Sourcing photodiodes from China

Photodiode duty and classification

Read from the UK Trade Tariff on 29 September 2026, photosensitive semiconductor devices under 8541 49 00 00 carried 0% duty on goods from China. The supplied tariff record lists no anti-dumping or countervailing duty, suspensions or attached import controls for this line. Import VAT at 20% still applies.

Heading 8541 covers semiconductor devices and related parts. This guide concerns photodiodes bought as components, rather than photovoltaic cells or complete optical instruments. The table shows photodiode variants sharing the same commodity line. Confirm the commodity code against the actual datasheet and supplied form. For related devices within the wider heading, see optocouplers.

Specify optical response and component materials

Specify semiconductor material, spectral response, active area, responsivity, dark current, junction capacitance and response time. State the wavelength, illumination, reverse bias and temperature for each acceptance test. Agree package dimensions, window material, viewing angle, pin polarity and packing orientation. Approve a sample in your own optical arrangement before ordering production stock.

Official Great Britain guidance says component parts sold business to business are outside the hazardous-substance regulations' scope, while covered finished assemblies must comply, including their components. Request material declarations and supporting test information for the exact part, including lead finish, bonding materials and encapsulant, to support your finished-product assessment.

Official waste guidance says components supplied to a business for building a finished product are not electrical and electronic equipment products for waste-equipment purposes. Assess a complete detector separately rather than applying the component treatment to it.

Worked duty example

Illustrative example, not a quote: Illustrative order only: 5,000 photodiodes for a sensor production batch 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 part markings, manufacturer, lot references and packing labels to the approved datasheet and purchase order; retain samples from each supplied lot.

Optical performance: measure photocurrent under the agreed light source and geometry, then check dark current with the detector shielded from light at the agreed bias and temperature.

Electrical and mechanical checks: verify polarity, capacitance and response time against the agreed limits; inspect windows, leads and package dimensions for damage or contamination.

Packing: check protective packaging, reel orientation and lot separation on arrival; compare the shipment with retained samples. Use the inspection guide to agree the inspection stages.

What goes wrong

A matching package does not establish matching optical performance. A substituted detector can respond differently to your light source, while elevated dark current can obscure weak signals. Different test temperatures or illumination geometry can make supplier results look acceptable without reproducing performance in your circuit.

Scratched windows, contaminated optical surfaces, bent leads and mixed lots complicate assembly and fault tracing. Require written approval before substitutions, retain batch test records and quarantine stock that fails the agreed arrival checks.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification.