Electroless nickel / immersion gold (ENIG) is a RoHS compliant finish that provides a very planar surface, a very reliable solder joint and is very resistant to environmental storage conditions, handling etc. ENIG is available on all PCBs configurations except ValueProto®.
The electroless nickel step is an auto-catalytic process that involves deposition of nickel on the palladium-catalyzed copper surface. The reducing agent, containing nickel ions, must be replenished in order to provide proper concentration, temperature and pH levels necessary to create a consistent coating. During the immersion gold step, the gold adheres to the nickel plated areas through molecular exchange, which will protect the nickel from oxidation until the soldering process occurs. The gold thickness needs to meet certain tolerances to ensure that the nickel maintains its solderability.
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Sunstone Circuits® is the established leader in providing innovative and reliable printed circuit board (PCB) solutions for the electronic design industry. Since 1972, Sunstone Circuits has delivered high quality, on-time PCBs and is committed to improving the prototyping through production processes for the design engineer from quote to delivery. With white-glove support, Sunstone Circuits provides unparalleled customer service and leads the industry with over 99% on-time delivery.