Choose a PCB header pitch from the current path, board density and assembly process together, not from the smallest catalogue value. Fix the system constraints first and let the pitch follow them.

Contents

• Part 1. Why is pitch a system decision rather than a catalogue pick?
• Part 2. How do current and contact size interact with pitch?
• Part 3. How does pitch shape PCB routing and density?
• Part 4. What assembly-process limits apply to finer pitches?
• Part 5. How should mating force and alignment be reviewed?
• Part 6. What should a pitch decision record contain?
• Part 7. Which ZUCH route supports a header pitch inquiry?
• FAQ
• References

Part 1. Why is pitch a system decision rather than a catalogue pick?

Pitch is the centre distance between adjacent contacts, and it constrains contact size, creepage on the board, routing channels and mating force at the same time. Selecting it in isolation usually surfaces later as a layout, thermal or assembly problem.

Part 2. How do current and contact size interact with pitch?

Smaller pitches generally mean smaller contact cross-sections and closer heat sources, so the usable current per contact tends to fall. Review the rated conditions behind any current figure and plan a temperature-rise check in the real contact grouping.

Part 3. How does pitch shape PCB routing and density?

The footprint sets pad sizes, drill or paste geometry and the routing channels between pads. Confirm with the board fabricator that trace width, annular ring and solder-mask capabilities support the candidate pitch before the schematic team locks the pin count.

Part 4. What assembly-process limits apply to finer pitches?

Finer pitch tightens placement accuracy, paste volume control and inspection requirements, and it raises the cost of rework. Ask the assembler which pitch classes their lines run routinely and what inspection coverage they apply.

Part 5. How should mating force and alignment be reviewed?

Total mating force grows with contact count, and fine-pitch interfaces leave less room for misalignment. Check the mating direction, operator access, board support and any guiding features in the housing before fixing pitch and positions.

Important: General guidance cannot approve a specific design or lot. This is a source-note application of the IPC and TE Connectivity references listed below; apply it through your controlled drawing and acceptance plan.

Part 6. What should a pitch decision record contain?

Record the electrical requirement per contact, layout constraints, assembly capability confirmations, candidate pitch and the samples or checks that closed each risk. That record keeps later footprint changes deliberate instead of accidental.

Part 7. Which ZUCH route supports a header pitch inquiry?

Use ZUCH’s PCB Header category and the live product catalogue to identify relevant connector, terminal or housing component families. These are discovery routes only and do not demonstrate that a specific configuration is approved for your application.

RFQ inputs

1. Circuit count, current per contact and voltage context for the interface.
2. Board space, footprint constraints and fabricator capability notes.
3. Assembly process, inspection coverage and rework expectations.
4. Samples, drawings and validation evidence required before release.

Fit Boundary

This guide supports engineering and sourcing discussion; it cannot replace programme-specific validation, market requirements, or an approval record. Use ZUCH’s sample request route or contact page for controlled component documentation and samples.

FAQ

What does pitch mean on a PCB header?

Pitch is the centre-to-centre distance between adjacent contacts, and it drives contact size, footprint geometry and routing space.

Is a smaller header pitch always better for dense boards?

No. Finer pitch buys density but costs current capability, process window and rework tolerance, so the trade must match the application.

How does pitch affect current rating?

Smaller pitches usually pair with smaller contacts and closer heat sources, so usable current per contact tends to drop; verify with a temperature-rise check.

What should I confirm with the board fabricator?

Pad, drill, solder-mask and routing capabilities at the candidate pitch, so the footprint is manufacturable at normal yield.

What should I confirm with the assembler?

Which pitch classes their placement, soldering and inspection processes run routinely, and how rework is handled at that pitch.

Can I mix header pitches in one product?

Yes, and it is common: use the pitch each interface needs, but manage part variety and mis-mating risk deliberately.

What belongs in a PCB header pitch RFQ?

Include circuit count, electrical duty, footprint constraints, process assumptions, required samples and the validation evidence you expect.

References

• IPC standards overview
• TE Connectivity interconnect resources