Define the connection architecture
Identify whether the product needs wire-to-board, board-to-board, card-edge or an external cable interface. Headers, receptacles, terminal blocks and FFC/FPC connectors solve different connection problems. Select the complete mating system rather than only the board-mounted part.
For stacked or right-angle boards, define relative position, orientation, separation and available assembly motion. Board stacking is a mechanical arrangement, not a multilayer PCB stackup. Include support, enclosure clearance and service access in the interface drawing.
Check electrical and environmental requirements
Use the exact connector specification for contact ratings, voltage, signal behavior, mating durability and environment. Current capability depends on the actual conditions and configuration; a headline rating does not necessarily apply to every simultaneously loaded contact.
Record pin mapping, polarity and keying. For high-speed or RF signals, consider the connector and its PCB launch as part of the channel. For power, review contact resistance, board current paths and temperature alongside the mechanical retention.
Choose the termination and assembly method
Soldered SMT, through-hole and press-fit board terminations require different footprints and acceptance checks. Wire interfaces may use crimp, insulation displacement or direct soldering. Specify the contact, wire, tooling and preparation requirements for the selected system.
Other interconnect methods, such as wire bonding, conductive adhesive or solder-ball attachment, are specialized assembly processes rather than interchangeable connector substitutes. Qualify the chosen process for its function. Solder joints or fine contacts should not be the sole unintended support for cable or enclosure loads.
Verify fit and the released package
Check the supplier drawing against pads, holes, mounting features, board thickness and the mating envelope. Review tolerances across both boards or the cable assembly. A library model that looks correct in 3D can still have a wrong pin map or hole definition.
Include assembly orientation, retention, strain relief and inspection requirements in the release. Test a representative mated first article for the relevant electrical and mechanical behavior. Record the approved mating parts and alternatives so purchasing cannot inadvertently change the interface.