MezzoStak 10106813-071112LF — Hermaphroditic Mezzanine Connector, 70 Positions
The Amphenol FCI 10106813-071112LF is a 70-position member of the MezzoStak series, a hermaphroditic, self-mating mezzanine connector designed for board-to-board stacking. At a 0.020" (0.50mm) pitch across two rows, it packs 70 signal lines into a compact footprint, with a board height of 0.140" (3.55mm) above the PCB. The key differentiator here is the hermaphroditic design — the same connector part goes on both the top and bottom board, which halves the line items on a BOM and eliminates the risk of mismatched mating halves during assembly.
Mated Stack Heights — One Connector, Three Board Spacings
The 10106813-071112LF supports three mated stacking heights: 4mm, 4.5mm, and 5.5mm. This means a single part number covers multiple board-spacing requirements in a product family — the same connector on the top board mates with the same connector on the bottom board, and the stack height is determined by the board thickness and standoff hardware, not by a different connector variant. For a board layout engineer, this simplifies the BOM and reduces qualification testing across height variants.
70 Positions vs. 60 — When the Circuit Count Matters
The 70-position 10106813-071112LF sits at the top of the standard MezzoStak position count range for the 3.55mm height variant. The closest sibling is the 60-position 10106813-061112LF, which shares the same 0.50mm pitch, 3.55mm board height, gold plating, and hermaphroditic mating. There is no 80-position option at this height — the 70-position is the maximum density for the 3.55mm form factor.
Contact Plating — 15µin Gold for Signal-Duty Reliability
For applications requiring frequent reconnection, the gold layer provides consistent contact resistance without the fretting corrosion that tin contacts would show under vibration. The GXT™ option is a harder gold alloy that extends cycle life further, but the standard gold is adequate for most production mezzanine stacks.