Gun Diode (Gunn Diode) for Microwave from China
Gunn diodes generate microwave frequencies through negative resistance effect, used in radar, police speed guns, and motion detectors. As bulk semiconductor transfer electron devices functioning as diodes, they classify under HTS 8541.10.00.
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
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Require FCC/ITAR certifications for microwave devices; declare oscillation frequency precisely
• High-value items; use transaction value method with purchase invoices
• Classify as diode despite oscillator function per semiconductor definitions