Ambient Light Sensor Transistor ALS-PT19 from China
A photosensitive transistor designed to measure ambient visible light levels for automatic backlight control in smartphones and displays. It features a daylight-visible spectral response mimicking human eye sensitivity, operating as a light-dependent transistor. Falls under 8541.49.70.80 as a discrete photosensitive semiconductor transistor.
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%Universal product exemption (U.S. note 52(b))
Import Tips
• Provide spectral response curves showing visible light sensitivity (400-700nm) to distinguish from IR-only devices
• Declare as discrete component, not IC, with leadframe photos confirming single transistor die construction
• Watch for reclassification as display parts (8531.90) if marketed specifically for LCD backlight systems