RKA2SGK055SMTRLFS is a microminiature SMT top-actuated tactile switch designed for compact, high-density PCB applications. This switch features a 250 gf operating force with a rated life of 200,000 cycles, momentary action contact arrangement (SPST N.O.), and a compact footprint of 4.5 × 4.5 × 0.55 mm. Electrical specifications include a maximum voltage rating of DC 15 V, maximum current of 20 mA, contact resistance of 500 mO maximum, and insulation resistance of 50 MO minimum, with a bounce time of =10 ms and dielectric strength of 250 VA C. The switch operates reliably over a temperature range of -40°C to 85°C and features SMT gullwing termination with lead-free compatibility. It is ideal for applications requiring high component density in limited PCB space, such as automotive key fobs, navigation systems, and health & medical devices.