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OSP
ENEPIG
ENIG
HASL
Pb-free HASL
Immersion Silver
Deep Gold
Immersion Tin
Soft, Wire Bondable Gold
ENIG

enig-finish


Definition
Provides an electroless nickel / immersion gold finish that can meet the requirements for:

  • Solderability
  • Aluminum wire bonding
  • Electric Contact Surface
  • Multiple Reflows

 

Benefits

  • A planar, solderable finish
  • Good shelf life – Does not tarnish
  • Precious metal electrical contact surface (1.5 million actuations)
  • Al wire bondable
  • Nickel strengthens the PTH – acts as a rivet
  • Nickel barrier prevents copper dissolution during wave solder & rework
  • EMI shield mounting surface
  • Withstands multiple heat cycles well

 

Limitations

  • Expensive
  • Nickel layer prone to crack from mechanical stress