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A surface finish can be either organic or metallic in nature. Comparing both types and all available options can quickly demonstrate the relative benefits or drawbacks. Typically, the decisive factors when it comes to selecting the most suitable finish is the end application, the assembly process and the design of the PCB itself. Below you can find a brief summary of the most common finishes, however for further or more detailed information, please Contact Us and we will be more than happy to answer any of your questions.
Immersion Sn – Immersion Tin
Typical thickness ≥ 1.0µm. Shelf life: 6 months
ISn offers a chemically stable, low foaming and efficient application process that delivers excellent Pb-leaded and Pb-free solderability and an extremely planar surface. Exceptionally reliable with a high resistance to corrosion, ISn enables effortless thickness control while maximizing bath and process stability. This ultimately results in higher yields and less overall waste.
- Immersion finish = excellent flatness
- Good for fine pitch / BGA / smaller components
- Mid range cost for lead free finish
- Press fit suitable finish
- Good solderability after multiple thermal excursions