643426-3 is a 9-circuit matrix-style PC board socket header designed for 5.0 mm Power Key Connectors (5.0 PKC) wire-to-board applications. This connector features a duplex finish with pre-tin plating on the solder tail end and gold plating in the mating area, ensuring reliable electrical contact and corrosion resistance. The socket header has an A dimension of 0.800 inches (20.32 mm) and is compatible with standard tail configurations for 0.062 inch (1.57 mm) thick PC boards. The connector is UL94V-0 flammability rated and recognized under Underwriters Laboratories Component Program (File No. E28476) and Canadian Standards Association (File No. LR7189). This product is ideal for power circuit applications in home appliances, particularly gas appliances, where robust connections and compact design with 19.4 mm mated height are required.