The FSMIJ65AB04 is an illuminated tactile switch from TE Connectivity's ALCOSWITCH series, featuring a low-intensity blue LED indicator integrated into a 6x6 mm through-hole mounted switch body. This switch is rated for 200,000 electrical cycles at 520 grams-force actuation and provides tactile and audible feedback with a contact rating of 50 mA at 12 VDC. The switch utilizes stainless steel silver-plated contacts, high-temperature thermoplastic actuator and case (UL94-VO rated), and brass silver-plated terminals, ensuring durability and reliability. The integrated LED design saves board space while offering design flexibility, and the switch is compatible with reflow and wave solder assembly processes. Applications include industrial equipment, building automation, HVAC systems, instrumentation, communication equipment, and control systems where illuminated pushbutton interfaces are required.