HS Code for Signal Transistors
The HS Code for signal transistors is 854121. The MFN duty rate for importing to the US is Free.
| HS Code (6-digit) | 854121 |
|---|---|
| US Duty Rate (MFN) | Free |
| EU Duty Rate (MFN) | 0% |
| Chapter | 85 |
| Heading | 8541 |
| Last Updated | 2026-05 |
Description
Transistors, other than photosensitive, with dissipation rate < 1 W
HS Code 854121 covers low-power signal transistors with a dissipation rate under 1 watt, and they enter the United States duty-free.
Frequently Asked Questions
What are the best practices for packaging and shipping signal transistors (HTS 854121) to prevent electrostatic discharge damage during transit?
Signal transistors must be shipped in static-shielding bags (such as metallized polyethylene) or conductive foam, placed inside a rigid outer container. All packaging materials should meet the ESD Standard ANSI/ESD S20.20, and the shipment must be clearly marked with 'ESD Sensitive Device' labels on the exterior to alert handlers.
What is the specific US import restriction for Chinese-origin signal transistors under HTS 854121 due to Section 301 tariffs?
Signal transistors (HTS 854121) of Chinese origin are subject to an additional 25% ad valorem tariff under List 1 of the US Section 301 actions. This duty is assessed in addition to the general Column 1 rate of Free and must be declared using HTSUS subheading 9903.88.01. Importers cannot use the Chapter 98 provisions for goods returned after repair or alteration to avoid this tariff.
How does the semiconductor material (e.g., silicon vs. gallium arsenide) affect the classification of signal transistors under HTS 854121?
For HTS 854121, the semiconductor material is generally not the primary classification factor, as the heading covers all transistors with a dissipation rate below 1 W. The key determiners are the device's function (signal amplification/switching) and its power dissipation rating. However, the specific material composition may become relevant if it incorporates precious metals or rare-earth elements, potentially triggering additional reporting requirements.
Country-Specific Import Restrictions for Signal Transistors
Signal transistors (HTS 8541.21) are generally not subject to broad import bans, but specific country-of-origin restrictions can apply due to trade sanctions. For example, transistors manufactured in Russia under headings 8541.21.60 or 8541.21.80 are prohibited from import into the United States under sanctions implemented after 2022 (see 15 CFR § 746.8). Imports of certain high-power or high-frequency signal transistors may also face additional licensing requirements from agencies like the BIS when destined for sensitive end-uses or entities. It is critical to verify the latest sanctions lists from OFAC and the Commerce Department for any target-specific restrictions that could affect your supply chain.
Common Classification Mistakes for Signal Transistors
A frequent error is misclassifying these as power transistors under heading 8541.29. Signal transistors (8541.21) are specifically for switching or amplification with a power dissipation of less than 1 watt. Ensure the device's technical datasheet confirms the power rating to avoid this. Another mistake is classifying integrated circuits containing multiple transistors as individual transistors; such assemblies generally belong under heading 8542.
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