suffix "R" in the part number often refer to specific dimensions and packaging: * **Compact Footprint:** These switches are designed for high-density PCB layouts. * **Stem Height:** The physical height of the actuator (the part you press) is specific to this model to fit through device enclosures. * **Tape and Reel (R):** The "R" usually denotes that the parts are supplied on a reel for automated SMT (Surface Mount Technology) assembly lines. * **Ground Pin:** Many versions include a grounding pin to protect against Electrostatic Discharge (ESD). --- ## 3. Materials and Construction The internal anatomy of the 216TDK-R is designed for longevity and reliability: 1. **Actuator:** Usually made of high-temperature thermoplastic (LCP or Nylon). 2. **Cover:** Stainless steel or nickel-plated steel for structural integrity. 3. **Contact Dome:** Stainless steel with silver plating to ensure a crisp "snap" and low contact resistance. 4. **Base:** Heat-resistant resin to withstand reflow soldering temperatures. --- ## 4. Typical Applications Because of its small size and reliable tactile response, this part is found in: * **Consumer Electronics:** Remote controls, digital cameras, and handheld gaming devices. * **Telecommunications:** Mobile phones and wireless headsets. * **Medical Devices:** Portable diagnostic equipment and monitoring tools. * **Instrumentation:** Buttons on oscilloscopes or multimeters. ---