What Determines a PCB Assembly Quote in China?
The manufacturing files, component ownership, quantity, revisions, programming, testing, delivery, and timing information a PCBA supplier needs before issuing an accurate quotation.
Engineering review by Huitai Engineering Team
Quick Answer
A PCBA manufacturer needs controlled files and commercial requirements that define PCB fabrication, component sourcing, assembly, programming, inspection, testing, packaging, and delivery. The core inputs are Gerber, BOM, CPL or pick-and-place data, Assembly Drawing, PCB specification, Quantity, Revision status, and any Firmware / programming, Testing requirements, component-ownership, delivery, or requested-timing details.
The goal is not to make every file perfect before the first conversation. The goal is to identify what is confirmed, what is missing, and which assumptions prevent an accurate quotation. Use the PCBA Quote File Checklist for an upload-ready review.
Information That Determines an Accurate PCBA Quote
| RFQ input | What it defines | Typical open question |
|---|---|---|
| Gerber and drill data | Bare PCB layers, outline, copper, mask, silkscreen, and drill scope | Are fabrication notes and the board outline complete? |
| BOM | MPNs, designators, quantities, fitted parts, DNP/DNI, and sourcing ownership | Are suffixes, alternatives, and no-substitute items controlled? |
| CPL / Pick-and-Place | SMT position, side, rotation, and designator mapping | Does it match the BOM and assembly revision? |
| Assembly Drawing | Polarity, connectors, wires, mechanical notes, and special operations | Are manual or orientation requirements visible? |
| PCB specification | Material, thickness, copper, finish, color, stack-up, panel, impedance, and special fabrication needs | Which items are requirements rather than preferences? |
| Quantity | Prototype, pilot, low-volume, and expected repeat demand | Is the quote for one build or an ongoing program? |
| Revision status | Controlled Gerber, BOM, CPL, drawing, firmware, and test versions | Which files belong to the quoted release? |
| Firmware / programming | Approved file, device, interface, serialization, security, and result needs | Who provides firmware and how is success recorded? |
| Testing requirements | Method, fixture, connection, steps, limits, pass/fail criteria, reports, and retest | What testing is actually included in the requested scope? |
| Delivery destination | Country or region, packaging, labels, shipment preference, and delivery term | Which logistics items belong in the quotation? |
| Requested lead time | Required or target date and any schedule dependency | Is the timing feasible after material confirmation? |
Complete inputs allow buyers to compare quotations on the same boundary instead of comparing a bare-board price with a complete manufacturing scope.
Component Ownership and Approval Boundaries
State whether the supplier purchases the complete BOM, the buyer provides all parts, or the build uses a mixed model. Customer-supplied components should include exact MPNs, expected quantities, delivery status, and handling requirements.
Approved alternatives and no-substitute parts should be visible before purchasing. Use BOM Sourcing for PCBA when availability, lifecycle, MOQ, or substitution approval is part of the quotation.
Assembly, Programming, and Testing Scope
A quote for PCB Assembly Services should identify SMT, through-hole, mixed assembly, manual soldering, connector or wire work, coating, mechanical operations, inspection, programming, and testing that apply to the project.
Testing requirements should describe the approved firmware, fixture or connection method, procedure, expected results, limits, result data, and retest handling. “Test the board” is not enough to define labor, equipment, responsibility, or acceptance.
Delivery, Lead Time, and Revision Status
Provide the Delivery destination and relevant packaging, label, export, shipment, or delivery-term requirements. State the Requested lead time as a target or fixed requirement and identify dependencies such as customer-supplied parts, firmware, fixtures, or approvals.
Revision status is equally important. A quotation should identify the Gerber, BOM, CPL, Assembly Drawing, firmware, and testing-instruction revisions used for review. Later changes may require updated sourcing, programming, assembly, test, cost, or schedule assumptions.
What Happens When RFQ Information Is Incomplete?
A preliminary review can start with available files, but missing PCB specifications, MPNs, placement data, drawings, quantity, programming, test, or delivery information creates assumptions. The manufacturer should list those assumptions and open questions instead of presenting an incomplete scope as a firm production quote.
Use the concise PCBA Quotation Checklist before submission. If the project needs PCB fabrication, sourcing, assembly, testing, packaging, and delivery coordinated together, review Turnkey PCB Assembly.
RFQ Preparation Workflow
- Select the controlled Gerber, BOM, CPL, drawing, firmware, and test revisions.
- Confirm PCB specification, quantity, component ownership, and approved alternatives.
- Define assembly, programming, inspection, and testing requirements.
- Add delivery destination, packaging, requested lead time, and other commercial constraints.
- Mark unavailable information and request a preliminary review where necessary.
- Resolve open assumptions before approving purchasing or production.
Send the available files through the RFQ path when the package is ready for manufacturing review.
FAQ
What files are required for an accurate PCBA quote?
Provide Gerber and drill data, BOM, CPL or pick-and-place data, Assembly Drawing, PCB specifications, quantity, controlled revisions, and applicable firmware, programming, testing, packaging, and delivery requirements.
Can a supplier quote with incomplete files?
A preliminary review may be possible, but the supplier should identify missing information and assumptions. A firm production scope normally requires the controlled manufacturing package.
Why must quantity be included?
Quantity affects material purchasing, setup allocation, panel planning, production route, inspection, testing, packaging, and expected repeat-order decisions.
Should customer-supplied components be listed?
Yes. Identify exact MPNs, quantities, expected overage, delivery status, and handling or traceability requirements so they are not included incorrectly in supplier purchasing.
Does a quote need firmware and test information?
Yes when programming or functional testing is requested. The supplier needs the approved firmware, method, fixture or connection instructions, procedure, expected results, and pass/fail criteria.