The **RTS-33B-R** is a high-performance, ultra-compact **Tactile Switch** (tact switch) manufactured by **C&K Components** (now part of Littelfuse). These switches are commonly used in portable electronics, wearable technology, and medical devices due to their small footprint and reliable feedback. --- ### 1. Technical Specifications The table below highlights the primary electronic and mechanical characteristics of the RTS-33B-R: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile (Momentary) | | **Mounting Type** | Surface Mount (SMT) | | **Actuation Force** | 1.6 N (160 grams-force) | | **Operating Life** | 100,000 cycles | | **Voltage Rating** | 12 VDC | | **Current Rating** | 50 mA | | **Contact Material** | Silver Plating | | **Dimensions** | 3.0 x 3.0 x 0.6 mm (Ultra-low profile) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Key Electronic Components & Design The RTS-33B-R consists of several critical internal layers that define its electronic behavior: * **Stainless Steel Dome:** The "heart" of the switch. It acts as both the spring mechanism and the bridge that completes the electrical circuit when pressed. * **Terminals (Contacts):** These are the electrical leads soldered to the PCB. The silver plating ensures low contact resistance and high conductivity. * **Base (Housing):** Typically made of high-temperature thermoplastic (LCP - Liquid Crystal Polymer) to withstand the heat of reflow soldering. * **Sealing:** The "R" in the series often denotes a specific level of sealing or tape-and-reel packaging, providing protection against dust and moisture during the assembly process. --- ### 3. Application Use Cases Because of its extremely small height (0.6mm), the RTS-33B-R is found in devices where space is at a premium: 1. **Wearables:** Smartwatches and fitness trackers. 2. **Mobile Devices:** Volume or power buttons on smartphones and tablets. 3. **Medical:** Portable diagnostic equipment and hearing aids. 4. **Consumer Electronics:** Remote controls and Bluetooth headsets. --- ### 4. Circuit Representation The switch is a **Single Pole Single Throw (SPST)**, Normally Open (NO) component. Below is a representation of its simple circuit behavior: ```c // Logical Representation [Terminal A] ----/ ---- [Terminal B] (Open by default; Closed when actuated) ```