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SITCSection 7
U.S. imports of high-power transistors (1 watt or more dissipation) (SITC 77633) totaled $119.3M in July 2026, traded with 47 countries.
Importers of High-Power Transistors (1 Watt or More Dissipation) paid $2.6M in duties in July 2026 — an effective duty rate of 42% on $6.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. High-Power Transistors (1 Watt or More Dissipation) imports of $119.3M in July 2026 ran 15% above the year-to-date monthly average of $103.7M.
Last updated: July 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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7.6K shipments/mo
Basic heading 136 of 642 in section 7
Basic heading 77633 · $119.3M of $175.6B
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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Imports · July 2026
origin
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$119.3MYoY · Pro
Exports
$130.9MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.