5103309-8 is a low-profile through-hole pin header connector designed for board-to-board interconnection applications. This 40-position header features a 0.100 inch (2.54 mm) pitch with dimensions of 2.300 inches (58.42 mm) length and 1.900 inches (48.26 mm) width, providing a compact footprint suitable for manual PCB insertion. The connector utilizes copper alloy contacts plated with 0.000030 inches (0.00076 mm) gold in the mating area and 0.000150 inches (0.00381 mm) tin on solder posts, with entire contacts underplated with 0.000050 inches (0.00127 mm) nickel for enhanced durability and reliability. The housing is constructed from black thermoplastic rated UL 94V-0, ensuring flame resistance and mechanical stability. This connector is ideal for applications requiring reliable signal and power distribution in compact electronic assemblies, including industrial control systems, telecommunications equipment, and data acquisition modules.