To quote PCB assembly accurately, a supplier needs Gerber files, a BOM, CPL or pick-and-place file, assembly drawings, quantity, component sourcing rules, inspection scope, testing requirements and delivery target. Without those details, the first quote is only an estimate and may change after engineering or purchasing review.
A good PCB assembly quote should show what is included: bare PCB fabrication, component sourcing, SMT, through-hole assembly, inspection, testing, programming, packing and delivery. The buyer should compare assumptions, not only the final price.
What a PCB Assembly Quote Should Include
A PCB assembly quote should include the assembly scope, component sourcing method, PCB fabrication need, inspection and test scope, quantity, lead time and any special process requirements.
If the quote does not say what is included, ask before approving it.
Why PCB Assembly Quotes Need More Than Gerbers
Gerbers describe the board, but they do not fully describe the assembly. The assembler also needs part numbers, placement position, polarity, sourcing rules and test requirements.
Gerber Files and Bare PCB Cost
Gerber files let the supplier quote the bare PCB portion. Board size, layer count, copper weight, material, finish and testing all affect the bare board cost.
If you want PCB manufacturing and assembly from one supplier, confirm whether fabrication is included in the PCBA quote.
BOM Data and Component Cost
The BOM controls component cost. A complete BOM reduces purchasing uncertainty and helps the supplier quote faster.
| BOM Item | Quote Impact | Buyer Check |
| MPN | Defines exact price and availability | Avoid vague part names |
| Quantity | Controls total sourcing volume | Check per-board usage |
| Package | Affects assembly process | Confirm footprint match |
| Substitute | Can reduce delay or cost | Approve before purchase |
CPL File and Placement Cost
The CPL or pick-and-place file controls machine placement. It affects setup time, placement accuracy and rework risk.
Wrong rotation, missing reference designators or unclear top/bottom side can delay quotation and production.
SMT, THT and Mixed Assembly Cost
Assembly cost changes with process type. SMT assembly is different from through-hole soldering, and mixed assembly needs process sequencing.
Tell the supplier if the board has connectors, switches, large capacitors, heat sinks, hand soldering or selective soldering requirements.
BGA and Fine-Pitch Quote Factors
BGA, QFN and fine-pitch parts can increase quote complexity because they may need tighter process control, X-ray inspection or rework planning.
If your design includes BGA parts, link the quote request to BGA assembly capability and inspection expectations.
Testing Scope and Quote Accuracy
Testing can change the quote significantly. AOI is common, but X-ray, ICT, flying probe, programming and functional testing need clearer setup.
| Test Scope | What It Adds | When to Use |
| AOI | Visible solder and placement checks | Most SMT orders |
| X-ray | Hidden solder joint review | BGA or QFN boards |
| Flying probe | Electrical opens/shorts check | Prototype or low volume |
| Functional test | Product behavior check | When pass/fail function matters |
Quantity and Lead Time Factors
Quantity affects setup cost per board, component purchasing, production planning and inspection sampling. Lead time affects whether the supplier can use normal scheduling or must accelerate purchasing and production.
Quote prototype, pilot and production quantities separately if you need a cost roadmap.
Turnkey vs Consigned Assembly Quote
Turnkey and consigned assembly are quoted differently. In turnkey assembly, the supplier handles component sourcing. In consigned assembly, the buyer provides components.
Turnkey PCB assembly can simplify purchasing, but substitute approval and shortage handling must be clear.
Reasons a PCB Assembly Quote Changes
A quote changes when the real build is different from the original assumptions. This often happens after BOM review, component sourcing or engineering review.
- Out-of-stock components.
- Missing CPL or wrong rotation.
- Unclear test requirement.
- BGA inspection not included at first.
- Quantity or lead time changes.
- Special packing or programming added late.
PCB Assembly RFQ Checklist
Use this checklist before asking for a final PCBA quote.
| RFQ Item | Needed Detail | Why It Matters |
| Gerber | Final PCB files | Board cost and DFM |
| BOM | MPN and quantity | Component cost |
| CPL | XY and rotation | Placement setup |
| Testing | AOI, X-ray, FCT or other | Quality scope |
| Delivery | Target lead time and shipping | Schedule and cost |
FAQs About PCB Assembly Quotes
Can I get a PCB assembly quote without a BOM?
You can get only a rough estimate. A final quote needs a BOM with part numbers and quantities.
Do I need a CPL file for quotation?
Yes, for accurate placement review. It helps the supplier confirm coordinates, rotation and side placement.
What makes PCBA quotes expensive?
Component cost, fine-pitch parts, BGA inspection, low quantity, testing, urgent lead time and special process requirements.
Is turnkey assembly more expensive?
It can include sourcing service and purchasing risk, but it may reduce buyer workload and coordination problems.
Does testing need to be quoted separately?
Often yes. Custom functional testing, programming and fixtures can change cost and lead time.
How do I compare PCB assembly quotes?
Compare included services, sourcing assumptions, test scope, inspection records, repair policy and delivery time.
Can a supplier suggest cheaper substitutes?
Yes, but substitutes should be approved by the buyer before purchasing or production.
What causes quote delays?
Missing BOM fields, unclear CPL data, component shortages, unconfirmed test requirements and changing quantities.
Should I quote prototype and production quantities together?
Yes. It helps show the cost difference between sample build, pilot run and mass production.
What should I send to QFPCB?
Send Gerbers, BOM, CPL, assembly drawing, quantity, test scope and delivery target.
Send Files for a PCB Assembly Quote
If you need an accurate PCB assembly quote, send Gerber files, BOM, CPL, assembly drawings, quantity, component sourcing rules and test requirements to [email protected]. QFPCB can review the files and confirm the assembly, sourcing, inspection and delivery scope before quotation.
