The **KMMLS-121-R** is a specific model of a micro-miniature slide switch, commonly used in portable electronics and compact circuit designs. It is part of the KMMLS series, known for its ultra-low profile and surface-mount compatibility. --- ### 1. Technical Specifications Below are the primary electronic and mechanical characteristics of the KMMLS-121-R: | Feature | Specification | | :--- | :--- | | **Switch Function** | SPDT (Single Pole Double Throw) | | **Circuitry** | On-On (Two positions) | | **Current Rating** | 0.3A @ 4V DC | | **Contact Resistance** | 70 mΩ max. | | **Insulation Resistance** | 100 MΩ min. @ 100V DC | | **Dielectric Strength** | 100V AC for 1 minute | | **Operating Life** | 10,000 cycles | | **Operating Force** | 150 ± 100 gf | --- ### 2. Physical & Material Composition The "R" in the part number typically denotes the orientation or specific packaging (often Right-Angle or Tape & Reel). * **Mounting Type:** Surface Mount Technology (SMT). * **Actuator:** Side-actuated (right-angle slider), allowing for edge-of-board placement. * **Terminals:** Silver-plated copper alloy for high conductivity and easy soldering. * **Housing:** High-temperature thermoplastic (LCP - Liquid Crystal Polymer) to withstand reflow soldering temperatures. --- ### 3. Key Applications Due to its miniature footprint (typically around 6.7mm x 2.6mm), this component is found in: 1. **Consumer Electronics:** Power switches for Bluetooth earbuds, digital cameras, and handheld gaming devices. 2. **Medical Devices:** Small diagnostic tools and wearable health monitors. 3. **IoT Modules:** Mode selection (e.g., switching between Wi-Fi and Bluetooth pairing modes). 4. **Prototyping:** Breadboard-friendly logic toggles when used with SMT-to-DIP adapters. --- ### 4. Circuit Diagram Representation In an electronic schematic, the KMMLS-121-R is represented as a three-pin component: ```text [Pin 1] ---- (Output A) | [Slider]--[Pin 2] ---- (Common/Input) | [Pin 3] ---- (Output B) ``` ---