Board-to-board or cable header for industrial signal duty
The 178306-2 is a 12-position, dual-row header from TE's Dynamic D-3100 series, on a 3.81 mm pitch.
Pitch, positions, and plating that define the fit
The 3.81 mm mating pitch and 5.08 mm row spacing set the PCB footprint – each position lands on a 0.150-inch grid, with rows spaced 0.200-inch apart.
The nearest peer in the Dynamic D-3100 family is the 1-1871673-2: a 4-position, 2-row header on a 2.50 mm pitch with tin mating finish. The 178306-2 offers 12 positions at 3.81 mm pitch with gold mating finish – a different circuit count and pitch class for a different board density requirement.