5176139-3 is a Standard Edge II card edge connector designed for high-density PCB interconnection applications. It features a special 18/31 dual combination connector type with 52 dual positions and a 2.54 mm (0.100 inch) centerline spacing, utilizing solder post termination for vertical PCB mounting with integrated mounting ears. The connector incorporates gold-plated phosphor bronze contacts (30 µm gold mating area plating with nickel underplating and tin termination area plating) housed in a black, glass-filled polyester body rated UL 94V-0, with PCB retention features at positions 5, 6, 31, 32, 41, 42, 93, and 94. This RoHS and ELV compliant connector is wave solder capable to 240°C, 260°C, and 265°C, making it suitable for industrial control systems, telecommunications equipment, and data processing applications requiring reliable edge card connections.