TLP521 Optocoupler
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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If configured primarily as a photodiode without transistor output
Photodiodes without integrated transistor output classified separately from optical coupled isolators with complete input-output coupling
If when imported as processor-integrated hybrid circuit
Devices integrated into microprocessor circuits or hybrid ICs fall under integrated circuits rather than discrete photosensitive semiconductors
If packaged as complete connection device for apparatus
Apparatus connectors with integrated isolation may classify under electrical connections rather than semiconductor devices
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Import Tips & Compliance
• 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
Related Products under HTS 8541.49.80.00
PC817 Photocoupler
The PC817 series optical isolator features an infrared LED optically coupled to a phototransistor in a 4-pin DIP package, offering 5kV isolation voltage. Classified under HTS 8541.49.80.00 for its role as an optical coupled isolator in telecommunication equipment and AC input detection circuits. Provides high reliability signal transmission between high and low voltage circuits.
TLP181GB High-Speed Optocoupler
TLP181GB is a high-speed optical coupled isolator with infrared LED and phototransistor, featuring 3.75kV isolation for 10Mbps data transmission. Falls under HTS 8541.49.80.00 as it provides optical signal coupling for isolated I/O interfaces in digital circuits. Used in PLCs and servo amplifiers requiring fast switching isolation.
SFH618A-2 Phototransistor Optocoupler
SFH618A-2 optical isolator combines AlGaAs infrared emitter with phototransistor in SMD package, providing 5.3kV isolation. Classified HTS 8541.49.80.00 for optical coupling in SMPS feedback circuits and microprocessor interfaces. High CTR stability makes it ideal for precise current sensing applications.
H11A1 AC Input Optocoupler
H11A1 features bidirectional phototransistor output for AC input detection, optically coupled to infrared LED with 5kV isolation. HTS 8541.49.80.00 classification for optical isolation in zero-crossing detection and solid-state relays. Designed for noisy industrial environments requiring reliable AC signal isolation.
4N25 General Purpose Optocoupler
4N25 is a versatile optical isolator with GaAs infrared LED coupled to phototransistor in 6-pin DIP, offering 2.5kV isolation. Falls under HTS 8541.49.80.00 for general purpose interface isolation in computers, printers, and instrumentation. Base-emitter pin enables high-speed switching applications.
TLP2362 High-Speed Logic Gate Optocoupler
TLP2362 integrates infrared LED with high-speed logic gate output for 15Mbps isolated data transmission, 3.75kV isolation. HTS 8541.49.80.00 as optical coupled isolator despite logic function due to discrete photosensitive semiconductor construction. Used in isolated bus interfaces and digital I/O cards.