Surface Finishes


 Finishes

Pros

Cons

 Electroless Nickel  Immersion Gold - ENIG
  • Excellent Coplanarity
  • Very good shelf life
  • Excellent Reflow Cycles
  • Excellent Surface Oxidation
  • Wire Bonding
  • Moderate cost
  • Complex process
  • Not re-workable
 Immersion Silver
  • Good Coplanarity
  • Good Surface Oxidation
  • Re workable
  • Low Cost
  • Good Process Control & Window
  • Must be packed using Sulphur-free paper
  • Poor shelf Life
 Hard Gold
  • Good Coplanarity
  • Good Surface Oxidation
  • Good Process Control & Window
  • Good Adhesion
  • High Cost
  • Not re-workable
  • Brittle Au/Sn joints
 HASL
  • Good Coplanarity
  • Excellent Surface Oxidation
  • Re workable
  • Very Low Cost
  • Very Good Shelf Life
  • Excellent Reflow Cycles
  • Excellent Wettability
  • Not good for Surface mount with fine pitch
 Immersion Sn
  • Good Coplanarity
  • Good Surface Oxidation
  • Re workable
  • Low Cost
  • Good Process Control & Window
  • Whickering
  • Poor shelf Life