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SITCSection 7
U.S. imports of high-power transistors (1 watt or more dissipation) (SITC 77633) totaled $111.3M in April 2026, traded with 43 countries.
Importers of High-Power Transistors (1 Watt or More Dissipation) paid $3.3M in duties in April 2026 — an effective duty rate of 25% on $13.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. High-Power Transistors (1 Watt or More Dissipation) imports of $111.3M in April 2026 ran 15% above the year-to-date monthly average of $97.0M.
Last updated: April 2026 dataPower transistors rated at 1 watt or more — including power BJTs, IGBTs, and power MOSFETs used in motor drives, power supplies, RF amplifiers, and automotive inverters — are classified under SITC 77633 and represent a strategically important segment of the discrete semiconductor market. The automotive electrification trend has significantly elevated demand for high-power IGBTs and SiC MOSFETs, which fall within this heading's scope. As with other transistor categories, photosensitive devices are excluded, and the 1-watt dissipation threshold is the key boundary with the lower-power heading.
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Yes, wide-bandgap power transistors based on SiC or GaN substrates — provided they are not photosensitive — classify under the transistor headings based on their dissipation rating, just as silicon-based devices do. The semiconductor material does not change the SITC classification; what matters is the device's function as a transistor and its rated power dissipation. Importers of SiC MOSFETs and GaN HEMTs for EV and power electronics applications should confirm the applicable HTS 10-digit subheading, as these newer device types may require additional classification analysis.
High-power transistor fabrication is more capital-intensive and concentrated among a smaller number of specialized fabs, with significant production in Japan, Germany, and China. The automotive and industrial end-markets impose stringent qualification requirements (AEC-Q101 for automotive, for example), meaning that switching suppliers is slower and more costly than for commodity signal transistors. This concentration creates lead-time and allocation risk that procurement teams should factor into inventory planning.
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Monthly import values over time