Two adapter programmes are quoted for the same output. In the first, the connector is described in a drawing note – “5.5 x 2.1 mm, centre positive” – and the sample arrives matching the note. In the second, the connector is agreed by part number, the polarity is confirmed on a physical sample with a meter, and both are written into the purchase order. The unit prices differ by a few cents. The difference in expected returns differs by an order of magnitude, because the second programme has eliminated the failure mode that dominates this category.
This guide is part of our Charger Factory & Production. Read the full topic guide for the decisions that come before and after this step.
AC DC adapter manufacturer: the four decisions that decide the programme
Four decisions carry most of the risk in an adapter programme.
The output and connector specification, the alignment between the adapter documentation and the end product’s compliance file, the label and importer details for each market, and whether the product is built on an existing platform or a new design. Each is cheap to settle before the order and expensive to correct afterwards.
The reason these four matter more than the wattage is that an adapter is usually a component of someone else’s product. It powers equipment that runs continuously, in a system whose compliance file may already exist. A change to the connector, the polarity or the marking is therefore not a cosmetic change to the adapter alone; it is a change to the documentation of everything downstream.
Decision 1: output voltage, current, connector and polarity
Specify all four in writing and confirm all four on a physical sample with a meter.
Voltage and current set compatibility; the connector sets the fit; the polarity decides whether the equipment works or is damaged. The specification should also state the cable length and the strain-relief requirement, because both affect how the adapter survives handling in the field. Then verify the production check: ask how polarity is inspected, whether the check is recorded per unit, and what the pass criteria are. An inspection that relies on the operator’s eye at the packing station is not a control.
| Specification item | Where it is stated | How it is verified |
|---|---|---|
| Output voltage and current | Purchase order and label | Functional test on every unit |
| Connector type | Purchase order and approved sample | Physical sample check |
| Polarity | Purchase order and drawing | Meter check on the sample and in production |
| Cable length and strain relief | Specification drawing | Sample measurement and pull check |
| Marking and model designation | Label artwork | Comparison with the certification file |
Decision 2: alignment with the end product’s compliance file
Adapters are frequently assessed as part of the equipment they power.
Where that is the case, the adapter’s model number, ratings and marking have to align with the end product’s technical file – and the device manufacturer may need specific information from the adapter supplier. Where the adapter is also sold separately, it needs its own documentation for the market. Ask the supplier which reports exist for the platform, whether they name the model, and what the device manufacturer needs. This alignment is the cheapest check in the programme and one of the most common causes of a customs or retail query when it is missed.
Decision 3: labelling, language and importer details
The label carries more information on an adapter than on a phone charger.
Input and output ratings, model designation, manufacturer identification and market marks all appear on a small surface, and the required content differs by destination. Confirm the label layout for each market, freeze the text before the print plates are produced, and make sure the importer details reflect the entity placing the product on that market. A reprint before the order is cheap; a reprint after the cartons are printed is not.
Decision 4: platform or new design
The commercial route determines the MOQ and the schedule.
On an existing platform, a branded adapter can open at 200 pieces per model with the label, colour and packaging applied, and the safety-critical design and reports already exist. A new enclosure or a new output configuration carries tooling and sample loops, which sets a higher minimum and a longer calendar. Ask the quotation to state which route it represents and to separate tooling from the unit price, because a low MOQ quoted on a new design usually means the tooling is recovered elsewhere.
Verification on the sample – and why photographs are not enough
Measure the sample, record the measurements, and keep the unit.
Check the output under load, the connector fit, the polarity, the cable length and the marking against the certification file. Photographs support the record but do not replace the physical reference, because a connector that looks correct in a picture can be the wrong diameter by a fraction that matters. The retained sample is what decides a dispute about conformity later, and it is what the purchase order should reference.
Verification in production
Ask how the output and the polarity are checked on every unit, and ask for the record.
Functional test should cover output voltage, current and protection functions on 100% of units, followed by aging under load. Outgoing inspection covers appearance, label and packing. Then ask to trace a carton back to its batch and component lots, and ask how a rejected lot is dispositioned. The production checks are what turn a correct sample into a correct shipment.
Commercial terms to fix before ordering
State the output, connector, polarity, cable, markets, quantity and Incoterm in one document, and ask the supplier to restate them in the quotation.
Where any of those is missing, the price is an assumption. Ask also for the warranty and spares terms and for the change-notification process, since an adapter that powers equipment continuously is exposed to a different failure profile than a consumer charger.
FAQ
“The drawing already states the connector, so the sample must be right.”
A drawing states intent; the sample proves execution. Connector diameters, barrel lengths and polarity are the details most often misread between drawing and tooling, and a meter check on the physical sample takes a minute. Treat the drawing as the specification and the sample as the evidence. A drawing states intent and the sample proves execution, and connector diameters and polarity are the details most often misread.
“Our equipment is certified, so the adapter does not need documentation.”
If the adapter is assessed as part of the equipment, its model number, ratings and marking have to align with that technical file, and the supplier still needs to provide the relevant reports and declarations. Where the adapter is sold separately, it needs its own documentation for the market. Where the adapter is assessed as part of the equipment its ratings and marking have to align with that file, and where it is sold separately it needs its own documentation.
“A new output configuration should be cheaper than a new enclosure.”
It may be, when it stays inside the tested envelope and only the documentation changes. If the change moves the internal layout, the thermal behaviour or the input stage, the review or retest can cost more than expected, and the platform route may be cheaper overall. Where the change stays inside the tested envelope only the documentation moves, while a change to the layout or the input stage can cost more than a new enclosure.
Next step
Send the output specification, connector, polarity, markets and quantity to Wecent Group through the contact page. The reply states the platform, the tooling position, the MOQ, the certification scope and the sample timing, so the quotation can be compared line by line. Related reading: OEM/ODM manufacturing, quality control and wholesale chargers. External references: IEC standards, EU CE marking, FCC equipment authorisation, EU RoHS directive, ECHA REACH and ISO 9001.