The 178327-3 is a 16-position, 2-row vertical header from TE's Dynamic D-3100 series, on a 0.150" (3.81 mm) pitch. It is a board-to-board or cable interconnect with full 4-wall shrouding to protect the rectangular tab contacts during handling and mating.
Mounting and board-lock detail
The row spacing is 0.200" (5.08 mm), which gives room for trace routing between rows on a standard 2-layer board. The insulation height of 0.850" (21.59 mm) means the header sits tall above the board — check your enclosure clearance before layout.