5745988-4 is a subminiature D-series right-angle posted receptacle connector manufactured by TE Connectivity (AMP brand) designed for high-density interconnect applications. The connector features 9 contact positions with shell size 1, duplex contact plating (0.000030 inch gold on mating end with tin on termination end and nickel underplate), and is preloaded with size 20 DF posted socket contacts. Key dimensional specifications include a shell length (A) of 1.213 inches (30.81 mm), width (B) of 0.984 inches (24.99 mm), and a mating face depth (D) of 0.235 inches (5.97 mm), with board mounting via 4-40 threaded inserts and boardlocks. This connector is ideal for applications requiring reliable, compact interconnections in industrial equipment, telecommunications, and data processing systems where space constraints and high contact density are critical requirements.