Product-specific sourcing · China
PCB Assembly & Prototype PCBA Sourcing in China
Compare China prototype and small-batch PCBA suppliers by Gerber package, BOM completeness, Pick & Place, assembly quantity, turnkey or consigned sourcing, substitution rules, SMT/THT process, programming, test scope, lead time and NRE.
Buyer context
Make the technical and commercial basis comparable first.
Prototype and small-batch PCBA quotations often look comparable until Gerber completeness, BOM quality, Pick & Place data, sourcing model, substitution rules, test scope and lead times are written down. Sephalis helps buyers make those fields explicit so supplier quotations stay comparable, and keeps supplier statements separate from engineering validation or compliance approval.
What buyers usually need to compare
Use these fields to keep quotations tied to the same technical, production and packaging assumptions.
✓ Board revision
✓ Controlled Gerber / fabrication package completeness
✓ BOM revision and completeness (MPN, quantity, reference designators)
✓ Pick & Place / centroid file availability
✓ Assembly quantity (prototype pcs, small-batch pcs, production pcs)
✓ Component sourcing model (turnkey, partial, or consigned)
✓ Substitution / alternate-part policy and who approves changes
✓ Assembly process (SMT, THT, or mixed)
✓ Programming requirement and whether fixtures or NRE are separate
✓ Test scope (AOI, X-ray, ICT, functional, and what is included in unit price)
✓ Prototype / sample lead time versus production lead time
✓ Quotation fields: NRE, setup, fixtures, expedited parts, exclusions and MOQ
Evidence worth collecting before the next decision
Sephalis keeps supplier statements, technical evidence and unresolved questions separate so the buyer can see what is known and what still needs engineering or specialist review.
✓ Controlled Gerber package with board revision
✓ BOM revision with manufacturer part numbers
✓ Pick & Place / centroid file or assembly drawing
✓ Written sourcing model (turnkey, partial, or consigned)
✓ Written substitution rules where alternatives may be used
✓ Test specification and which checks are included in the quotation
✓ Separate written prototype and production lead times
✓ Quotation showing NRE, setup, fixtures, exclusions and unit-price basis
✓ Supplier-provided first-article or inspection notes where offered (not Sephalis engineering sign-off)
Commercial comparison
Separate one-time development cost from recurring unit cost.
For electronics, tooling, NRE, programming, test fixtures, artwork and prototype charges may sit outside the production unit price. A useful comparison keeps those charges visible together with MOQ, lead time, packaging and FOB terms.
Technical boundary
Supplier documents are evidence, not automatic approval.
Sephalis can collect specifications, quotations, supplier documents and samples. Formal electrical safety, radio, battery transport, engineering validation, product compliance and market-access decisions remain separate questions for the relevant specialists and authorities.
Common buyer questions
Short answers below describe the sourcing workflow rather than engineering or regulatory approval.
Should prototype and production PCBA prices be compared directly?
No. Separate NRE, setup, expedited component sourcing, fixtures and low-volume assembly costs from recurring production unit pricing before comparing suppliers.
Can suppliers be compared without a complete BOM and Gerber package?
A rough estimate may be possible, but a comparable PCBA quotation normally needs a controlled Gerber package, a complete BOM with manufacturer part numbers, and clear assumptions on quantity and sourcing model. Sephalis can help structure those RFQ fields; it does not invent missing engineering data.
Why must turnkey, partial and consigned sourcing be stated in the RFQ?
Who buys the components changes price, lead time and shortage risk. Asking each supplier to quote under the same sourcing model keeps the comparison valid.
Does Sephalis manufacture PCBA or guarantee DFM, yield, IPC class or delivery?
No. Sephalis is a buyer-side sourcing and supplier-research service. It helps compare PCBA manufacturers and collect files, quotations, lead times and supplier documents. Manufacturing capability, DFM conclusions, yield, IPC claims and delivery commitments remain with the supplier, and formal engineering validation or compliance approval stays with the relevant specialists.
How should AOI, X-ray, ICT and functional test be written into the RFQ?
List the required test methods and ask which ones are included in the unit price versus charged as NRE or fixtures. Treat supplier test statements as evidence to collect and compare, not as automatic product approval or a Sephalis guarantee.
When should I use pcb-assembly vs fpc-ffc, lcd-tft-modules or heatsinks?
Use this page for bare-board fabrication and PCBA from Gerber/BOM. For bare FPC / FFC flex circuits and flat-cable jumpers (not rigid FR-4 PCBA), use /electronics-sourcing-china/fpc-ffc. For an embedded display module (LCD/TFT panel with driver board or FPC interface as a module RFQ), use /electronics-sourcing-china/lcd-tft-modules. For a purchased discrete metal heatsink (extruded/skived/bonded-fin/CNC), use /electronics-sourcing-china/heatsinks; heatsink attach or assembly onto the board stays in pcb-assembly scope notes so suppliers quote the same product scope.
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