1903404-1 is a 40-position D-shaped receptacle connector kit designed for wire-to-board applications with board mount configuration. It features a 2.54 mm (0.1 in) centerline pitch, dual-row design, and through-hole solder termination to PCB. The connector utilizes phosphor bronze contacts with gold plating on the mating area and nickel underplating, supporting a maximum contact current rating of 1 A. The housing is constructed from polyester with PBT GF cover material, and the primary product color is black. Compatible with 28 AWG (0.08 mm²) discrete wire with insulation diameter up to 1.3 mm, this connector operates within a temperature range of -25°C to 85°C and is suitable for signal circuit applications in various electronic assemblies.