How to Prepare a PCB Assembly RFQ for Production

Quick Answer: A production-ready PCB assembly RFQ identifies one controlled product revision and defines the PCB data, BOM, placement information, assembly instructions, sourcing model, inspection, testing, quantities, delivery, and commercial assumptions. Use a 10-part readiness check before comparing quotes; missing or conflicting inputs should be listed as assumptions, not silently guessed by the supplier.

Key takeaways – Separate a planning estimate from a quotation intended for purchase-order release. – Keep Gerber or intelligent data, BOM, CPL, drawings, firmware, and test files on one revision. – State what the supplier must source, build, inspect, test, document, pack, and deliver. – Reconfirm every open assumption before accepting price and lead time.

A folder containing a Gerber ZIP and a BOM may be enough to start a conversation, but it does not automatically define a complete assembly job. Different suppliers can fill the missing scope with different materials, sourcing models, inspection plans, or test assumptions, producing totals that cannot be compared.

This PCB assembly RFQ checklist is designed for engineers and purchasing teams preparing prototypes, pilot builds, or repeat production. It separates budgetary inputs from release-ready data and shows which decisions should be frozen before a purchase order.

Table of Contents

1. What Makes a PCB Assembly RFQ Quote-Ready?
2. How Is a Budgetary Quote Different?
3. Which Files Belong in the RFQ Package?
4. How Should You Prepare the BOM?
5. What PCB, CPL, and Drawing Data Is Needed?
6. Which Assembly Processes Must Be Specified?
7. How Should Inspection and Testing Be Quoted?
8. Which Commercial Terms Change the Quote?
9. What Must Be Frozen Before a Purchase Order?
10. How Do You Run a Final RFQ Readiness Check?

What Makes a PCB Assembly RFQ Quote-Ready?

A quote-ready RFQ lets the supplier identify the product, estimate every included operation, list unresolved assumptions, and explain what will trigger a revised quotation. It should answer five basic questions:

1. What exact product revision is being priced?
2. Which quantities and production stage are included?
3. Who supplies the PCB, components, fixtures, firmware, and packaging?
4. Which assembly, inspection, test, documentation, and delivery scope is required?
5. Which technical and commercial items remain open?

Start with a one-page requirements summary. Include the assembly part number, revision, product stage, requested quantities, destination, target delivery date, sourcing model, applicable acceptance requirements, and an index of the attached files. Name an engineering contact who can answer technical questions and a purchasing contact who can confirm commercial terms.

Quote readiness does not mean that every design decision is final. It means the open items are visible. A supplier can price alternatives for an unresolved laminate, component, coating, or test fixture, but each alternative should have a separate assumption and approval path.

Do not describe a quotation as accurate, firm, or binding merely because the supplier received many files. Component availability, currency, order timing, engineering changes, and customer approvals may still affect price or lead time. The quotation should state its revision, validity period, inclusions, exclusions, and start conditions.

How Is a Budgetary Quote Different?

A budgetary quote supports planning while important engineering or sourcing inputs remain unresolved. A production-ready quote supports a purchasing decision against a controlled scope. Both are useful, but they should not be confused.

Label an early package clearly as budgetary. Tell the supplier which inputs are provisional and ask them to expose their assumptions. This gives management a useful range without creating false confidence.

Before purchase-order release, replace the estimate with a quotation tied to the released package. If the supplier cannot close an item, keep it as a priced option, allowance, or explicit exclusion rather than hiding it in the total.

Which Files Belong in the RFQ Package?

A complete PCBA package usually combines board-manufacturing data, component data, placement data, assembly instructions, and any programming or test information needed to estimate the work. The exact files depend on the scope.

Use one archive with a manifest listing every file and revision. Keep obsolete files outside the active RFQ folder. If a PDF is included as a read-only reference, identify which editable or machine-readable file controls the manufacturing data.

The PCB assembly quote-file guide provides a shorter document list. This article remains the broader RFQ owner because it also covers sourcing, testing, release assumptions, and commercial terms.

How Should You Prepare the BOM?

Prepare an editable BOM that lets the supplier identify, source, price, and control every fitted item. A PDF can be a useful controlled reference, but an editable spreadsheet or structured export reduces manual transcription.

Include, where applicable:

• internal item or line number;
• reference designators;
• quantity per assembly;
• manufacturer name and exact manufacturer part number;
• description, value, package, and footprint;
• fitted, do-not-fit, or variant status;
• approved alternates and the person authorized to approve new substitutes;
• customer-supplied, supplier-sourced, or free-issued status;
• special date-code, traceability, compliance, programming, or handling requirement.

Check that designator counts agree with quantity per board. Confirm that the BOM, CPL, assembly drawing, schematic, and PCB data describe the same variant. Do not use a generic part description where the exact MPN controls electrical, mechanical, safety, or lifecycle performance.

If alternatives are permitted, define equivalency rather than writing “alternate OK” without limits. State whether a supplier may use a listed approved part directly or must obtain written approval for every substitution. For an in-depth field review, use the PCB assembly BOM guide.

The supplier should return unresolved part identities, lifecycle concerns, minimum-order quantities, lead-time risks, and proposed alternates separately. This prevents a sourcing assumption from disappearing into the assembly price.

What PCB, CPL, and Drawing Data Is Needed?

The board data tells the fabricator what to make; the CPL and assembly drawings tell the assembler where and how to place parts. These files overlap for checking purposes but are not interchangeable.

For the bare PCB, provide fabrication data exported from the controlled design revision, plus the construction information not carried clearly in the layer images. Gerber layer files and drill files describe much of the geometry, while a fabrication drawing, job file, or intelligent format can carry material, finish, thickness, stack-up, impedance, and mechanical notes.

For placement, the CPL should include reference designator, X and Y coordinates, rotation, side, and units. State the coordinate origin and rotation convention. A numeric rotation is not enough if the CAD library orientation and machine interpretation are inconsistent. Compare several polarized or asymmetric parts against the assembly drawing before release.

The assembly drawing should show:

• top and bottom component locations;
• polarity, pin-1, diode, capacitor, and connector orientation;
• do-not-fit locations and assembly variants;
• hardware, press-fit, adhesive, wire, or manual operations;
• coating or masking zones;
• critical mechanical interfaces and keep-out information;
• notes that cannot be communicated safely in the BOM or CPL.

Use the centroid file guide for placement-data details. When the scope is bare-board fabrication only, send the board package to the dedicated fabrication-file workflow rather than adding BOM and CPL data unnecessarily.

Which Assembly Processes Must Be Specified?

Specify every process that changes equipment, setup, materials, engineering, inspection, handling, or acceptance. A supplier cannot reliably price “standard assembly” when the product includes special components or post-SMT operations.

Review:

• SMT sides, through-hole content, mixed technology, and expected panel form;
• fine-pitch, bottom-terminated, press-fit, high-mass, odd-form, or manually placed components;
• solder alloy, flux, cleaning, ionic-cleanliness, and handling requirements;
• selective soldering, hand soldering, rework authorization, or special thermal limits;
• underfill, staking, adhesive, potting, conformal coating, or masking;
• depaneling, edge finishing, hardware installation, labels, serialization, and packaging;
• firmware loading, calibration, provisioning, or configuration;
• subassembly, cable, enclosure, or box-build work when included.

For each special operation, supply a drawing, work instruction, or acceptance reference. Identify customer-supplied fixtures, masks, programs, labels, and consumables. If the supplier must design a fixture or process, request the non-recurring engineering scope as a separate line.

Avoid universal cost percentages. The price impact depends on board design, quantity, component mix, equipment, masking, fixture reuse, inspection, and yield assumptions. A useful quote shows the operation and its basis rather than a generic premium.

When fabrication and assembly are quoted together, ask the supplier to keep the PCB construction and assembly operations identifiable. This makes later engineering changes and quote comparisons easier.

How Should Inspection and Testing Be Quoted?

Define inspection and test by purpose, coverage, inputs, outputs, acceptance limits, and required records. Listing equipment names alone does not tell the supplier what must be done.

Separate the scopes:

• bare-board electrical test and fabrication records;
• incoming PCB or component checks;
• solder-paste inspection, automated optical inspection, and X-ray where applicable;
• first-article inspection and customer approval;
• in-circuit, flying-probe, boundary-scan, or functional test;
• programming verification, calibration, burn-in, or environmental screening;
• final visual, dimensional, cleanliness, labeling, packaging, and documentation review.

For functional test, provide the product state, power and connection requirements, safe handling, test sequence, pass/fail limits, expected outputs, firmware, logging requirements, and disposition of a failure. State who supplies or owns the fixture and whether fixture design, validation, maintenance, and storage are included.

Ask what evidence will accompany the shipment: summary report, serial-level result, certificate of conformance, inspection record, X-ray image, traceability file, or failure log. The appropriate package depends on product risk and your quality system.

Do not assume AOI detects hidden solder joints or proves electrical function. Do not assume X-ray, ICT, or functional test is included unless the quotation says so. The PCB inspection-method comparison helps select complementary methods.

Which Commercial Terms Change the Quote?

Quantity, sourcing model, schedule, delivery basis, payment terms, and quote validity can change the total as much as the assembly operations. State them at the same time as the technical scope.

Request relevant quantity breaks for prototype, pilot, and expected production. Explain whether releases will occur in one shipment or under a schedule. Ask how excess components, attrition, minimum buys, reels, cut tape, unused consigned material, and customer-owned tooling will be handled.

Clarify the sourcing model:

• Turnkey: the supplier purchases the agreed components.
• Consigned: the customer supplies some or all components.
• Hybrid: responsibility is split by BOM line or commodity.

For each model, state incoming inspection, shortage handling, substitutions, excess material, and ownership. A low turnkey price is not comparable with a consigned quote that excludes most component cost.

Define the requested delivery location and Incoterm. Ask whether freight, insurance, brokerage, duty, tax, and final delivery are included or excluded. For U.S., Canadian, and Mexican buyers, compare the same delivery basis rather than only the factory subtotal.

The quotation should also identify NRE and recurring charges, currency, payment terms, validity period, material-availability assumptions, lead-time start event, customer approval time, partial-shipment rules, and cancellation or rescheduling terms.

What Must Be Frozen Before a Purchase Order?

Freeze the product revision, approved alternatives, included operations, acceptance criteria, evidence, and commercial assumptions before releasing a purchase order. Anything still open should have an owner and a closure condition.

Use a release matrix:

Ask the supplier to reissue the quotation when a change affects cost, lead time, capability, or acceptance. Minor administrative corrections can be documented without a new total, but the parties should agree on the rule.

Do not rely on an email subject line such as “final files.” Use a manifest or controlled release note showing the archive name, revision, date, and approver. Withdraw superseded packages from active access where practical.

How Do You Run a Final RFQ Readiness Check?

Run one cross-file and commercial review before submission. The goal is to find contradictions that a supplier would otherwise turn into assumptions or clarification questions.

Confirm:

1. Every active file belongs to the same product and revision.
2. The BOM designators and quantities agree with the assembly variant.
3. The CPL designators, side, origin, units, and rotations agree with the BOM and drawing.
4. The fabrication data, drawing, stack-up, drill information, and impedance requirements agree.
5. Solder, coating, programming, hardware, cleaning, and other special operations are defined.
6. Inspection, test, fixtures, limits, reports, and failure disposition are defined.
7. Prototype, pilot, and production quantities are separated.
8. Sourcing responsibility and substitution authority are explicit.
9. Delivery location, Incoterm, requested schedule, validity, NRE, and exclusions are listed.
10. Open questions have an owner and are labeled as assumptions or options.

For a completeness review, send Gerber or ODB++, BOM, CPL, assembly and fabrication drawings, quantities, sourcing model, inspection/test requirements, and destination through the free PCB DFM review. Request a returned list of missing, conflicting, and supplier-proposed items rather than a generic “files look good.”

For the quotation, add the controlled revision manifest, approved quality requirements, delivery terms, and purchasing contacts. Submit the package through the QueenEMS contact page and require the quote to list assumptions, options, exclusions, validity, and requote triggers.

FAQ

Can I get a PCBA quote without complete files?

Yes. Ask for a budgetary estimate and label the missing inputs. The supplier should state assumptions and exclusions; replace the estimate with a controlled quotation before purchase-order release.

Are Gerber and BOM files enough for a PCBA quote?

They may support an initial estimate, but placement data, assembly drawings, sourcing rules, special processes, inspection, testing, quantities, and commercial terms are normally needed to define the complete job.

What commonly causes a PCBA quote to be revised?

New product revisions, BOM or quantity changes, component availability, substitutions, PCB construction changes, added processes, test scope, fixtures, schedule, destination, currency, and expired validity can all require review.

Should PCB fabrication and assembly be quoted together?

They can be quoted together when one supplier manages both scopes. Keep the PCB construction, assembly operations, tests, NRE, and assumptions identifiable so the total remains auditable and comparable.

What should be frozen before issuing a purchase order?

Freeze the controlled file package, approved parts and substitutions, PCB construction, assembly instructions, inspection/test scope, records, quantities, schedule, delivery basis, and all quotation assumptions that affect price or acceptance.

Sources

• IPC-2581 Revision C announcement: https://www.ipc.org/news-release/ipc-releases-ipc-2581-revision-c-generic-requirements-printed-board-assembly-products
• IPC-2581C table of contents and scope: https://www.ipc.org/TOC/IPC-2581C-toc.pdf
• Ucamco Gerber Job File overview: https://www.ucamco.com/en/gerber/gerber-job-file
• Ucamco Gerber specifications and test files: https://www.ucamco.com/en/gerber/downloads
• IPC document revision table: https://www.electronics.org/ipc-document-revision-table

Written by the QueenEMS Engineering Team