Do you offer PCB Variety Finishes?
If copper is left unprotected, it oxidises and becomes unusable. PCB Variety Finishes are applied to protect the copper also primes the PCB surface on the pads, ready for soldering.
As standard, we use HASL (Hot Air Solder Leveling). The PCBs are immersed in molten tin alloy and the HASL machine removes the excess with a blast of hot air, leaving the surface mount pads perfectly flat for soldering and all the plated-through-holes clean for assembly. It is also lead-free and compliant with RoHS requirements
The other PCB coatings we offer to special requirement are Electroless Nickel Immersion Gold (ENIG) and Immersion Silver.
Electroless Nickel Immersion Gold (ENIG). This two-layer metallic coating gives improved performance for surface mount technology, particularly for fine pitch devices. It is also lead-free and compliant with RoHS requirements. The nickel layer protects the copper and provides a surface for soldering. The gold acts as a protective layer whilst reducing resistance.
Immersion Silver coating of PCB pads is also an option for lead-free applications which are RoHS compliant, but is rarely used.
For more advice about PCB finishes, please call us on 01462 417400 at any time.