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
|
