2.54 mm Single-Row Pin Header Footprint and DFM Practical Guide

2.54 mm 1×N vertical pin header is a through hole package used for through hole assembly, also seen labeled 0.1-inch header, single-row breakaway header, 1×N P2.54. A dependable footprint follows the exact orderable-device drawing rather than the family name: nominal body Typically 2.54 mm wide; length is N × 2.54 mm, overall span Post and insulator height are part-specific, seated height Common insulator 2.5 mm plus mating posts, pitch 2.54 mm, pin count Variable 1×N row, and exposed pad Plated through-hole annuli.

Use the selected post diagonal and plating tolerance; common 0.64 mm square posts often need about a 1.0 mm finished hole, but verify the drawing.

Typical uses include development breakouts, jumpers, board-to-board sockets. 2.54 mm pitch is standardized in use, but post size, shoulder, insulator, plating, and recommended hole are supplier-specific.

• A square post's diagonal, not its 0.64 mm flat width, is the insertion limit. Row length and end overhang depend on the actual insulator.
• The finished hole must fit the lead at maximum material condition plus insertion tolerance and plating; the drill file normally specifies the pre-plating tool size.

Reserve mating-connector height and cable access, keep copper away from the connector body, and mark pin one at both mating views.

• Reserve the full connector or component envelope on both sides, include mating and wire-entry space, and keep copper clear of hardware and hand-tool access.

Hand assembly is rated easy. Hand or wave solder with the header held square in a fixture. Watch for header leaning, undersized finished holes, and reversed pin-one labels.

• Choose annular rings for drill registration and use a solder fixture on long strips so every post stays normal to the board.
• Choose annular rings from the fabricator's registration allowance and confirm whether slots, press-fit holes, or non-plated features need separate drill outputs.
• Account for wave or selective solder orientation, pallet access, thermal spokes, and bottom-side protrusion before panel release.

Inspection focus:

• Inspect seating, verticality, barrel fill, and pin-one identity, then mate the actual socket across the full row without forcing it.
• Inspect barrel fill, wetting around the lead, polarity, seating, and mechanical alignment; continuity alone does not prove a durable connector joint.

Common mistakes:

• Sizing the finished hole to the square post's side rather than its diagonal can make production headers impossible to insert.
• Do not use nominal lead width as the finished-hole size or forget that plating reduces the hole after drilling.

1. Before approving 2.54 mm 1×N vertical pin header, compare the exact orderable-device drawing with the library item: body range (Typically 2.54 mm wide; length is N × 2.54 mm), terminal or lead span (Post and insulator height are part-specific), pitch (2.54 mm), pin count (Variable 1×N row), height (Common insulator 2.5 mm plus mating posts), and exposed-pad definition (Plated through-hole annuli). Record the source drawing revision and every intentional courtyard, toe, heel, side, mask, or paste adjustment.
2. Treat the easy hand-solder rating as a prototype-planning input, not proof of production yield. Review header leaning, undersized finished holes, and reversed pin-one labels with the assembler, confirm that hand or wave solder with the header held square in a fixture is compatible with the build, and require the S1 connectivity gate plus relevant S2 geometry checks to pass against the released footprint and selected fabrication profile.

Manufacturing gate checks:

1. S1Pad count, numbering, and schematic parity. Pin count, row pitch, finished-hole size, numbering direction, and remaining annular ring must match the exact header drawing.
2. S2Finished-hole tolerance and annular ring. The lead must insert after plating while retaining enough copper for registration, solder fill, and mechanical load.
3. S2Finished-hole size and annular ring. Drill, plating, lead tolerance, and the remaining annular ring must agree with the fab capability.