Mezzanine connector for tight board stacks
The 0.80 mm pitch and dual-row center-strip contact arrangement pack a high circuit count into a compact footprint, typical for dense server, switch, or telecom line-card applications where signal density per square mm drives the layout. The plug mates with the matching Free Height receptacle to achieve one of four mated stacking heights — 7 mm, 11 mm, 15 mm, or 19 mm — giving the board designer a single connector family that spans multiple board-spacing requirements without requalifying a new part.
What the 0.80 mm pitch and 140 positions mean for the board layout
The 0.80 mm pitch and 140 positions across two rows suit dense mezzanine layouts.
Stack height options and the single plug
One 2-5177986-6 plug supports four distinct mated stacking heights — 7 mm, 11 mm, 15 mm, and 19 mm — depending on which Free Height receptacle it mates with. That means a single BOM line for the plug across multiple board-stack variants, which simplifies inventory and qualification. The height above board of the plug itself is 6.85 mm, so the 7 mm stack is nearly flush with the plug body; the taller stacks leave an air gap that helps with cross-board airflow in a chassis.