This guide walks through the 15 technical and commercial details that determine how a PCBA quotation is priced, how long it takes to produce, and how much risk sits inside the number. Each field is explained from three angles: what the buyer should provide, why the supplier needs it, and how missing information distorts cost, lead time, or quality. Buyers preparing prototype builds, comparing suppliers, or moving toward mass production will find these fields directly applicable to daily sourcing work.
Why an Incomplete RFQ Distorts Every PCBA Quotation
A PCBA quotation is a stacked calculation of bare board fabrication, component sourcing, assembly labor, testing scope, engineering review, and logistics. When any of these inputs is ambiguous, each supplier substitutes its own assumption, and the resulting prices look different even though the physical product is the same. This is the root cause of the “why is this supplier 30% cheaper” question that sourcing teams face every week.
Suppliers protect their margins in different ways. One quotes with the cheapest compatible components; another assumes the highest IPC class. One includes AOI and X-Ray; another quotes visual inspection only. A structured PCB assembly RFQ checklist removes this interpretation gap by locking in scope before pricing begins. The XML-based intelligent data format defined in the IPC-2581 standard for printed board and assembly product information was created precisely to reduce this ambiguity across the design-to-manufacturing handoff.
The real cost of quotation revisions
Every re-quote consumes engineering hours on both sides and delays the project. When RFQ data is incomplete, the initial number is essentially a placeholder. The real quotation appears only after engineering review reveals missing testing requirements, unclear alternates, or an unstated IPC class. Buyers who submit complete PCBA quote requirements typically receive a firm number in one round rather than three.
The 15 RFQ Fields That Shape Your PCBA Quotation
The 15 fields below cover the technical, commercial, and logistical inputs that every EMS engineering team must resolve before pricing. They map to the natural flow of a PCBA project: what the product is, how it is manufactured, how it is tested, how it is sourced, and how it is delivered.
Product Identification and Manufacturing Data Fields
The first block of fields tells the supplier what the product is and gives them the technical files needed to price fabrication and assembly. Incomplete data here is the most common reason a quotation is delayed or later revised.
Fields 1 to 3: project identity, Gerber and BOM
1. Project name, product type and revision. Buyers should provide a clear project name, a short description of the end product, the current PCB revision, and the BOM revision. Suppliers need this to align every downstream file, quotation record, and traceability entry. Without it, mixed-revision files enter production and rework cost climbs.
2. Gerber, ODB++ or IPC-2581 manufacturing data. A complete package includes all copper layers, solder mask, legend, drill, and routing data. The official Gerber file format specification maintained by Ucamco defines what a valid package must contain. Missing layers or outdated formats force the supplier to request replacements, which extends quotation lead time by days.
3. Complete BOM with manufacturer part numbers. The BOM must list reference designator, quantity, manufacturer, manufacturer part number, description, package, and approved alternates. Generic descriptions such as “0.1uF 0603 X7R” without an MPN force the sourcing team to guess a price band, and the quoted component cost may differ from the real purchase cost by 20% or more.
Fields 4 to 6: placement, drawings and PCB specifications
4. Pick-and-place or centroid file. The centroid file provides X, Y, rotation, and layer for each component. Without it, SMT programming must be reconstructed from Gerber, which adds engineering hours and NRE cost. Buyers preparing PCBA manufacturing files should verify that reference designators match the BOM exactly.
5. PCB and PCBA assembly drawings. Assembly drawings show fiducial locations, panelization notes, special orientation marks, and any manual assembly steps. These drawings prevent the supplier from making assumptions about hand-assembled connectors, heatsinks, or shields that are not visible in Gerber.
6. PCB material and fabrication specifications. Layer count, board thickness, copper weight, surface finish, base material, controlled impedance, panelization, and gold finger requirements must all be specified. Missing PCB fabrication specifications force the fabricator to quote a default stack-up, which may not match the electrical or thermal requirements of the actual design.
Commercial and Sourcing Fields That Change Component Cost
The commercial block defines quantity, sourcing responsibility, and substitution rules. These fields have the largest influence on component cost, which typically represents 60% to 80% of a PCBA quotation.
Fields 7 to 9: quantity tiers, sourcing model and alternates
7. Prototype quantity, order quantity and annual forecast. A supplier prices a 20-piece prototype very differently from a 20-piece pilot that precedes a 5,000-piece annual order. Component MOQ, reel packaging, stencil amortization, and fixture cost all depend on the volume horizon. Buyers preparing a low-volume PCB assembly quote should still share the expected 12-month forecast so the supplier can plan component procurement realistically. For readers moving between quantity stages, GNS’s overview of PCBA MOQ, lead time and cost explains how quantity tiers affect the final price.
8. Turnkey, consigned or partially consigned sourcing model. In a turnkey PCBA quotation the supplier procures all components. In a consigned model the buyer ships components to the supplier. Partial consignment splits responsibility, usually for long-lead or customer-specified parts. Without this instruction, the supplier cannot price the sourcing scope correctly. To understand how the file intake and sourcing review flow works, buyers can review what happens when you upload your BOM and PCBA files before submitting the RFQ.
9. Approved alternate-part and substitution rules. Some components have multiple valid manufacturers; others must not be substituted for regulatory or performance reasons. Buyers should mark each BOM line as “approved alternates allowed,” “equivalent only with engineering approval,” or “single-source.” Without this, a low quotation may hide substitutions that will fail incoming inspection or certification testing.
Process, Testing and Quality Fields
The technical scope of assembly and testing is where quotations diverge the most. Two suppliers can produce the same board with a 40% cost difference simply because they quoted different testing coverage. Effective PCBA quotation documents lock this scope in writing.
Fields 10 to 12: assembly processes, testing and IPC class
10. SMT, THT, mixed-assembly and special-process requirements. Buyers should list each process the product requires: SMT reflow, wave soldering, selective soldering, THT hand insertion, press-fit, conformal coating, potting, underfill, cable assembly, and box-build. Special processes materially change line configuration and cost. Discovering conformal coating after the initial quotation typically adds 8% to 15% to the unit price.
11. Programming, AOI, X-Ray, ICT, FCT and burn-in requirements. PCBA testing requirements must be defined line by line. Buyers should state which tests are mandatory, which are optional, and whether test fixtures already exist. When testing scope is missing, some suppliers assume only visual inspection is required and quote accordingly, while others include full functional testing and appear more expensive.
12. IPC class and workmanship acceptance criteria. The IPC-A-610 standard for acceptability of electronic assemblies defines three classes: Class 1 for general electronic products, Class 2 for dedicated service, and Class 3 for high-reliability applications such as medical and aerospace. Soldering process criteria are defined separately by the IPC J-STD-001 requirements for soldered electrical and electronic assemblies. Class 3 typically raises inspection time and rework rate, and it must be declared in the RFQ. Without it, the supplier defaults to Class 2 and the finished product may not pass Class 3 audit.
Compliance, Traceability and Delivery Fields
The final block covers regulatory scope, traceability, and logistics. These items are frequently omitted from early RFQs and are also the most common source of hidden cost after the first quotation.
Fields 13 to 15: certifications, traceability and delivery
13. Target market, certifications and regulatory requirements. Products sold in different regions face different compliance obligations, such as CE, FCC, UL, RoHS, REACH, MDR for medical devices, and IATF 16949 traceability for automotive electronics. The supplier needs the target market to plan compliance testing, documentation, and material declarations. Missing this information leaves certification cost outside the initial quotation.
14. Traceability, labeling and packaging requirements. Serial number generation, barcode formats, date-code control, moisture-sensitive-device handling, ESD-safe packaging, and customer-specific labels all require MES configuration and additional labor. Buyers should specify traceability depth, label artwork, and packaging format at the RFQ stage. Automotive and medical projects typically require unit-level traceability, which is a system investment rather than a per-unit cost.
15. Required delivery date, shipping destination and Incoterms. Delivery date drives component expediting fees, and shipping destination combined with the agreed Incoterm defines who pays for freight, insurance, duties, and import clearance. The Incoterms 2020 rules published by the International Chamber of Commerce are the standard reference used in international PCBA contracts. Without a stated Incoterm, buyers and suppliers often assume different responsibility boundaries, and the invoice includes charges the buyer did not expect.
How GNS Uses Your RFQ Data to Return an Accurate Quote
A structured RFQ package flows through a defined engineering and sourcing review before pricing is finalized. The purpose of the review is not to add friction; it is to convert the buyer’s files into a manufacturable, testable, and traceable production plan.
Engineering and sourcing review workflow
At GNS, incoming RFQs pass through four sequential steps: file intake and completeness check, BOM sourcing risk review, DFM and assembly review, and quotation consolidation. Each step surfaces issues before they become production problems. For example, obsolete components are flagged at BOM review and alternates are proposed with engineering justification. For a deeper view of the intake process, buyers can review the GNS components management approach, which covers authorized channels, sourcing risk, and lifecycle checks.
Prototype, NPI and volume production capabilities
GNS supports the full PCBA lifecycle across prototype, NPI, and volume production, with SMT, THT, mixed-assembly, conformal coating, box-build, and functional testing on the same site. Programming, AOI, X-Ray, ICT, and FCT are available where the product requires them, and IPC-A-610 Class 2 and Class 3 workmanship are supported based on the declared target market. When the RFQ contains the 15 fields above, the engineering team can typically return a firm quotation within one review cycle rather than three.
Downloadable PCBA RFQ Checklist and How to Use It
A downloadable checklist turns the 15 fields into a working document that engineering, sourcing, and quality teams can fill in together. The version below is structured to match the fields explained in this article and can be attached directly to any PCBA supplier quotation request.
What to include in the downloadable checklist
The recommended checklist contains four sections: product identification, technical files, commercial and sourcing scope, and compliance and logistics. Each row captures the field name, the buyer’s input, an “N/A” option where the field does not apply, and a notes column for engineering exceptions such as single-source components or non-standard testing.
How to submit the completed RFQ
Once the checklist is filled in and the technical files are packaged, the fastest way to get an accurate response is to send the complete package to a single point of contact rather than splitting files across emails. Buyers can request a PCBA quote directly through the GNS contact page, which routes the RFQ into the engineering and sourcing review flow described above. For a related view on which BOM, Gerber, and testing files influence quotation accuracy, the PCBA quote checklist covering BOM, Gerber, testing and RFQ files offers a complementary reference.
Conclusion
An accurate PCBA quotation is the direct output of a complete RFQ. When the 15 fields in this checklist are provided upfront, quotations from different suppliers become comparable, engineering review becomes a validation step, and lead time is protected from mid-project re-quoting. Buyers preparing a prototype build, a pilot run, or a first volume order should treat the RFQ package as part of the product itself rather than as paperwork. To move from files to a firm number, get an accurate PCBA quotation by sharing your BOM, Gerber files, testing requirements, target quantities, and delivery expectations with a single engineering and sourcing review team.
FAQ
Q1.Which files are the absolute minimum to receive a preliminary PCBA quotation?
At minimum, a supplier needs the complete BOM with manufacturer part numbers, Gerber or IPC-2581 fabrication data, the pick-and-place file, target quantities, and the required delivery date. Any preliminary quotation issued without these inputs should be treated as an estimate, not a firm price.
Q2.How much can PCBA quotations differ when the RFQ is incomplete?
Quotations for the same board can differ by 20% to 40% purely because suppliers assumed different testing scope, IPC class, or component sourcing model. Locking scope through a structured RFQ closes most of this gap before any price is issued.
Q3.Why does the initial PCBA quote sometimes change after engineering review?
The initial number is calculated from the files as received. Engineering review may then identify obsolete components, missing testing coverage, unstated conformal coating, or IPC class conflicts. The revised quotation reflects the actual manufacturing scope rather than the assumed one.
Q4.Do I need to declare IPC class if my product is not medical or automotive?
Yes. Even industrial and consumer electronics benefit from a declared IPC class, because inspection depth, rework tolerance, and documentation all depend on it. Class 2 is the most common default, but the choice should be explicit, not assumed.
Q5.How should prototype buyers handle volume forecasts they are not yet sure about?
Provide a realistic range rather than leaving the forecast blank. A range allows the supplier to plan component MOQ and tooling amortization, and it prevents the prototype price from being calculated against a single-piece order when a pilot run is likely within months.
