A PCBA quote needs more than Gerber files. For an accurate PCB assembly quotation, send Gerber files, drill files, BOM, CPL, stackup if needed, quantity, lead-time target, and test requirements. These files tell the manufacturer what to fabricate, what to source, where to place parts, and how the finished board should be accepted.
If those details are missing, the quote usually slows down. The factory may need to ask about part numbers, component alternates, CPL rotation, polarity, test scope, packaging, or shipping terms before pricing the build. That is why a complete RFQ package is the fastest path to a reliable quote.
For the broader workflow, see the turnkey PCBA quote process and how these files move into the printed circuit board assembly process.
Key Takeaways
- A complete PCBA quote package includes Gerber, drill files, BOM, CPL, quantity, lead time, and test requirements.
- BOM and CPL consistency is critical because sourcing and SMT placement depend on matching designators.
- Testing, IPC class, coating, programming, packaging, and shipping terms can change quote scope.
- LEADHUI PCB can review your RFQ package before assembly to reduce avoidable clarification loops.
What Is the Minimum File Set for a PCBA Quote?
IPC’s electronics assembly benchmark releases cover assembly metrics such as yields, defect rates, DPMO, rework/scrap, customer returns, supplier performance, and inspection/test methods (IPC, Quality Benchmark Study for Electronics Assembly). A practical PCBA quote starts by defining the files and requirements that control those manufacturing risks.
The minimum file set is Gerber files, drill files, BOM, CPL or pick-and-place file, quantity, lead-time target, and any assembly or test requirements. A PCB-only quote may only need fabrication data. A PCBA quote also needs component sourcing, placement, inspection, and test information.
| File / Requirement | Required? | Why the manufacturer needs it |
|---|---|---|
| Gerber files | Yes | Defines copper, mask, silkscreen, paste, and outline |
| Drill files | Yes | Defines plated and non-plated holes |
| BOM | Yes | Defines components to source and assemble |
| CPL / pick-and-place | Yes for SMT | Defines location, side, and rotation |
| Quantity | Yes | Affects PCB pricing, parts sourcing, and setup cost |
| Lead-time target | Yes | Affects sourcing urgency and production planning |
| Test requirements | Required if tested | Defines inspection and acceptance scope |
| Stackup | Required for multilayer / impedance | Defines layer structure, copper, dielectric, material |
Also separate PCB quantity from assembled PCBA quantity. Some buyers order extra bare PCBs for backup or future builds. Others quote prototypes first, then pilot and production quantities later. State that clearly so the supplier can price setup, sourcing, and lead time correctly.
Why Are Gerber and Drill Files Needed?
PCB assembly process guides from JLCPCB, Sierra Circuits, and PCB Assembly Express all place file or order review before solder paste printing, pick-and-place, reflow, and inspection (JLCPCB, Printed Circuit Board Assembly; Sierra Circuits, PCB Assembly Process Overview). Gerber and drill files define the bare PCB that will be assembled.
Gerber files describe the PCB layers and artwork. They typically include copper layers, solder mask, silkscreen, paste layer, board outline, and mechanical details. Drill files define plated and non-plated holes. Without these files, the manufacturer cannot confirm pad geometry, holes, connector fit, or board shape.
Revision control matters. The Gerber, BOM, and CPL should all describe the same board revision. If the Gerber revision is newer than the BOM or CPL, designators and footprints may not match. That can turn a quote request into an engineering clarification loop.
| Gerber / drill item | What to check before RFQ | Quote risk if missing |
|---|---|---|
| Copper layers | All signal and plane layers exported | Wrong layer count or missing copper |
| Solder mask | Top and bottom mask included | Pad exposure mismatch |
| Silkscreen | Reference designators readable | Placement review confusion |
| Paste layer | SMT pads included | Stencil review delay |
| Board outline | Shape, slots, cutouts clear | Mechanical mismatch |
| Drill file | Plated and non-plated holes included | Connector or via errors |
printed circuit board assembly process
Why Is the BOM the Most Important PCBA Quote File?
IPC-A-610 defines acceptability expectations for electronic assemblies, but the assembly cannot be quoted accurately unless the supplier knows what components must be sourced and installed (IPC, IPC-A-610). The BOM is the sourcing backbone of a PCBA quote.
A good BOM does more than list values such as “10k resistor” or “0.1uF capacitor.” It identifies the exact manufacturer part number, quantity, reference designator, package, value, tolerance, voltage rating, approved alternates, and DNP/DNI status. That lets the supplier check availability, pricing, lead time, and substitution risk.
| BOM field | Example | Why it matters |
|---|---|---|
| Designator | R1, R2, C5, U1 | Matches schematic, CPL, and assembly location |
| Quantity | 12 | Controls sourcing and assembly count |
| Manufacturer | Murata, TI, Molex | Reduces ambiguity |
| Manufacturer part number | GRM188R71C104KA01D | Enables exact sourcing |
| Package / footprint | 0603, QFN-32, SOT-23 | Must match PCB footprint |
| Value / rating | 10k, 1%, 50V | Prevents wrong electrical selection |
| Approved alternates | Part A or Part B | Gives controlled sourcing flexibility |
| DNP / DNI | Do not populate | Prevents parts from being assembled |
LEADHUI PCB quote reviews often slow down when BOM lines use generic descriptions without full MPNs. A line such as “connector 2 pin” may not be enough. The supplier needs pitch, orientation, current rating, housing style, and approved manufacturer before quoting confidently.
Approved alternates are useful, but they must be buyer-approved. If a part is critical, mark it as no substitute. If the supplier may propose alternates, define what must be approved before purchase.
Citation capsule: The BOM controls component sourcing accuracy, quote reliability, and substitution risk in PCBA manufacturing. A complete BOM should include designators, quantities, manufacturer part numbers, packages, values, ratings, approved alternates, and DNP/DNI notes so the supplier can quote parts and assembly correctly.
prepare a BOM for PCB assembly
What Is a CPL File and Do You Need One?
Pick-and-place is a core SMT step in PCB assembly process guides from JLCPCB, Sierra Circuits, and PCB Assembly Express. A CPL file, also called a pick-and-place or centroid file, tells the placement machine each component’s X/Y position, rotation, board side, and designator.
For SMT assembly, you should send a CPL file. A supplier may provide a rough estimate without it, but accurate assembly setup needs placement data. Without CPL, the factory cannot confidently program pick-and-place, check top/bottom-side components, or confirm orientation.
| CPL field | What it means | What to check |
|---|---|---|
| Designator | Component reference | Must match BOM designator |
| X coordinate | Horizontal placement | Correct CAD export origin |
| Y coordinate | Vertical placement | Correct CAD export origin |
| Rotation | Component angle | Matches assembler convention |
| Side | Top or bottom | Bottom-side parts included |
| Package | Footprint / package | Matches BOM and Gerber footprint |
Polarity is the detail that often causes questions. LEDs, diodes, electrolytic capacitors, ICs, connectors, and modules need clear orientation. If the CPL rotation is ambiguous, an assembly drawing or polarity note can prevent mistakes.
Think of the BOM and CPL as a matched pair. The BOM tells the manufacturer what to place. The CPL tells the machine where and how to place it. If the two files disagree, the supplier has to stop and ask.
Gerber, BOM, CPL, and stackup explained
What Extra Information Improves PCBA Quote Accuracy?
IPC J-STD-001 defines requirements for soldered electrical and electronic assemblies, and IPC-A-610 defines acceptability expectations for electronic assemblies (IPC, J-STD-001; IPC-A-610). Quote accuracy improves when buyers define not only files, but also quality, testing, compliance, and delivery scope.
Stackup is important for multilayer and controlled-impedance boards. Include layer order, dielectric thickness, copper weight, material, finished board thickness, and impedance requirements. Also specify surface finish, solder mask color, panelization requirements, and any mechanical constraints.
Testing scope should be stated before quoting. AOI, X-ray, flying probe, ICT, firmware programming, and functional testing affect cost, fixtures, labor, and lead time. If you expect functional test, include input voltage, cables, firmware, test fixture assumptions, expected signals, and pass/fail limits.
Compliance can also affect supplier review. RoHS restricts hazardous substances in electrical and electronic equipment in the EU, while REACH governs chemical registration, evaluation, authorization, and restriction (European Commission, RoHS Directive; ECHA, Understanding REACH). Include these expectations in the RFQ when they apply.
Why Do PCBA Quotes Get Delayed?
IPC’s benchmark releases include rework, scrap, defects, and inspection/test methods as electronics assembly quality topics. PCBA quotes get delayed when the supplier cannot confirm what to fabricate, what to buy, where to place parts, what substitutes are allowed, or how the finished board should be tested.
Common quote delays start with incomplete BOM data. Missing MPNs, generic descriptions, unclear approved alternates, and obsolete components all require sourcing clarification. Another common group comes from placement data: missing CPL, wrong rotation, missing bottom-side parts, or mismatch between BOM and CPL designators.
| Delay cause | Why it slows the quote | How to fix it |
|---|---|---|
| Missing MPN | Supplier cannot quote exact part | Add manufacturer and full part number |
| Generic BOM line | Electrical or package details unclear | Add value, package, rating, tolerance |
| No CPL | SMT placement cannot be confirmed | Export pick-and-place file |
| BOM/CPL mismatch | Designators conflict | Run consistency check before RFQ |
| Polarity unclear | Orientation may be wrong | Add assembly drawing or polarity notes |
| No test plan | Test labor and fixture unknown | Include pass/fail procedure |
| Quantity unclear | Setup and sourcing assumptions vary | Split prototype, pilot, production volumes |
In LEADHUI PCB file reviews, the fastest quotes usually arrive with matching Gerber, BOM, and CPL revisions plus clear quantity and test scope. The slowest quotes are not always the most complex boards. They are often the least complete RFQ packages.
Need a fast PCBA quote? Send LEADHUI PCB your Gerber, BOM, CPL, quantity, and test requirements for engineering review.
PCBA Quote File Checklist: What Should You Send?
Current PCBA market estimates cluster around roughly $98B-$109B for 2025/2026, depending on source and scope (Grand View Research, Printed Circuit Board Assembly Market Report; Global Market Insights, Printed Circuit Board Assembly Market; ResearchAndMarkets, Circuit Card Assembly Market). With that level of supplier choice, a complete checklist helps buyers compare quotes fairly.
Use this checklist before sending an RFQ. Mark what is required, what is recommended, and what applies only to certain designs. Required recommended and conditional files for a PCBA quote PCBA Quote File Priority Checklist Send required files first, then add recommended and conditional details when they apply. Required ✓ Gerber + drill files ✓ BOM with MPNs ✓ CPL / pick-and-place ✓ Quantity + lead time Recommended ✓ Stackup / materials ✓ Assembly drawing ✓ Polarity notes ✓ Test requirements If Applicable ✓ Firmware files ✓ Coating / potting ✓ RoHS / REACH needs ✓ Packaging / incoterms Table view: required files cover fabrication, sourcing, placement, and quantity; recommended and conditional details improve quote accuracy. Figure 3: Prioritize required PCBA quote files first, then add recommended and conditional details to reduce follow-up questions.
| Category | Include these items | Priority |
|---|---|---|
| PCB fabrication | Gerber, drill, outline, finish, material, thickness | Required |
| Assembly | BOM, CPL, assembly drawing, polarity notes | Required for PCBA |
| Sourcing | MPNs, approved alternates, no-substitute parts, DNP/DNI | Required |
| Stackup | Layer order, copper, dielectric, impedance | Required for multilayer / impedance |
| Testing | AOI, X-ray, flying probe, ICT, functional test, firmware | Required if tested |
| Quality | IPC class, RoHS, REACH, inspection reports | As applicable |
| Commercial | Quantity, lead time, shipping address, incoterms | Required |
| Packaging | ESD bag, labels, panel or individual boards | As applicable |
Before sending, run one final consistency check. Does the Gerber revision match the BOM and CPL? Do BOM designators match CPL designators? Are top and bottom components included? Are polarity notes clear? Is the test method defined? Is the assembly quantity different from bare PCB quantity?
complete turnkey PCBA manufacturing guide
get an accurate PCBA quote
Frequently Asked Questions
What files are required for a PCBA quote?
A PCBA quote usually requires Gerber files, drill files, BOM, CPL, quantity, lead-time target, and test requirements. Add stackup, assembly drawings, firmware, quality expectations, and packaging notes when applicable. These files define fabrication, sourcing, placement, and acceptance scope.
Can I get a PCB assembly quote without a CPL file?
You may get a rough review without CPL, but accurate SMT assembly pricing usually needs it. The CPL defines X/Y position, rotation, side, and designator. Without it, the supplier cannot fully confirm placement setup or orientation risk.
What should a BOM include for PCBA?
A PCBA BOM should include reference designator, quantity, manufacturer, manufacturer part number, package, value, rating, tolerance, approved alternates, and DNP/DNI notes. Missing MPNs or generic descriptions often create sourcing questions before the quote can be finalized.
Do I need to send test requirements for a PCBA quote?
Yes, if testing is expected. Otherwise, the supplier may quote only assembly and basic inspection. Send input voltage, firmware, fixture assumptions, expected outputs, pass/fail limits, and whether testing should be sample-based or 100%.
Why did my PCBA supplier ask follow-up questions?
Follow-up questions usually mean the supplier cannot confirm fabrication, sourcing, placement, substitute approval, quantity, or test scope from the first RFQ package. The most common fixes are complete BOM fields, matching CPL data, clear polarity notes, and defined test requirements.
Conclusion
A PCBA quote needs a complete manufacturing package, not just Gerber files. Send Gerber, drill files, BOM, CPL, quantity, lead-time target, and test requirements first. Add stackup, IPC class, coating, programming, packaging, compliance, and shipping details when they apply.
The goal is simple: give the manufacturer enough information to quote the same build you expect to receive. If you want LEADHUI PCB to review your file package, send your Gerber, BOM, CPL, quantity, and test requirements for fast engineering feedback.
turnkey PCBA quote process
printed circuit board assembly process
