Sourcing optocouplers from China
The supplied tariff lines for heading 8541 all carry 0% UK duty for goods from China, including the other photosensitive semiconductor line relevant to optocouplers. For finished equipment, obtain component evidence to support restricted-substance compliance. Cambridge China Bridge sources optocouplers.
Optocoupler duty and classification
Read from the UK Trade Tariff on 29 September 2026, every supplied line under heading 8541 carried 0% duty for goods from China. The facts record no anti-dumping or countervailing duty, suspensions or attached import controls. Import VAT at 20% still applies.
Heading 8541 covers semiconductor devices, including photosensitive devices. The table presents optocoupler variants against the same other photosensitive semiconductor line, 8541 49 00 00. Treat this as a classification starting point: send the complete datasheet and internal circuit diagram to your customs broker and confirm the commodity code.
Keep loose optocouplers distinct from assembled boards and complete equipment when checking classification. For the wider semiconductor heading, see power MOSFETs. The import duty and VAT guide explains the tax calculation.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Phototransistor-output optocouplers | 8541 49 00 00 | 0% | None |
Specify the optical barrier and output
Name the manufacturer, complete part designation, output type, channel arrangement, package, pinout and packing format. For transistor outputs, specify the current transfer ratio band and its test current, voltage and temperature. For switching applications, specify propagation delay, rise and fall behaviour and output leakage. Agree substitutions in writing before production.
Specify working insulation needs separately from the isolation test rating. Ask for model-specific safety approval evidence, package dimensions and test conditions, then have your equipment designer assess them against the circuit. Match creepage, clearance and soldering conditions to the board design.
Government guidance says manufacturers must determine component compliance before incorporation into a final assembly and obtain sufficient supplier information for restricted-substance compliance. Request material declarations and supporting reports matched to the exact part. Use testing and certification to define the evidence you need.
Worked duty example
Illustrative example, not a quote: Illustrative order: 5,000 phototransistor-output optocouplers; FOB value and freight are illustrative, not a quotation. under 8541 49 00 00, invoiced at £1,500 free on board, with £600 of freight and insurance to the UK. The customs value is £2,100. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £2,100, so it is £420. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.
Inspection checklist
Identity: match package markings, part suffixes, lot records and packing labels to the purchase specification; investigate mixed lots or inconsistent markings.
Electrical behaviour: sample current transfer ratio at the agreed conditions, input forward voltage, output leakage and switching behaviour; compare results with the approved sample.
Insulation: match approval documents to the exact model and package; arrange isolation testing using the agreed method and acceptance criteria.
Arrival condition: check bent leads, package cracks, contamination, reel orientation and protective packing before assembly. Record findings using the quality inspection guide.
What goes wrong
An apparently equivalent part can have a different transfer ratio band, pinout or switching response. A circuit that works with a sample may fail with a substituted production lot. Keep the approved part designation and test conditions in the purchase specification, and require approval before any change.
An isolation test figure alone does not establish suitability for continuous working voltage. Unmatched approval documents, remarked parts and weak lot records also make acceptance difficult. Resolve discrepancies before fitting the parts to boards, and retain samples and supplier records.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification.
Frequently asked questions
What is the UK import duty on optocouplers from China?
The supplied tariff facts show 0% for 8541 49 00 00, with no anti-dumping or countervailing duty. Confirm classification for the exact device. Import VAT at 20% still applies.
Can I replace an optocoupler with an equivalent part?
Compare output type, pinout, transfer ratio band, switching response and insulation evidence. Test the proposed replacement in your circuit and approve the exact designation before supply.
What documents should I request from an optocoupler factory?
Request the exact datasheet, lot traceability, material declarations, supporting substance reports and model-specific safety approval evidence where specified by your equipment designer.
How do I check an optocoupler shipment?
Match markings and lot records, inspect packing and leads, and sample electrical behaviour against agreed conditions. Match insulation evidence to the exact model and package.