PCB RFQ Checklist: Files Buyers Must Send First

A global Tier-1 electronic interconnect solutions provider once asked us to quote a Cat6a PCB program at 600,000 units per year with CIF Gdańsk (Sea transport) delivery. The commercial target was clear, but the quote stalled because the buyer's internal release process could not provide the Gerber files needed for fabrication pricing. That is the RFQ failure this guide solves: not a lack of supplier interest, but a data package that never becomes quote-ready.

This article is for hardware engineers, sourcing managers, NPI buyers, and contract manufacturing teams who are past concept design and need defensible pricing for PCB fabrication, PCB assembly, or turnkey electronics manufacturing. I am writing from the role of a senior factory engineer with 18 years of PCB manufacturing and PCBA sourcing experience. The objective is practical: help you send the files that let a supplier price the board, source parts, plan assembly, define inspection, and confirm risk without a week of avoidable email.

For technical context, Gerber format is the standard image-based output many PCB fabricators use to read copper, solder mask, legend, paste, and outline layers. IPC electronics standards provide the common workmanship language behind documents such as IPC-A-610, IPC-J-STD-001, IPC-2221, and IPC-2581. ISO 9000 is the quality-management family many buyers reference when traceability and supplier controls matter.

TL;DR

• Send Gerbers, drill data, BOM, centroid file, assembly drawing, and revision notes before asking for final pricing.
• Missing Gerbers stop fabrication pricing; missing centroid data slows SMT route planning and placement review.
• Quote Class 2 and Class 3 separately when IPC-A-610 workmanship level changes inspection and rework expectations.
• For high-volume programs, freeze panelization, test method, packaging, freight term, and annual demand split before supplier comparison.
• A supplier quote is only comparable when every bidder prices the same revision, BOM, acceptance class, and logistics scope.

What a PCB RFQ Package Actually Is

A PCB RFQ package is the controlled file set a supplier uses to calculate fabrication cost, component cost, assembly route, test coverage, lead time, and risk. It is not a screenshot, a schematic alone, or a purchasing note that says quote per attached board. A quote-ready package ties the physical board, component list, placement data, workmanship criteria, delivery scope, and revision control into one manufacturing baseline.

A Gerber file is a PCB fabrication data file that describes board layers such as copper, solder mask, legend, solder paste, and mechanical outline. A bill of materials is a component control document that lists reference designators, manufacturer part numbers, quantities, approved alternates, package details, and sourcing notes. A centroid file is a machine-readable placement file that gives X/Y position, rotation, side, and reference designator data for SMT programming.

The mistake is treating these files as paperwork. In the factory, each file triggers a different quote path. CAM engineers read Gerbers and drill data. Component sourcing reads the BOM. Process engineers read the centroid file and assembly notes. Quality engineers read IPC class, inspection scope, and test expectations. If one path is blind, the quote becomes padded, delayed, or wrong.

"A PCB quote without Gerbers is not a quote; it is a budget guess. On the stalled Cat6a program, the annual volume was 600,000 units, but we still could not price the stackup, panel yield, drill count, or copper area without the fabrication data." — Hommer Zhao, Technical Director

Quick RFQ File Checklist

File or data item	Minimum content	Who uses it	Quote risk if missing	When it is mandatory
Gerber ZIP	Copper, mask, silkscreen, paste, outline, drill layers	CAM and fabrication engineering	Fabrication price cannot be finalized	Every PCB fabrication quote
NC drill data	Plated and non-plated drill hits, slots, tool sizes	CAM and plating review	Hole count, slot cost, and yield risk are unknown	Every routed or drilled board
BOM	MPN, quantity, designator, package, alternates, DNP status	Component sourcing and assembly	Parts cost and availability become guesswork	Every assembly or turnkey quote
Centroid/CPL	X/Y, rotation, side, designator, package	SMT programming and process review	Placement cost and polarity risk are unclear	SMT and mixed-technology assembly
Assembly drawing	Polarity, pin 1, orientation, special placement notes	Assembly and inspection teams	Wrong orientation or manual exception risk rises	Boards with polarized or unusual parts
Fabrication drawing	Thickness, finish, copper, tolerance, stackup, impedance	Fabrication engineering	Supplier may price the wrong board class	Controlled, impedance, HDI, or heavy copper boards
Test requirement	ICT, flying probe, functional test, programming, fixture scope	Test engineering	Quote excludes required fixtures or labor	Any board needing release evidence
Packaging and logistics	Quantity split, delivery term, label, ESD, carton limits	Planning and logistics	Landed cost comparison becomes invalid	Production and export orders

The practical lesson is simple: do not ask three suppliers to quote three different assumptions. If Supplier A includes functional test, Supplier B excludes it, and Supplier C assumes customer-supplied parts, the lowest number is not the lowest cost. It is only the least complete scope.

Must-Have Files Before Final Pricing

Final PCB pricing starts with Gerbers, drill data, and a fabrication drawing when the board has controlled features. Gerbers show layer geometry, but the drawing explains requirements that images cannot carry cleanly: board thickness, finished copper weight, surface finish, solder mask color, controlled impedance, tolerances, panel notes, material class, and any IPC-6012 or IPC-2221 design assumptions. For controlled impedance PCB manufacturing, stackup and trace target data should arrive with the RFQ, not after supplier selection.

Assembly pricing needs the BOM and centroid file. The BOM should list exact manufacturer part numbers, approved alternates, lifecycle notes, DNP parts, consigned parts, and package descriptions. The centroid file should match the same revision as the Gerbers and BOM. If a design has bottom-side SMT, BGA, QFN, fine-pitch ICs, or mixed through-hole connectors, the assembly house needs placement data before it can judge setup, inspection, and rework risk.

A schematic is useful for DFM discussion, but it does not replace manufacturing files. Schematics help engineers understand circuit intent, test points, connector function, and programming requirements. They rarely contain enough information to calculate board panel utilization, paste stencil design, component sourcing cost, or inspection route.

What Changes When the Quote Is Turnkey

A turnkey PCB assembly RFQ means the supplier buys components, fabricates the board, assembles it, inspects it, tests it, and ships the finished PCBA under one commercial scope. That route needs stronger BOM control than a bare-board quote because component risk can dominate the total price. One missing manufacturer part number can create 2 or 3 alternate interpretations, especially for connectors, oscillators, LEDs, inductors, and moisture-sensitive IC packages.

For turnkey electronics manufacturing, separate the BOM into buy, consign, do not populate, customer-approved substitute, and no-substitution lines. Include target annual demand, pilot quantity, production release quantity, forecast split, and expected repeat cadence. A supplier cannot quote the same way for 20 engineering samples, 500 pilot units, and 600,000 annual boards.

Turnkey also changes liability. If the supplier buys parts, the supplier needs enough information to avoid counterfeit risk, obsolete stock, wrong reel format, wrong plating, wrong temperature rating, or wrong package suffix. If the buyer consigns parts, the supplier needs overage quantity, date code restrictions, MSL status, incoming inspection rules, and shortage disposition.

"The BOM is where many RFQs quietly lose control. If the part number field says connector or 10 uF capacitor instead of an approved MPN, the supplier has to price uncertainty, not hardware." — Hommer Zhao, Technical Director

Standards and Acceptance Criteria to Name

Name the acceptance criteria before the quote, because IPC class changes inspection time, rework rules, documentation, and sometimes process route. IPC-A-610 defines acceptability criteria for electronic assemblies. IPC-J-STD-001 defines soldered electrical and electronic assembly process requirements. IPC-2221 gives generic PCB design guidance, while IPC-2581 can carry intelligent fabrication and assembly data when both buyer and supplier workflows support it.

For most commercial products, buyers quote IPC-A-610 Class 2 unless the product's operating environment, uptime requirement, or safety case justifies Class 3. Class 3 does not mean better marketing language. It means tighter acceptability expectations, stronger documentation discipline, and less tolerance for cosmetic or workmanship variation. If an automotive program references IATF 16949, connect that requirement to PPAP, PFMEA, control plan, traceability, and lot records instead of placing the certificate name in isolation.

The standards line belongs in the RFQ, purchase order, drawing, and first article approval record. If the PO says Class 3 but the drawing is silent, the supplier may quote one route and manufacture another. If the drawing says Class 2 but the customer quality team rejects Class 2 workmanship later, the commercial dispute was built into the file package.

High-Volume RFQs Need More Than Unit Quantity

High-volume RFQs need demand shape, not only annual quantity. The Cat6a case had a large figure, 600,000 units per year, but the missing fabrication files prevented technical pricing. Even with files, the supplier would still need launch quantity, monthly split, safety stock plan, panel target, delivery term, and whether the buyer expects sea, air, or mixed freight. CIF Gdańsk (Sea transport) changes landed cost and timing compared with EXW, FOB, or air express.

Volume also changes engineering behavior. A 20-board prototype can tolerate more manual intervention. A 600,000-unit annual board cannot depend on hand fixes, unclear substitutes, or an untested panel. At that scale, the supplier has to evaluate panel yield, solder paste repeatability, AOI coverage, test seconds per unit, packaging density, and component reel logistics before the quote is meaningful.

Use a two-stage RFQ when the design is not frozen. Ask for a budgetary quote from preliminary files, then ask for a final quote after release. Label the status clearly. A budgetary quote should never become the purchase baseline for volume production unless the supplier confirms that the final revision, BOM, test scope, and logistics term still match the assumption set.

Quote-Ready Decision Framework

Buyer situation	Send now	Mark as preliminary	Do not ask for final price until
Bare PCB only	Gerber ZIP, drill files, fabrication drawing	Panel preference and annual demand	Stackup, finish, thickness, and tolerances are frozen
Prototype PCBA	Gerbers, BOM, centroid, assembly drawing	Substitutes, test method, enclosure notes	Polarity and DNP lines are reviewed
SMT production build	Full file package, stencil notes, IPC class	Forecast split and packaging	BOM lifecycle and placement data match the same revision
Mixed SMT and through-hole	Assembly drawing, solder route notes, keepouts	Selective solder vs hand exceptions	Connector clearance and through-hole criteria are approved
High-reliability board	IPC class, inspection scope, test evidence	Environmental or burn-in plan	Quality records and acceptance criteria are contractually aligned
High-volume export order	Annual demand, release schedule, incoterm, pack-out	Safety stock and shipment split	Supplier confirms panel yield, lead time, and logistics assumptions

This framework keeps purchasing from comparing mismatched quotes. A prototype quote can be fast and imperfect. A production quote has to be controlled. The transition point is when the supplier's assumptions start affecting tooling, component buys, test fixtures, and delivery commitments.

Common RFQ Gaps That Create Requotes

The most common gap is revision mismatch. The Gerbers show Rev B, the BOM says Rev A, and the centroid file was exported before the last connector rotation change. A good supplier will stop and ask. A rushed supplier may continue, which is worse because the quote looks complete while the build package is wrong.

The second gap is missing polarity and orientation evidence. LEDs, diodes, tantalum capacitors, QFNs, IC pin 1 markers, board-edge connectors, and cable headers need unambiguous orientation notes. Silkscreen is helpful, but dense boards often remove reference designators or hide polarity marks under components. An assembly drawing or graphical BOM prevents many first article failures.

The third gap is test ambiguity. If the buyer expects ICT, flying probe, firmware loading, calibration, conformal coating inspection, or functional test, the RFQ must say so. Test fixtures, programming labor, pass/fail limits, and retest rules can change both cost and lead time. For test planning, compare our ICT testing service, first article inspection guide, and PFMEA control plan guide.

"When a buyer sends files from three revision folders, our first job is not quoting; it is detective work. A 30-minute file audit before RFQ release can save 3 days of supplier questions." — Hommer Zhao, Technical Director

A Practical RFQ Release Sequence

Start by exporting manufacturing files from one locked design revision. Put the revision in the file name, drawing title block, BOM header, and email subject. Then run a local check: do the Gerbers include paste layers, do drill files match the board outline, do BOM designators match placement designators, and do DNP lines show clearly?

Next, add the commercial scope. State whether the quote is bare PCB, consigned assembly, partial turnkey, full turnkey, or box build. Include quantity breaks that reflect buying reality: for example 20, 100, 500, 2,000, and annual forecast if those levels matter. If the product includes cables, enclosure, potting, or final pack-out, connect the PCBA scope to electronic assembly services instead of quoting the board in isolation.

Finally, define quote comparability. Ask each supplier to state what is included, what is excluded, which parts are not quoted, what alternates are assumed, what lead time is tied to component availability, and what inspection or test evidence is included. A clean quote should expose assumptions, not hide them.

FAQ

Q: What files do I need for a PCB assembly quote?

You usually need Gerber files, NC drill data, a BOM, a centroid or pick-and-place file, and an assembly drawing. For controlled products, add fabrication drawing, IPC-A-610 class, test requirements, and revision notes. If the build includes SMT, the centroid file should include X/Y coordinates, rotation, side, and reference designators.

Q: Can a supplier quote PCB assembly without Gerber files?

A supplier can sometimes give a budget estimate, but final fabrication and assembly pricing need Gerbers and drill data. Without them, the supplier cannot verify layer count, board outline, panel yield, copper area, drill count, slotting, solder mask, paste layers, or stencil needs. For high-volume work, that uncertainty can invalidate the quote.

Q: Is a BOM enough for turnkey PCB assembly pricing?

No. A BOM controls component sourcing, but turnkey assembly also needs fabrication files, centroid data, assembly notes, acceptance class, and test scope. The BOM should include exact MPNs, quantities, reference designators, package details, approved alternates, DNP status, and consigned-part notes. Missing MPNs can create multiple quote interpretations.

Q: Should I specify IPC Class 2 or Class 3 in the RFQ?

Yes. State IPC-A-610 Class 2 or Class 3, and connect it to IPC-J-STD-001 soldering requirements when assembly quality matters. Class 3 can change inspection expectations, rework limits, documentation, and supplier review time. Do not let purchasing quote Class 2 while quality expects Class 3 at first article approval.

Q: What is the difference between a centroid file and Gerber files?

Gerber files describe the PCB layers used for fabrication, including copper, mask, silkscreen, paste, and outline. A centroid file describes component placement for assembly, usually with X/Y coordinates, rotation, side, and reference designator. A board can be fabricated from Gerbers, but SMT assembly needs placement data to program machines correctly.

Q: How should I handle preliminary PCB RFQs before design release?

Label the quote as budgetary and identify which data is not frozen. Send the best available Gerbers, BOM, quantity range, expected IPC class, and known test scope, then request a final quote after release. For production orders, update all suppliers with the same revision so price, lead time, and risk are comparable.

References

• Gerber format
• IPC electronics standards
• ISO 9000 quality management

Final takeaway

A strong PCB RFQ does not try to make the supplier guess faster. It gives engineering, sourcing, assembly, quality, and logistics the same controlled baseline. Send the Gerbers, drill data, BOM, centroid file, drawings, IPC class, test scope, quantity breaks, and freight terms before asking suppliers to compete on price.

If you need a quote review for PCB fabrication, custom PCB assembly, or turnkey electronics manufacturing, send the file package through our contact page. We can flag missing data before it stalls the same way a 600,000-unit annual RFQ can stall.