The **KMMLS-332-R** is a specific electronic component, typically categorized as a **Surface Mount (SMT) Low Profile Tactile Switch**. These components are widely used in consumer electronics for user interface buttons (like power or reset buttons) due to their small footprint and tactile feedback. --- ### 1. Technical Specifications Below are the typical electrical and mechanical specifications for this class of component: | Feature | Specification (Typical) | | :--- | :--- | | **Type** | Tactile Switch (Momentary) | | **Mounting Type** | Surface Mount (SMT/SMD) | | **Circuit** | SPST - NO (Single Pole Single Throw - Normally Open) | | **Actuation Force** | 160gf to 250gf (Common range) | | **Voltage Rating** | 12V DC | | **Current Rating** | 50mA | | **Dimensions** | Approx. 3.0mm x 2.0mm to 3.5mm x 3.0mm | | **Orientation** | Side Actuated / Right Angle | --- ### 2. Key Internal Components The KMMLS-332-R consists of several precision-engineered parts that work together to provide an electrical connection: 1. **Contact Dome (Stainless Steel):** This is the "heart" of the switch. When pressed, it collapses to complete the circuit and provides the "click" sound and feel. 2. **Actuator (Stem):** The physical button part that the user pushes. In this model, it is often a low-profile plastic piece. 3. **Base (Housing):** Made of High-Temperature Thermoplastic (LCP or Nylon) to withstand the heat of reflow soldering. 4. **Terminals:** Copper alloy plated with Silver or Gold to ensure high conductivity and prevent oxidation. 5. **Cover:** A metal shield that holds the components together and provides structural integrity when soldered to the PCB. --- ### 3. Application Use Cases Because of its small size and "Right Angle" (R suffix) orientation, it is commonly found in: * **Mobile Devices:** Side buttons for volume or power. * **Wearables:** Smartwatches and fitness trackers. * **Medical Devices:** Compact handheld diagnostic tools. * **IoT Hardware:** Reset or pairing buttons on small PCB boards. --- ### 4. Typical Footprint (Conceptual) ```c // Example Pad Layout for SMD Tactile Switch [Pad 1] ----- [Actuator] ----- [Pad 2] | | [GND/Body] [Signal Out] ```