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SITCSection 7
U.S. imports of low-power transistors (under 1 watt dissipation) (SITC 77632) totaled $20.7M in July 2026, traded with 36 countries.
Importers of Low-Power Transistors (Under 1 Watt Dissipation) paid $658K in duties in July 2026 — an effective duty rate of 49% on $1.4M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataTransistors with a dissipation rate below 1 watt — the signal-level and small-signal BJTs, JFETs, and MOSFETs that populate SITC 77632 — are among the highest-volume discrete semiconductor devices in global trade, used in amplification, switching, and logic functions across consumer electronics, automotive, and industrial controls. The 1-watt dissipation threshold is the defining classification boundary separating these low-power devices from their higher-power counterparts in 77633, and the distinction is based on the device's rated maximum power dissipation as stated by the manufacturer. Section 301 tariff exposure applies to Chinese-origin transistors, reinforcing the importance of accurate origin documentation.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
1.2K shipments/mo
Basic heading 342 of 642 in section 7
Basic heading 77632 · $20.7M of $175.6B
The classification boundary is the transistor's maximum rated power dissipation as published in the manufacturer's datasheet — not its typical operating power in a given circuit. A device rated at 900 mW maximum dissipation belongs in the sub-1-watt heading (77632), while one rated at exactly 1 watt or higher falls into 77633. Importers should retain datasheets as supporting documentation in case CBP requests verification.
No. Photosensitive transistors — phototransistors used in optical sensing and optocoupler applications — are explicitly excluded from both 77632 and 77633 and are instead classified under the photosensitive semiconductor devices heading (77637). This distinction matters for importers of optocoupler components, which contain a phototransistor output stage and must be classified accordingly.
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Imports · July 2026
origin
Japan and Austria together supply 61% of it.
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
$20.7MYoY · Pro
Exports
$12.6MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.