DARLINGTON Phototransistor Dual Element
High current gain darlington connected phototransistor pair providing 10,000+ gain for low light level detection in smoke detectors and medical instruments. Falls under HTS 8541.49.70 as photosensitive transistor configuration.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If current-limiting resistor integrated
Becomes complete electrical diode/resistor assembly rather than pure semiconductor.
If mounted on control board with other components
Part of complete control panel or board assembly.
If part of complete smoke detector unit
Imported as component of finished filtering/purifying appliance.
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Import Tips & Compliance
• Specify darlington configuration in documentation; still classifies as phototransistor not two separate devices
• Include smoke detector UL certification if applicable for end-use verification
• Avoid GRI 3(a) set classification; functions as single photosensitive transistor unit
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