TLP521 Optocoupler from China

The TLP521 is a photosensitive semiconductor optocoupler consisting of a gallium arsenide infrared LED optically coupled to a phototransistor, providing electrical isolation up to 2.5kV. It falls under HTS 8541.49.80.00 as an optical coupled isolator used in power supplies and motor drives to transmit signals while preventing high voltage feedback. This device ensures reliable galvanic isolation in industrial control circuits.

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

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Import Tips

• Verify isolation voltage rating (e.g

• 2.5kV) and CTR (current transfer ratio) specifications match datasheet to confirm classification as optical coupled isolator under 8541.49.80

• Include manufacturer datasheets showing LED-phototransistor optical coupling in commercial invoice; declare as 'photosensitive semiconductor device' not general diode

• Avoid misclassification as LED assemblies by confirming single-channel isolator function; check for RoHS compliance documentation required for electronics imports