Choosing a PCBA Manufacturer in China
Most of the electronics supply chain sits in China, and for a buyer the interesting question is not whether to use it but how to choose inside it. The difference between a good and a bad outcome on an offshore programme rarely comes down to equipment. It comes down to whether the supplier documents what it does, states what it cannot do, and gives the buyer enough structure to compare one supplier against another.
Why PCBA production concentrated in China
The reason is structural rather than a matter of labour cost, and the distinction matters because it tells a buyer which advantages survive a rising cost base and which do not.
- Supply chain depth in one place. Fabrication, component distribution, stencil makers, test fixture builders and assembly houses sit within a short radius of each other. A shortage can be worked around locally in days rather than sourced internationally in weeks.
- Component availability. The largest distributors hold stock in the region, and a wide range of parts can be bought at short notice rather than against a long lead time.
- Process range and density. Fine-pitch placement, mixed-technology assembly with heavy through-hole content, conformal coating, box build and functional test are all available at a scale that is hard to assemble in a single location elsewhere.
- Engineering labour. Process engineers, test engineers and DFM reviewers are available in the numbers a manufacturing operation needs.
What this means in practice is that the competitiveness of Chinese manufacturing is mostly about coordination: the number of suppliers a buyer has to manage, and the number of handovers a schedule has to survive. That is also the reason a turnkey supplier is worth more than a cheap one. The turnkey PCBA page explains what the handover-free model covers.
What to verify before awarding a programme
The list below is deliberately concrete. Each item can be checked rather than taken on trust, and a supplier who cannot produce the evidence for an item is telling you something useful about how the rest of the relationship will run.
| What to check | What good evidence looks like |
|---|---|
| Manufacturing scope | Which processes are in-house and which are subcontracted, stated explicitly rather than implied by the word turnkey |
| Equipment list | Specific placement platforms and line count, printer and inspection equipment, DIP line count and soldering method |
| Quality certifications | Current certificates with the certification body named, and a clear statement of what each one covers |
| Workmanship standard | The acceptance class the factory works to by default, and whether a higher class can be held on request |
| Inspection capability | Whether SPI, AOI and X-ray are in line or sampling, and how the results are recorded |
| Traceability | Whether a finished assembly can be tied back to component lots, reflow profile and inspection results months later |
| Component sourcing channel | Authorized or franchised distribution, with incoming inspection and anti-counterfeit verification described |
| Quotation structure | Component, fabrication, assembly, test and one-time items as separate lines, with quantity band and lead time stated |
| Documentation language | Whether technical documents and DFM findings are issued in English as standard rather than on request |
On certifications: what they do and do not tell you
A quality system certificate says that a documented process exists for the scope it names. It does not say which processes at the site are inside that scope, and it does not replace the equipment and inspection answers above. The useful questions are which certification body issued it, what the scope statement covers, and whether subcontracted processes sit outside it. A supplier that answers those three questions directly is usually the one whose certificate means something.
The questions that separate suppliers
Price and lead time can be answered by anyone. These questions are harder, and the way they are answered is more informative than the answers themselves.
- What is not made in-house? A supplier with a clear boundary is easier to plan with than one that claims everything.
- What happens when a part is on allocation? The answer should describe how long-lead and single-source parts are identified before the purchase order, not after a shortage.
- What exactly does the DFM review cover? Panel utilisation, footprints, placement feasibility, component lifecycle and stack-up are specific. Generic design review is not.
- What does the quotation exclude? Test fixtures, programming jigs, coating and shipping are the items most often assumed rather than stated.
- What is the change process after material is ordered? The cost of a change at each stage, from free before material release to a new bare board after fabrication, should be answerable in advance.
- How is progress reported? Tracked milestones such as material arrival, board readiness, SMT, DIP and test are useful. A single percentage is not.
- Who is the contact, and in which language? A named contact who answers technical questions directly is worth more than a shared inbox.
- What records come with the shipment? Inspection records, material declarations and lot traceability should be standard rather than extra.
Where offshore programmes go wrong
- Comparing headline prices. A lower total that excludes test coverage or assumes a different surface finish is not lower. Compare line by line, as set out on the PCBA cost page.
- Sending an incomplete file set and accepting a verbal scope. An assumption made to fill a gap is where the difference between the quotation and the invoice is created.
- Choosing on unit price at the wrong quantity. A price quoted at 100 units says little about the price at 5,000. Ask for the band that matches the intended production volume.
- Leaving the acceptance class open. Class 2 and Class 3 differ in inspection and in records, and the standard is fixed at quotation rather than on the line.
- Managing the supplier through a trading company with no process visibility. It adds a margin and a layer, and it removes the direct access to engineering that makes DFM findings useful.
- No written plan for component risk. A schedule that assumes every part will be available is not a schedule.
Communication, documentation and the time difference
The time difference is usually raised as the main concern and is usually the smallest one. What actually causes friction is unwritten decisions. A programme that runs on written DFM findings, a written material plan, tracked milestones and lot records can be reviewed at any hour; one that runs on calls and good intentions cannot be checked at all. Prefer a supplier who issues findings and changes in writing by default, and treat the responsiveness of the written channel during the quotation stage as a preview of how the production stage will run.
Payment, trade terms and shipping
Payment terms and trade terms should be on the quotation rather than agreed verbally later. A deposit against material is normal on a first order, because components are purchased against it, with the balance against shipping documents; on a running programme the terms are reviewed rather than carried forward automatically. On shipping, the Incoterm determines who owns the freight, insurance and customs clearance, and it should be stated explicitly because it materially changes the landed cost of a board. Where a buyer is comparing suppliers on price, the trade term has to match for the comparison to mean anything.
When offshore manufacturing is the wrong answer
Being direct about this saves both sides time. A programme that needs a hundred units a month of a simple board, revised weekly, is usually better served locally, because the engineering interaction dominates the cost. A product under export control in its final market, or with a mechanical design that requires the board to be fitted into an enclosure on site, can also be a poor fit. What works well offshore is a design that is stable enough to freeze, with a defined file set and a volume that justifies setting up a production process.
How we work with overseas buyers
Kilandu is a single site in Baoan District, Shenzhen, running four Yamaha high-speed SMT lines and three automatic DIP lines with a combined capacity of about 150 million component placements per month, with around 150 staff including more than 20 engineers. PCB fabrication, component sourcing, SMT, DIP, conformal coating, box build and functional test are carried out by the same organisation under IATF 16949:2016, ISO 9001:2015, ISO 13485:2016 and ISO 14001:2015 certified systems, with workmanship to IPC-A-610 Class 2 or Class 3 and RoHS and REACH compliant materials. The Shenzhen factory page describes the site, the SMT assembly page covers the placement and soldering process, and the quality assurance page explains how records are held.
To start, send the file set to Gelant.lei@kilandu.com: Gerber files including drill data and board outline, a BOM with manufacturer part numbers, an assembly drawing and the expected quantity. Typical turnkey lead time is 2 to 5 weeks from a complete file set, with no fixed minimum order quantity. The quotation requirements page lists what produces an accurate figure, and the MOQ and lead time page explains what sets those two numbers.
How do I verify a PCBA manufacturer in China?
Check what is made in-house and what is subcontracted, the specific placement platforms and line count, current certificates with the certification body named and the scope they cover, the workmanship class worked to by default, whether SPI, AOI and X-ray run in line, how traceability is recorded, and how the quotation is structured. Each item can be evidenced rather than taken on trust.
What certifications should a PCBA factory hold?
What matters is which certification body issued the certificate, what the scope statement covers, and whether subcontracted processes sit outside it. A quality management certificate says that a documented process exists for the named scope; it does not replace questions about equipment, inspection capability or traceability.
What are the main risks of offshore PCBA manufacturing?
Comparing headline prices rather than line-by-line quotations, accepting a verbal scope against an incomplete file set, choosing on a unit price quoted at the wrong quantity, leaving the acceptance class open, managing the supplier through a trading company with no process visibility, and having no written plan for component risk.
Is China always the right choice for PCBA production?
No. A programme that needs a small quantity of a simple board revised frequently is usually better served locally, because the engineering interaction dominates the cost. What works well offshore is a design stable enough to freeze, with a defined file set and a volume that justifies setting up a production process.