A connector pin map can be internally consistent and still be mirrored at the interface. The common cause is comparing a mating-face view with a board-side or termination-side view as though they were the same. Review the complete mating pair before approving the footprint or cable drawing.
Use the exact configured part numbers. Samtec’s HLE product page, for example, directs designers to confirm the configuration using its series print and cautions that a displayed two-dimensional view may not represent the selected configuration. A familiar product image is not an adequate numbering reference.
Label each view before tracing a signal
Place the connector drawing, recommended footprint, and mating-part drawing side by side. Write the viewing direction beside each one. Mark the key, latch, pin-one feature, and board surface. Preserve those annotations when the interface drawing is copied into an assembly instruction. If a view is unclear, resolve it with the manufacturer before inferring the orientation from symmetry.
For a cable interface, add the wire-entry view and assembly orientation. A connector can mate mechanically while the cable’s termination map is reversed. The diagram should show the actual path from board pad to contact to wire or opposing board pad.
Build a small interface map
| Interface record | Example of what to enter |
|---|---|
| Source endpoint | Board A, connector reference, pad identifier, and signal |
| Mating contact | Contact identifier in the specified viewing direction |
| Destination endpoint | Cable conductor or Board B pad and intended signal |
| Orientation evidence | Drawing revision and keyed feature used for alignment |
Trace at least one nonsymmetric set of signals, such as power, return, and a uniquely named control line. Checking only repeated ground contacts can miss a reversal because both orientations appear plausible.
Check the installed arrangement
- Verify the footprint’s board side and rotation.
- Confirm the opposing connector’s installed orientation.
- Check keying and access in the mechanical assembly.
- Compare the assembly drawing with the interface map.
- Where practical, verify a physical sample pair with an appropriate continuity check before power is applied.
A three-dimensional model helps explain orientation but should not be the sole authority for electrical numbering. Models may omit contact identifiers or represent a related configuration. Preserve the numbered drawing as part of the library evidence.
Revisit the map when changing connector sex, entry direction, stacking arrangement, or cable vendor. These are interface changes even when pitch and contact count remain the same. The pin-map audit covers the complementary check within each board’s symbol and footprint.
Move from reading to a build-ready project
Use the fabrication and assembly checklists to prepare drawings, production files and test requirements.
Open the DFM checklist