The **KSS321GLFS** is a specific model of a sub-miniature, side-actuated tactile switch manufactured by **C&K Components** (now part of Littelfuse). It is widely used in consumer electronics, automotive interiors, and industrial controls due to its compact size and high reliability. --- ### 1. Key Technical Specifications The electrical and mechanical characteristics are critical for integrating this part into a PCB design. | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile Switch (Momentary) | | **Orientation** | Side Actuated (Right Angle) | | **Contact Rating** | 1 VA max / 32 VDC max | | **Contact Resistance** | < 100 mΩ | | **Operating Force** | 1.6 N (approx. 160 grams) | | **Life Cycles** | 100,000 operations | | **Mounting Type** | Surface Mount (SMT) / Gullwing | | **Terminal Material** | Silver Plated (LFS = Lead-Free Silver) | --- ### 2. Physical Design & Dimensions The "KSS" series is known for its "low profile" side-actuation. * **Actuator Height:** The KSS321 is designed to be pressed from the side, making it ideal for buttons on the edges of devices (like volume rockers or power buttons). * **Sealing:** It features a **G** design (as indicated by the 'G' in the part number), which typically refers to a design that provides a level of protection against dust and environmental factors. * **Footprint:** It uses a "Gullwing" lead configuration for SMT soldering, ensuring strong mechanical stability during the pressing action. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **KSS** | Series Name (Sub-miniature side-actuated) | | **3** | Height/Design variant | | **2** | Operating Force (2 = 1.6 Newton) | | **1** | Contact Material (1 = Silver) | | **G** | Gullwing SMT Terminals | | **LFS** | Lead-Free, Silver Plated (RoHS compliant) | --- ### 4. Applications Because of its small footprint and side-entry actuation, you will commonly find the KSS321GLFS in: * **Mobile Devices:** Power or volume buttons on smartphones. * **Automotive:** Key fobs, steering wheel controls, or dashboard interfaces. * **Medical:** Portable diagnostic equipment. * **Wearables:** Smartwatches and fitness trackers. ---