Silicon Zener Diode Wafer from China
300mm silicon wafers patterned with Zener diode structures for voltage regulation in power supplies and protection circuits. These unseparated wafers undergo diffusion and metallization processes before dicing. Fits HTS 8541.10.0040 for unmounted diode wafers excluding photosensitive or LED variants.
Duty Rate — China → United States
50%
Rate breakdown
9903.91.0550%Effective with respect to entries on or after January 1, 2025, articles the product of China, as provided for in subdivision (f) of U.S. note 31 to this subchapter
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Certify wafer flatness specs (TTV <1μm) and resistivity values to confirm diode-specific fabrication
• Submit process flow diagrams showing diode junction formation to prevent misclassification as bare silicon wafers
• Monitor export controls; certain high-voltage Zener wafers may require dual-use licenses