My guess would be ENIG like on a PCB. Electroless Nickel Immersion Gold. The data sheet or the vendor's website would tell you the exact finish.
Terry On Saturday, August 17, 2019 at 9:56:24 PM UTC-5, Paul Andrews wrote: > > > What is the gold/amber colored coating on the contacts of this chip? The > contacts aren't gold, and when it is reflowed it just bubbles up as gunk. > > > <https://media.digikey.com/Photos/Espressif%20Systems/MFG_ESP32-PICO-D4.jpg> > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/4383d9a8-899c-4cca-8f20-590efa5c81f7%40googlegroups.com.
