Electronic – White solder pads on through-hole PCB

pcbsoldering

They look like covers at first glance but they aren't stickered on. I've never seen pads like this and searching doesn't bring up any results. Any information on these?

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Best Answer

It's a PCB finish, called Immersion Silver, or IS for short.

Some other common types of finishes:

  • Hot air-levelled solder (HASL) - Just your normal solder, levelled with hot air knives.
  • Electroless Nickel Immersion Gold (ENIG) - Your typical matte gold.
  • Galvanic Gold - Different type of gold finish, looks shiny and polished.
  • Organic Solderability Preservative (OSP) - Looks like bare copper.
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