2-644489-3 is an MTA-100 series PCB header designed for wire-to-board interconnect applications. This header features 0.100 inch (2.54 mm) centerline spacing with 0.025 inch (0.64 mm) square posts in a right-angle configuration. The header includes polarized retention pegs for secure board mounting and is designed to mate with MTA-100 and CST-100 II connectors. It is commonly used in printed circuit board applications requiring reliable wire-to-board connections in consumer electronics, industrial controls, and appliance applications.