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Postby admin » Thu Feb 05, 2015 8:55 am

OSP PCBs full name
Organic Solderability Preservative, or OSP is a method for Coating printed circuit boards.

OSP PCBs definition
It uses a water-based organic compound that selectively bonds to copper and protects the copper until soldering.
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Postby jim » Fri Feb 06, 2015 1:54 am

PCB coating aim
During the PCB manufacturing process, exposed copper traces must be treated with an anti-corrosion coating.

HASL coating board info
Traditionally, it is coated with solder by Hot Air Solder Leveling (HASL).
The HASL finish prevents oxidation of the underlying copper and therefore guarantees a solderable surface.

OSP coating VS. HASL coating
Although this is a sound approach, Organic Solderability Preservatives (OSP’s) have become prevalent in the electronics industry as an alternative to the HASL process.

Even though this is a reliable surface finish method, care must be taken during the SMT process to minimize surface thickness degradation, particularly due to reflow and cleaning.
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