When placing a lead-free order, simply choose the "Silver (RoHS)" or "ENIG (RoHS)" option for surface finish. Also, please review the information below before ordering your lead-free material boards.
More information on RoHS-compliant boards and the RoHS Directive can be found online.
We use High Tg, High Td, and Low CTE laminate which complies with all RoHS requirements and can withstand several heat cycles. Review our Final Finish Comparison Matrix for more details on ROHS-compliant boards and lead-free PCB materials.
For immersion processes such as silver, ENIG, tin and OSP, it is recommended by the manufactures of those products that via holes be cleared of soldermask to assure proper coverage and good rinsing. Not everyone adheres to this process, but we strongly recommend it.
Unless specifically asked by a customer NOT to modify the soldermask via clearances, we will add or adjust the via clearances so they are slightly larger then the drilled hole. This will leave the hole open and the edges of the pad covered. For the customer, this simply means that you do nothing, we will take care of it.
Customers will often already have a soldermask clearance over the whole pad, in this case we will not make any changes.
Thank you and we look forward to your lead-free PCB material order through Sunstone Circuits.