1-644487-0 is an MTA-100 shrouded header designed for wire-to-board and board-to-board interconnection applications. It features straight posts with 0.025 inch (0.64 mm) square cross-section and retention pegs for secure mating with compatible housings. The header is constructed with duplex-plated gold on the mating end of posts and tin on the solder tail, ensuring reliable electrical contact and corrosion resistance. The post spacing is 0.100 inch (2.54 mm) typical, and the overall length is calculated by multiplying 0.100 inches by the number of posts. This connector is RoHS compliant (lead-free) and suitable for applications requiring robust, polarized interconnections in printed circuit board assemblies, particularly in industrial and telecommunications equipment where reliable mating and retention are essential.