PCB Connectors: Pin Headers & Dupont Sourcing China
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This tag covers board-level connectors sourced from China — pin headers and Dupont (jumper) connectors in 2.54mm, 2.0mm, and 1.27mm pitch, in SIL/DIL configurations and both through-hole and SMD mount. Plating is the spec that separates a reliable part from a failure: brass with thin tin plating corrodes, while gold plating over nickel holds up to repeated mating. Current rating per pin (often 1–3A for 2.54mm) is the other number buyers overlook.
When you source these, the cheap trap is underspecified plating — a 'gold' header may have a flash so thin it wears through after a few insertions. We check plating thickness and base metal, and confirm pitch tolerance, since out-of-spec pitch causes alignment problems on automated assembly.
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FAQ
Does plating really matter on a cheap pin header?
Yes — thin tin or flash-gold plating corrodes or wears through, causing intermittent contacts. For anything that gets re-mated or sits in humidity, specify gold over nickel with a stated thickness.
What pitch should I order for jumper wires?
2.54mm (0.1 inch) is the universal standard for breadboards and Dupont jumpers; 2.0mm and 1.27mm are used in compact designs. Match the pitch to your board footprint exactly, since mixed pitches don't mate.
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