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Board to Board Connector
Industrial, IT Datacom
A board-to-board link only earns its place when it solves a spacing problem you actually have. At 0.8mm pitch with a 14.5mm stack height, this vertical surface-mount plug is made for the gap a low-profile joiner cannot reach, yet still needs a dense, fine-pitch interconnect. CONSHARE produces it in three pin builds from one tooling family, so your mating receptacle stays identical as a product scales from 40 to 80 contacts.
Most fine-pitch board-to-board parts sit close, around 4 to 6mm, because that is where most stacks live. This one is deliberately taller, and that height is the feature, not a side effect.
When the lower circuit carries tall components, a shield can, or a heatsink, a shallow connector forces you into costly board re-layouts or thinned-down parts. A 14.5mm bridge clears those parts and gives service clearance, so the inner board can use standard-height components instead of custom low-profile ones.
At 0.8mm pitch you keep a compact footprint while still carrying 40, 50, or 80 contacts in a two-row layout. That density is what lets a single plug replace several larger-pitch connectors and free board area for routing.
All three share the same outline and receptacle, so choosing comes down to how many signals you need to move.
Part number | Pin layout | Contact finish | Typical use |
|---|---|---|---|
AA2M040S1145R | 2 × 20 (40) | 1µ" gold on mating face, matte tin tail | Compact control and sensor links |
AA2M050S1145R | 2 × 25 (50) | 1µ" gold on mating face, matte tin tail | Display and camera module bridges |
AA2M080S1145R | 2 × 40 (80) | Gold flash on mating face, matte tin tail | Baseboard to high-density daughtercard |
If your pin count is set, the choice is made for you. If you are still deciding, start from the 40-contact build and move up only when routing or future features demand it, since the receptacle does not change between them.
Spec sheets list values; what matters is what they let you do.
Each contact carries 0.5A at 50V AC/DC, enough to feed signal lines and a share of light power without splitting the link into separate power connectors. For designs that draw more, run a few extra pins in parallel rather than overloading one.
Contact resistance stays at or below 80mΩ and insulation resistance holds at 500MΩ minimum, with a 200V AC dielectric withstand. Together they mean low and predictable loss across the mating interface and a comfortable safety margin over the working voltage.
The mating surface is gold finished while the solder tails are matte tin over a nickel underplate. Gold keeps the contact interface low-resistance and corrosion stable through repeated mating cycles; tin gives you a solderable, pick-and-place-friendly tail at a sensible cost. The split finish is the reason this part performs like a premium link without the premium price of full gold through-hole.
Real layouts show where the 14.5mm height pays off:
Stacked RF and shielded modules where the inner board holds a can or filter that a short connector would hit.
Handheld display assemblies bridging a mainboard to an LCD or touch module with component clearance behind the screen.
Industrial sensor stacks that need service gap and vibration tolerance between a sensing board and the controller.
Communications baseboards linking a processor card to a high-pin daughtercard without re-spacing the whole chassis.
The vertical SMT form also places the solder joints on the board surface, so reflow and automated optical inspection run the same way as the rest of your SMT line.
Housings use a black LCP rated UL94V-0, stable through reflow and low in moisture pickup, which protects both dimensional accuracy and long-term insulation. Contacts are copper alloy for spring reliability, and each production lot is checked for plating thickness, contact resistance, and solderability rather than only at final audit.
Common pin and finish combinations are held in rotating stock. Builds that need a different gold thickness or stack height run on the same line and tooling, so a non-stock order typically leaves the floor in three to four weeks instead of the eight to twelve weeks a fully bespoke part would cost you.
Within the same family you can specify gold flash up to 30µ" on the contact, stack heights of 4.5, 9.5, or 14.5mm, and pin counts from 2 × 5 up to 2 × 70. Tape-and-reel packing is standard for pick-and-place, and custom reel or humidity-barrier options are available on request.
Being straight about fit saves a return. Skip this part if:
Your board gap is under about 5mm, where a shorter stack height gives better rigidity and lower profile.
You need more than 0.5A per pin on a sustained basis; add dedicated power contacts instead.
Assembly is manual through-hole; this is a surface-mount part built for reflow.
The mating side must tilt or float; a vertical fixed plug assumes the two boards stay parallel.
If any of those describe your design, tell CONSHARE the gap, current, and assembly method and we will point to the right member of the family.
No. The receptacle is sized to the contact count, so a 40, 50, and 80-contact plug each need their matching receptacle. Plan the receptacle from your highest planned build.
Yes. The LCP housing and tin-tailed contacts are rated for normal lead-free reflow; follow the peak temperature and time listed in the process guideline.
Yes, all three builds ship in tape and reel as standard.
Both can, within the family ranges above, usually without new tooling.
The housing and plating combinations are selected for standard restricted-substance compliance; confirm the exact declaration for your destination market with our team.
