Pitch and Pin Count Drive the Footprint
The 3-534206-2: At 64 positions on a 0.100" pitch, this header occupies about 3.2 inches of board edge per row — a dense signal interconnect for parallel data buses or multi-wire harnesses. The dual-row layout keeps the board real estate smaller than stacking two single-row headers.
All 64 positions are loaded, so no blank spots to work around in the layout.
