Marking "LF" means Lead Free

First some background information. It is important to understand that the industry is transitioning to RoHS compliant products. RoHS restricts the use of 6 materials. One of the 6 restricted materials is Pb. RoHS compliant products are not completely Pb free. There are exemptions in RoHS allowing the use of Pb in some very limited locations in electronic products, and/or in some applications. In addition, Pb maximum concentration values have been established for RoHS compliant electronic products that allow up to 1000 ppm of Pb. Pb is the most common and problematic of the 6 restricted materials and therefore "Pb-free" is a nickname that is often used (or misused) for RoHS compliant products.

The term "Lead-free / Pb-free" means that Pb has been removed where required by the RoHS legislation. Pb may exist as an impurity below 1000ppm.