5-104078-2 is a double row vertical board mount receptacle from the AMPMODU System 50 interconnection system, designed for board-to-board applications. This 40-position connector features a 0.050 x 0.100 inch (1.27 x 2.54 mm) centerline spacing with a post length of 0.100 inch (2.54 mm) and dimension A of 1.044 inch (26.52 mm). The housing is constructed from glass-filled thermoplastic with a black finish and UL 94V-0 flammability rating. Contacts are made of copper alloy with duplex plating featuring 0.000030 inch (0.00076 mm) gold in the mating area, 0.000150 inch (0.00381 mm) tin on solder posts, and 0.000050 inch (0.00127 mm) nickel underplating. This RoHS compliant connector is suitable for through-hole mounting applications requiring reliable board-to-board connections.