Photovoltaic cells and modules (854142 and 854143) have been subject to antidumping and countervailing duty orders targeting multiple origins, as well as Section 201 safeguard tariffs and Section 301 measures for Chinese-origin goods. The applicable measures depend on the specific country of origin and product configuration; importers should conduct a line-by-line review and monitor CBP scope rulings, as circumvention findings have expanded coverage to additional countries.

A bare LED die or packaged LED component — the semiconductor device itself — classifies under 854141 in heading 8541. Once that component is integrated into a complete lamp assembly with a driver and standard base, it becomes an LED lamp (853952), and an intermediate assembly of LEDs on a circuit board designed as a lighting component becomes an LED module (853951). The key question is whether the article is a discrete semiconductor device or a finished lighting product.

Mounted piezoelectric crystals (854160) are industrial components with no mandatory admissibility review beyond standard customs entry. However, crystals destined for defense or dual-use applications may require an export license from the country of origin and should be reviewed against Export Administration Regulations if re-exported. Classification accuracy matters because unmounted crystals classify differently.