The 77311-111-36LF: The 0.100" (2.54mm) insulation height means the header sits low on the board — useful when the mating receptacle has a low-profile backshell or when the board-to-board stack height is tight. The mating receptacle provides the polarization and keying, so the header itself has no shroud to prevent mis-mating. In a production harness, the mating half should be keyed or color-coded to avoid a 180° reversal.
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