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SITCSection 7
U.S. imports of low-power transistors (under 1 watt dissipation) (SITC 77632) totaled $22.0M in April 2026, traded with 30 countries.
Importers of Low-Power Transistors (Under 1 Watt Dissipation) paid $1.2M in duties in April 2026 — an effective duty rate of 45% on $2.7M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 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.
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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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Monthly import values over time