5. Are tin-plated connectors OK for my application?
But with gold at more than $1400 per ounce, using gold adds expense, especially if it can be avoided in your application. For example, you won’t find gold plating on your 120 or 220 V wall plug because the voltage is high enough that the electricity will flow right through normal surface contamination. But we seldom use such high voltage levels past the transformer in the electronics box.
So when can you get away with tin-plated interfaces?