The 643426-1 is a 9-circuit vertical socket header from the Universal MATE-N-LOK connector series, designed for wire-to-board applications. It features a polarized design to prevent mismating and has a standard tail configuration for mounting onto PC boards. The housing is made from a UL94V-0 rated material, and the sockets feature a pre-tin finish. This header is built on a .250 inch (6.35 mm) centerline spacing and is rated for 600V AC/DC. These connectors are designed for applications where reliability is crucial, with features like positive locking housings and fully enclosed contacts.