5177984-1 is a fine pitch SMT stacking plug connector designed for parallel board-to-board applications. This 40-position connector features a 0.8mm pitch and 8µ" gold plating on contacts, with dimensions of A: 15.20mm, B: 21.80mm, and C: 20.20mm. It operates over a temperature range of -40°C to +85°C (including terminal temperature rise) and is rated for 500 VAC dielectric withstanding voltage for 1 minute. The connector supports various stacking heights when paired with compatible receptacles, making it suitable for compact electronic assemblies requiring reliable board-to-board interconnections.