1734101-4 is a CHAMP series vertical board-to-board receptacle connector designed for printed circuit board applications. It features 40 positions with a 1.27 mm (0.050 in) centerline pitch and phosphor bronze contacts with gold plating on the mating area. The connector includes boardlock retention, keying post polarization, and a PPA-GF housing material with UL 94V-0 flammability rating. It supports wave solder processes up to 265°C and is compatible with PCB thicknesses ranging from 0.80 mm to 1.60 mm. This RoHS/ELV compliant connector is commonly used in VESA Advanced Feature Connector (VAFC) applications.