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PCB Surface Finish (ENIG, HASL, OSP)
- 1. Will copper traces at the board edge be plated or left bare?
- 2. Can I use ENIG for gold fingers, or is hard gold required?
- 3. Which PCB solder mask colors are available, and does color affect lead time?
- 4. When should I choose HASL vs ENIG surface finish for PCB?
- 5. Is lead-free HASL (SAC305) available and RoHS compliant?
- 6. What is the shelf life of OSP PCB surface finish?