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Surface Finishes

Either ENIG or OSP are the best PCB finishes simply because they provide the flattest surface possible. HASL has a bumpy surface, while immersion silver poses corrosion issues and shelf life limitation. Both are not recommended as a result.

ENIG or gold is the best finish, not only because it has a flatter finish, but also because it is considerably more robust during BGA rework. Plus, it is cost-effective today, although a while back gold was slightly more expensive. Today, gold and HASL are about the same price.

Factors to consider when choosing a surface finish are:

  • Function
  • Cost
  • Solderability
  • Shelf life
  • Global availability

Not all finishes are equal, aside from cost, function is a primary concern not
merely for the topography for fine pitch devices but  also for loss characteristics.

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To speak to a BGA specialist, please call us at 1.866.845.1197 or email us at info@bga.net.

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