Understanding Lead-Free PCB Surface Finishes

With global regulations like RoHS (Restriction of Hazardous Substances), lead-free surface finishes have become a priority. What are the best lead-free options for PCB manufacturing?

Top Lead-Free PCB Finishes

• Lead-Free HASL – Cost-effective alternative to traditional HASL, but may still have uneven surfaces.
• ENIG (Electroless Nickel Immersion Gold) – A top choice for fine-pitch and high-reliability applications.
• OSP (Organic Solderability Preservative) – A budget-friendly solution for short shelf-life PCBs.
• Immersion Silver – Offers high conductivity, but requires careful storage to avoid oxidation.

Which One is Best?

For high-end applications like medical devices or aerospace, ENIG is the best choice. For low-cost, high-volume production, lead-free HASL or OSP can be sufficient.