Board-to-Board Connector Guide: Pitch, Stack Height and How to Choose
Time:2026-11-09
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A board-to-board connector does one job: stack two PCBs at a precise height and carry signals between them. Get it right and the whole product is smaller and easier to assemble; get the stack height wrong by half a millimetre and the enclosure won’t close. It’s a part where the number that matters most isn’t on the datasheet’s first line.
Pitch decides how much you can carry
Fine-pitch connectors — 0.5 mm and 0.8 mm — pack the most signals into the least board edge, which is why they dominate phones, wearables and camera modules. Coarser pitches (1.27 mm, 2.54 mm) trade density for robustness and easier handling, and they show up in industrial and test equipment where a connector gets unplugged by hand.
Stack height: the dimension nobody can fudge
Stack height is the finished gap between the two boards. It’s set by the connector’s mated height, and it’s non-negotiable — your enclosure and any standoffs are designed around it. Specify it first, then pick the pitch and pin count to fit within that envelope. We stock board-to-board connectors from H4.5 mm to H5.0 mm stack heights in fine pitch.
Mezzanine vs stacking: know the geometry
A mezzanine connector joins two parallel boards face-to-face. A stacking or board-edge setup can also join them at a right angle. Confirm which geometry your mechanical design actually shows before ordering — the pin counts can look identical on paper.
Board-to-board connectors are also where customisation pays off fastest: a standard part can leave an awkward gap, while a factory-tuned stack height makes the enclosure flush. We manufacture B2B connectors in our Shenzhen plant and adjust stack height, pin count and plating to your drawing — which a catalogue part can’t do for you.
Frequently Asked Questions
What is stack height?
The finished gap between two stacked PCBs, set by the mated height of the connector. It must match your enclosure and standoffs exactly.
What is a mezzanine connector?
A connector that joins two parallel boards face-to-face, as opposed to a right-angle board-edge connection.
What pitches do you offer?
Fine-pitch 0.5 mm and 0.8 mm, plus coarser pitches for industrial applications, with stack heights from H4.5 mm to H5.0 mm.
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