Silicon NPN Power Transistor Wafer
Thin silicon wafers containing thousands of unmounted NPN bipolar junction transistor dice, designed for dissipation rates under 1W, used in consumer electronics like smartphones and amplifiers. Classified under HTS 8541.21.00.40 as unmounted chips, dice, and wafers of transistors other than photosensitive types with dissipation less than 1W.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If dissipation rate 1W or greater
Higher dissipation transistors fall under the general subheading without the <1W specification.
If mounted or assembled into discrete packages
Mounted or packaged transistors are classified as complete electronic integrated circuits.
If imported as doped semiconductor material before dicing
Undiced doped silicon wafers may classify as chemical preparations rather than devices.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide detailed specifications confirming dissipation rate <1W and unmounted status to avoid reclassification as mounted devices
• Use ESD-protected packaging and include material safety data sheets for hazardous substances compliance
• Verify country of origin documentation as many wafers originate from sensitive supply chains
Related Products under HTS 8541.21.00.40
MOSFET Driver Wafer
Silicon wafer containing unmounted MOSFET driver transistor chips for low-power switching applications in power management ICs, with dissipation rates below 1W. Falls under HTS 8541.21.00.40 as unmounted transistor wafers other than photosensitive.
SiGe HBT Transistor Die
Silicon-Germanium Heterojunction Bipolar Transistor dice for high-frequency applications in 5G base stations, unmounted with <1W dissipation. Classified under HTS 8541.21.00.40 as non-photosensitive transistor chips.
Automotive Grade MOSFET Wafer
Unmounted MOSFET wafers AEC-Q101 qualified for automotive applications like ECUs and sensors, dissipation under 1W per die. HTS 8541.21.00.40 for unmounted low-power transistor wafers.
Darlington Transistor Chip Array Wafer
Silicon wafer with unmounted Darlington transistor pair chips for high-current switching applications under 1W total dissipation. Covered by HTS 8541.21.00.40 as unmounted transistor dice.
GaAs RF Transistor Die
Gallium Arsenide (GaAs) transistor dice optimized for RF applications with dissipation under 1W, used in wireless communication devices like cell phones and WiFi modules. HTS 8541.21.00.40 applies to these unmounted chips for non-photosensitive transistors.
Low-Noise Amplifier Transistor Chip
Unmounted silicon chips of low-noise transistors designed for audio and RF preamplifiers with dissipation under 1W, used in hearing aids and professional audio equipment. Classified in HTS 8541.21.00.40 for unmounted transistor dice.