The **KMMLS-33B-R** is a high-performance, ultra-small **Tactile Switch** (Surface Mount Device) commonly used in consumer electronics. It is part of the KMMLS series, known for its side-actuated design and low profile. --- ### ## Technical Specifications Below are the primary electronic and mechanical characteristics of the KMMLS-33B-R: | Feature | Specification | | :--- | :--- | | **Switch Type** | Tactile / Momentary | | **Mounting Type** | Surface Mount (SMD / SMT) | | **Actuator Direction** | Side Actuated (Right Angle) | | **Operating Force** | 160 gf (grams-force) | | **Contact Rating** | 50mA @ 12VDC | | **Dielectric Strength** | 250V AC for 1 minute | | **Operating Life** | 100,000 Cycles | | **Travel (Stroke)** | 0.20 mm | --- ### ### Key Electronic Components & Materials 1. **Contact Dome:** Usually made of stainless steel with silver plating to ensure high conductivity and a crisp "click" feedback. 2. **Terminals:** Brass or copper alloy with silver or gold plating to prevent oxidation and improve solderability. 3. **Base/Housing:** High-temperature thermoplastic (LCP - Liquid Crystal Polymer) designed to withstand lead-free reflow soldering temperatures. 4. **Actuator:** A small plastic plunger that transfers physical pressure to the internal metal dome. --- ### ### Common Applications Due to its side-actuated nature and small footprint, this part is ideal for devices where vertical space is limited: * **Mobile Devices:** Volume rockers or power buttons on smartphones and tablets. * **Wearables:** Smartwatches and fitness trackers. * **Portable Medical:** Handheld diagnostic tools. * **IoT Modules:** Reset buttons on compact circuit boards. --- ### ### Footprint and Soldering The device follows a standard SMT land pattern. To ensure longevity, the following should be considered during assembly: ```c // Typical Reflow Soldering Parameters Preheat_Temp: 150C to 200C Peak_Temp: 260C (Max) Time_at_Peak: 5 to 10 seconds ```