Sourcing Zener diodes from China
Zener diodes from China carry a flat 0% UK import duty under 8541 10 00 00. In Great Britain, components sold business to business are outside the hazardous-substance regulations, but a final assembly placed on the market must comply. Specify Zener voltage at the agreed test current. Cambridge China Bridge sources Zener diodes.
0% duty on Zener diodes
Read from the UK Trade Tariff on 29 September 2026, Zener diodes under 8541 10 00 00 carried 0% duty on goods from China. The supplied tariff extract lists no anti-dumping or countervailing duty, suspension or attached import control for this line. Import VAT at 20% still applies.
Heading 8541 covers semiconductor devices and mounted piezo-electric crystals. Zener diodes belong to the line for diodes other than photosensitive or light-emitting diodes. The table shows different Zener packages sharing the same commodity code, rather than separate tariff subdivisions.
Confirm the commodity code using the datasheet and the goods as supplied. For the wider diode category, see rectifier diodes.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Axial leaded Zener diodes | 8541 10 00 00 | 0% | None |
Specify Zener voltage and test conditions
Write the manufacturer, exact part number, package, nominal Zener voltage, voltage tolerance and test current into the purchase specification. Also agree reverse leakage at its stated voltage, dynamic impedance, temperature coefficient and power dissipation under the intended mounting conditions. Approve substitutions explicitly rather than accepting a matching package alone.
Great Britain’s hazardous-substance guidance excludes component parts sold business to business from its scope. When incorporated into a final assembly placed on the market, the assembly, including its components, must comply. Ask for material declarations and supporting reports matched to the ordered part and lead finish, so the assembly maker can assess the evidence.
Worked duty example
Illustrative example, not a quote: Illustrative order: 5,000 Zener diodes for circuit assembly under 8541 10 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 reel or bag labels, manufacturer details, part markings and batch references to the order and approved sample. Keep different production lots identifiable.
Electrical performance: sample each lot for Zener voltage at the agreed test current, reverse leakage and dynamic impedance. Record test temperature and compare results with the agreed datasheet limits.
Package and polarity: check dimensions, cathode marking, lead condition, cracked glass or moulding damage, and solderability against the approved sample. For board assembly equipment, see our guide to sourcing reflow soldering ovens. For metal-core boards, see our metal-core PCB sourcing guide.
Packing: check tape orientation, pocket fit, loose components and protection against static discharge. Repeat identity and damage checks on arrival; agree the stages through quality inspection.
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What goes wrong
A diode can match the nominal voltage yet behave differently at the circuit’s operating current. Testing at a different current or temperature can hide a mismatch. An unsuitable power rating or mounting arrangement can cause overheating, while excessive leakage can upset a reference circuit.
Mixed voltage grades, substituted parts and misleading markings can escape a visual check. Reversed tape orientation causes assembly errors, and damaged or oxidised leads can cause soldering failures. Compare bulk samples with the approved part electrically as well as visually before accepting the shipment.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.
Frequently asked questions
What is the UK import duty on Zener diodes from China?
The supplied tariff reading gives 0% under 8541 10 00 00, with no anti-dumping or countervailing duty, suspension or attached import control. Import VAT at 20% still applies.
Are business-to-business Zener diodes covered by hazardous-substance rules?
Great Britain’s guidance excludes component parts sold business to business. A final assembly placed on the market must comply, including its components. Obtain part-specific material evidence.
What should I specify when buying Zener diodes?
Specify the exact part, package, Zener voltage and tolerance at the stated test current, leakage, impedance, temperature behaviour and power rating. Agree the mounting and packing conditions.
How do I check a shipment of Zener diodes?
Keep lots separate, match markings and labels to the order, and test bulk samples at the agreed current and temperature. Check polarity, package damage, lead condition and tape orientation.