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Printed Circuit Board (PCB) surface finishes are critical in the development of the PCB assembly. Surface finishing in PCB provides a solderable surface between the components and the PCB assembly and prevents the assembly from oxidation. There are different types of surface finishing available in the market. Each of the surface finishing types has its own pros and cons depending upon the application requirement. Therefore, it becomes important to select right surface finishing for the PCB assembly. Are you confused between the different types of surface finishing on the PCB? If, yes then you consider reading this post, which discusses some of the popular surface finishing types, and their impact on the PCB assembly.
Surface finishing in PCBs is decided on the basis of several factors. These factors include price, reliability, assembly processing, performance requirement, and material costs. Below are some of the common surface finishing types available for all printed circuit boards.
Hot Air Solder Level finishing or HASL is a ROHS-compliant type of surface finishing performed on printed circuit boards. This type of surface finishing is done by dipping HASL circuit boards into molten soldering substrate.
Advantages of HASL
Disadvantage of HASL
Immersion silver is a ROHS directed surface finishing, which has gained immense popularity in the recent years. This type of surface finishing provides a reliable solder joint on various circuit boards. Immersion silver surface finishing is best suited for Surface Mount Technology (SMT) applications.
Advantages of Immersion Silver
Disadvantages of Immersion Silver
OSP (Organic Solderability Preservative) is an organic-based surface finishing used in printed circuit boards. It protects the copper surface from oxidation before the soldering process. This type of surface finishing is robust and is specially designed for lead-free assemblies.
Advantages of OSP
Disadvantages of OSP
As discussed above, various surface finishing plays a key role in the protection of PCB from environmental elements. Read the next post to understand more some more PCB surface finishing options and their underlying impacts.