Connector mating cycles calculator — plating life

Estimate the useful mating-cycle life of a connector from its plating and contact construction — the check before choosing gold flash vs thick gold vs tin.

Contact & use

Contact plating

Standard high-reliability gold

Contact construction

Machined contacts typically survive more cycles than stamped & formed.

Expected cycles per year

How often the connector is mated and unmated

Target product life

Years the product is expected to stay in service

Typical mating cycles: 375cycles
Cycle range: 250–500cycles
Mating cycles needed over product life: 1,000cycles
Estimated life at your mating rate: 3.8years

This plating is exhausted about 6 year(s) before the target product life — step up to thicker gold.

Figures are typical stamped & formed signal-contact values from connector manual guidance. Gold flash ≈ 50 cycles, 5µ” ≈ 100–250, 10µ” ≈ 250–500, 15µ” ≈ 500–1000, 30µ” ≈ 1000+. Tin under 50 cycles is for high-contact-force power contacts only.

Plating reference

Plating	Typical cycles	Use
Tin	10–50	High contact force only — oxidises quickly
Gold flash	≤50	Thin — wears through in a few dozen cycles
Gold 5µ"	100–250	Entry-level gold, most signal connectors
Gold 10µ"	250–500	Standard high-reliability gold
Gold 15µ"	500–1000	Long-life / harsh-environment gold
Gold 30µ"	1000+	Heavy gold for continuous mating

Golden rule: never mix a tin pin with a gold socket — the dissimilar metals form a galvanic cell and corrode the gold surface. Keep the mating pair on the same plating.

About mating cycles

Every mating and unmating cycle wears the plating at the contact interface. Gold resists oxidation, so contact resistance stays under ~10 mΩ for hundreds of cycles; tin oxidises within days and relies on wiping and high contact force to punch through its oxide. Picking plating for the product life — not just the first mated hour — is what keeps a connector reliable over years.

Related parts

Browse related parts:

connectors contacts / sockets crimp terminals

Frequently asked questions

How many mating cycles does gold plating survive?

It depends on the gold thickness. Typical stamped and formed signal-contact figures used here are: gold flash about 50 cycles, 5 micro-inch gold 100–250, 10 micro-inch 250–500, 15 micro-inch 500–1000 and 30 micro-inch 1000 or more. Tin is limited to roughly 10–50 cycles and is meant for high-contact-force power contacts only.

Why do gold contacts last longer than tin contacts?

Gold resists oxidation, so contact resistance stays under roughly 10 mΩ across hundreds of mating cycles. Tin oxidises within days and relies on wiping and high contact force to punch through the surface oxide, so the plating wears out much sooner at the contact interface.

How do I convert mating cycles per year into connector life?

The calculator divides the plating’s typical cycle budget by your expected cycles per year. At the defaults (100 cycles per year, 10 micro-inch gold on a stamped and formed contact, about 375 typical cycles) the life is roughly 3.8 years, short of a 10-year product life — thicken the gold to 15 or 30 micro-inch for long service.

How it works

IC Source Direct estimates mating-cycle life the way connector manuals do: each plating thickness carries a typical cycle budget, and the budget is divided by your expected cycles per year to give a life in years. Gold resists oxidation, so a plated contact keeps its resistance under roughly 10 mΩ for hundreds of cycles; tin relies on high contact force to break through surface oxide and wears out sooner. Matched plating on pin and socket avoids galvanic corrosion between dissimilar metals.

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IC Source Direct provides this tool for reference only.

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