5747839-4 is a right-angle posted subminiature D receptacle connector manufactured by TE Connectivity (AMP brand) designed for PCB board mounting applications. This connector features 37 contact positions with shell size 4, duplex-plated socket contacts (size 20 DF posted type), and is configured with threaded inserts for boardlock mounting. The connector has dimensions of 2.729 inches (69.32 mm) length by 2.500 inches (63.50 mm) width, with a contact finish plating code A (.000030 inches gold on mating end, tin on termination end, with nickel underplate). It is preloaded with posted socket contacts and is RoHS compliant. This connector is commonly used in high-density applications requiring reliable right-angle board mounting with secure mechanical retention through boardlock hardware.