The factory’s location tells you less about your risk than its component change policy. Most GaN charger surprises do not come from a bad production line; they come from a substitution made quietly when a controller or a power switch becomes scarce, and discovered months later in the field. Vet the change-control process as carefully as the equipment, and most of the sourcing risk disappears before the order is placed.
This guide is part of our GaN Charger Technology. Read the full topic guide for the decisions that come before and after this step.
Sourcing GaN chargers in China: the five verification steps
Five steps cover the risk that a factory tour does not.
Entity and site verification, the component change-control policy, the certification reports that name the model, the capacity answer calculated with test time included, and a pilot order run at rate. Each step produces a document or a measurement, so the decision rests on evidence rather than impression.
The order in which they are run matters because the first two are cheap and decisive: a supplier that cannot match its legal entity to the site, or cannot describe who approves a component change, is a supplier whose other answers will not be verifiable either. The pilot order sits last because it consumes time and money, and it should only be placed once the documentary steps have passed.
Step 1: verify the entity, the site and the product scope
Confirm the legal entity, the factory address and which products are built there.
Ask whether the GaN products are assembled on the site you will visit, and whether the power stage is produced in-house or purchased as a module. A supplier that assembles purchased modules is a legitimate business, but it changes where the technical responsibility sits and which documents it can produce. The verification is quick: a licence, an address and a consistent answer about the product.
Step 2: the component change-control policy
Ask which components are treated as safety-critical, who approves an alternate, what testing it requires and how the customer is notified.
On a GaN design the controller and the power switch are the parts most exposed to allocation, and both affect the thermal and electromagnetic behaviour of the product. A written policy with a notification step protects the approved sample and the certification file. A supplier who answers that an equivalent part will always be found has described an intention rather than a process, and the first evidence of a change will be a complaint rather than a note.
| Step | Evidence that passes | Failure pattern |
|---|---|---|
| Entity and site | Licence, address and product scope agree | Address differs from the site that will build the order |
| Change control | Written policy with approval and notification | Verbal assurance that equivalents exist |
| Certification | Report naming the model and the markets | Certificate covering a sibling product |
| Capacity | Daily output including test time | Output quoted without the test cycle |
| Pilot | Yield and defect categories reported | Pilot described as a sample shipment |
Step 3: certification reports that name the model
Ask for the report files, not a summary, and check the model number against the quotation.
Certification is model and market specific. Wecent Group prepares certification groundwork for CE, FCC, RoHS, PSE and KC and confirms the current status per model. Check the issuing laboratory, the standard cited and the market covered; where a document is undated or refers to a different model, request the correct version before the order rather than after a customs query. Treat any market without a report as uncertified and plan the schedule accordingly.
Step 4: capacity calculated with test time included
Ask for the daily output with the functional test applied to every unit.
Assembly can be parallelised across benches; the test station has a fixed cycle time per unit and usually sets the line rate. A capacity figure quoted without the test cycle is optimistic, and the gap appears as a schedule slip rather than as a quality problem. Ask also which milestone converts an enquiry into planned production, and how many active programmes the line is supporting.
Step 5: the pilot order
Run a pilot on the production line with the approved sample and require a report.
The report should state the quantity, the yield, the defect categories and the corrective actions taken. For a GaN product, the pilot is also the moment to confirm that the assembly fixtures hold the thermal interface and the magnetics at rate, because a process that works on ten units can drift over a thousand. Where a supplier cannot produce a pilot report, the first container becomes the pilot.
Can we skip the pilot order to save time?
The pilot is the cheapest place to discover that the fixtures cannot hold the design at rate. Skipping it moves that discovery to the first container, where the cost includes the whole batch, the freight and the schedule. For a GaN product the pilot also confirms the thermal interface and the magnetics positioning under production conditions. Treat it as the first test of the process rather than as an overhead.
FAQ
“We have used this factory for years without a problem.”
A long relationship shows the supplier has been stable, not that the specific platform being quoted is characterised. Run the same five steps against this product, because the risk lives in the component list and the certification file, not in the relationship. Run the same five steps against this specific product, because the risk lives in the component list and the certification file rather than in the relationship.
“The price includes a three-year warranty, so quality is covered.”
A warranty transfers some cost but not the operational disruption of a field failure, and it says nothing about whether a carton can be traced to its batch. Ask for the change-control policy and the traceability demonstration, which are the controls that prevent the failure in the first place. Ask for the change-control policy and the traceability demonstration, which are the controls that prevent the failure in the first place.
What to keep on file after sourcing
Keep the signed specification, the approved sample, the certification reports, the change-control policy and the pilot report together with the purchase order.
That pack turns a repeat order into a repeat rather than a renegotiation, and it is what allows a claim or a compliance query to be answered by reference instead of reconstruction. Review it once a season, because a component reaching end of life is the event most likely to make the documents out of date.
Next step
Send the specification, markets and expected volume to Wecent Group through the contact page. The reply provides the platform, the certification position, the capacity answer with test time included and the pilot terms, so the five steps can be completed before the order. Related reading: our charger factory, OEM/ODM manufacturing and quality control. External references: USB-IF documentation, ISO 9001, IEC standards, EU CE marking, FCC equipment authorisation and GS1 standards.