Surface Finish Selection: HASL, ENIG, OSP
HASL is cheap and robust; ENIG gives flat gold for fine pitch; OSP is lead-free and cheap but fragile in storage.
HASL
Lead-free HASL is economical but uneven for fine pitch.
ENIG
Flat, wire-bondable, ideal for BGA and press-fit.
OSP
Cheap and flat, sensitive to handling and time.
Key Takeaways
Key Takeaways
- Match finish to pitch and budget.
- ENIG for fine-pitch BGA.
- Handle OSP gently and quickly.
