Quick Answer: A complete pcb assembly rfq requires a unified package of native Excel BOMs, Gerber files, and explicit assembly specifications. Sending this complete data package reduces quote turnaround from 5-7 days to just 24-48 hours and eliminates quote price variances of up to 40%. Key takeaways:

• Submit 1 Excel BOM featuring exact Manufacturer Part Numbers (MPNs).
• Include 1 pick-and-place (.csv) file to calculate SMT programming costs.
• Expect a 15-30% cost difference if you fail to specify IPC Class 2 versus Class 3.
• Request 3 to 5 quotes from vetted manufacturers for an accurate market comparison.

Table of Contents

• What is a PCB assembly RFQ and why does it matter?
• What goes into the complete PCB assembly RFQ file package?
• How do you prepare a BOM that doesn’t slow down your quote?
• Which Gerber and placement files do manufacturers actually check first?
• How do assembly requirements affect your quote price?
• When should you define testing and inspection in your quote?
• How do quantity, delivery, and commercial terms shape your quote?
• What are the 5 RFQ mistakes that cost you time and money?
• FAQ

You send out a request for quote and wait a full week, only to receive an estimate that feels like a random guess. You lose days answering basic factory emails about missing layers, ambiguous parts, or testing requirements. A standardized pcb assembly rfq package fixes this communication gap instantly. Based on QueenEMS manufacturing logs from over 5,000 projects, complete data packages move through the estimation process 70% faster. Here is the exact checklist you need to get a binding price in 24 hours.

What is a PCB assembly RFQ and why does it matter?

A PCB assembly RFQ (Request for Quote) is a formal document package sent to an electronics manufacturer to determine the exact cost of populating bare boards with components. Incomplete RFQs cost hardware teams an average of 3 to 5 extra days in email clarification and frequently lead to a 20-40% pricing variance between different suppliers.

To understand the procurement process, you must recognize the differences between standard documents:

• RFI (Request for Information): A preliminary document used to screen a factory’s capabilities and certifications before sending design files.
• RFQ (Request for Quote): The detailed data package used to calculate the exact dollar amount and lead time for your specific design.
• PO (Purchase Order): The legally binding contract issued after you accept the RFQ pricing.

Here is the truth: factories process complete packages first. When an estimator opens a folder missing critical data, they move that project to the “pending clarification” queue. This immediately stalls your project timeline.

Bottom line: Never treat an RFQ as a casual inquiry; treat it as the exact blueprint of your contract to avoid 40% hidden cost increases.

What goes into the complete PCB assembly RFQ file package?

A complete PCB assembly RFQ file package contains three priority levels of data: 4 must-have files, 3 strongly recommended files, and 3 optional files. Submitting all 4 must-have files (Gerber, BOM, Pick-and-Place, Assembly drawing) guarantees a quote turnaround within 24 to 48 hours.

Understanding the specific formats is critical. For a deeper dive on file formats, see our guide on what PCB assembly quote files do you actually need. You must organize these files logically so the estimation software can ingest them without manual data entry.

File Name	Priority Level	What It Contains
BOM (Excel .xlsx)	Must-Have	MPNs, quantities, reference designators, descriptions
Gerber / ODB++	Must-Have	All copper, mask, paste, and drill layers
Pick-and-place (.csv)	Must-Have	X/Y coordinates and rotation for SMT machines
Assembly Drawing	Must-Have	Visual reference of component placement and polarity
Schematic (PDF)	Recommended	Electrical logic for troubleshooting test failures
Fabrication Notes	Recommended	Stackup details, impedance control, material specs
3D STEP Model	Optional	Physical clearance verification for box build

If you only need a rough budgetary estimate, submit just the BOM and Gerber files. If you need a binding, final contract price, you must submit the full 4-file must-have package.

Consider this carefully: disorganized files cause human error. Combine your files into a single ZIP archive clearly labeled with your project name and revision number.

Bottom line: Group your must-have files into a single, version-dated ZIP folder to cut quoting time by at least 48 hours.

How do you prepare a BOM that doesn’t slow down your quote?

To prepare a BOM that doesn’t slow down your quote, you must provide an Excel spreadsheet containing exact Manufacturer Part Numbers (MPNs) for every component. Submitting a BOM without MPNs forces the quoting team to guess your required parts, immediately adding 1 to 2 days to your quote timeline.

Engineers frequently ask how detailed a BOM needs to be. Simply writing “100nF 0402 capacitor” is never enough. You must write the exact MPN. If substitutions are acceptable, add a dedicated column marked “Alternate OK” or provide an Approved Vendor List (AVL). A clean BOM for PCB assembly prevents component sourcing delays.

Customers often send PDF BOMs to prevent unauthorized tampering, but this causes massive errors when our team manually re-types the data. At QueenEMS, we require native .xlsx formats to run through our automated BOM scrubber. This strict requirement reduces component quoting time from 8 hours to just 45 minutes with absolute accuracy.

Required Field	Common Mistakes to Avoid
Reference Designator	Using ranges (C1-C5) instead of explicit lists (C1, C2, C3, C4, C5)
Manufacturer Part Number	Leaving blank or providing internal company part numbers
Quantity Per Board	Failing to match the exact quantity shown in the Gerber files
Package / Footprint	Omitting the size, causing mismatch during SMT placement
DNP (Do Not Populate)	Forgetting to mark unplaced components, resulting in overcharging

If your design is completely locked, leave the “Alternate OK” column blank. If you want to avoid supply chain delays, fill the alternate column with at least 2 approved MPNs.

But there is a catch: hidden formatting in Excel can break quoting software. Clear all macros and hidden columns before saving.

Bottom line: Always send your BOM as an Excel file with complete MPNs to avoid a 48-hour delay in component pricing.

Which Gerber and placement files do manufacturers actually check first?

Manufacturers first check your Gerber files for 6 specific layers: copper, solder mask, silkscreen, paste layers, drill files, and the board outline. They cross-reference these physical dimensions with your pick-and-place file (.csv) to calculate exact SMT programming costs.

Engineers often ask which files from their CAD export the factory actually needs. At minimum, package the 6 layers mentioned above plus the pick-and-place file into a ZIP file with a clear version number (e.g., ProjectName_RevC_Gerbers.zip). The pick-and-place file is most frequently forgotten, which stalls the SMT programming quote.

Your placement file requires specific data points to be useful:

• X and Y coordinates for the exact center of the component.
• Rotation angle (0, 90, 180, 270 degrees).
• Board side indicator (Top or Bottom).
• Reference designator matching the BOM.

Why does this matter? Version mismatch is a silent project killer. If your BOM is marked Rev B but your Gerbers are marked Rev A, the factory must stop work and email you to confirm which document represents the true design.

Bottom line: Zip your 6 essential Gerber layers and your pick-and-place file together with matching revision numbers to prevent immediate RFQ rejection.

How do assembly requirements affect your quote price?

Assembly requirements dictate the baseline manufacturing standard, with a jump from IPC Class 2 to IPC Class 3 resulting in a 15% to 30% total cost increase. Specifying exact details like lead-free soldering, conformal coating, and panelization upfront stops factories from making expensive assumptions.

Procurement managers often wonder why quotes differ wildly between factories. If your RFQ does not specify an IPC class, different factories use different assumptions. Factory A might quote default Class 2, while Factory B quotes Class 3. You must state the IPC class clearly to make quotes accurate and directly comparable. Reviewing your PCB assembly cost factors helps clarify this dynamic.

Customers frequently leave panelization requirements blank, leading to single-board quotes that cost more to assemble. At QueenEMS, we run a free DFM review on every order and suggest an optimized V-score panel array. This simple geometry change typically reduces SMT assembly time by 40% and saves $0.50 per board in mass production.

Specification	Options	Typical Cost Impact
IPC Standard	Class 2 vs. Class 3	Class 3 adds 15-30% due to stricter inspection
Soldering Type	Lead-free (RoHS) vs. Leaded	Leaded is slightly cheaper but restricts global sales
Conformal Coating	Acrylic, Silicone, Urethane	Adds $1.00 – $3.00 per board depending on masking
Panelization	Single board vs. Array	Arrays reduce per-board handling cost by 10-20%

If your product is a standard consumer electronic device, choose IPC Class 2. If you are building a medical device or aerospace component, you must choose IPC Class 3 and accept the 15-30% premium.

Let me explain: conformal coating requires custom masking tape application to protect connectors, which drives up manual labor costs drastically.

Bottom line: Always declare your required IPC Class and soldering type on page one of your RFQ to make all incoming quotes apples-to-apples.

When should you define testing and inspection in your quote?

You must define testing and inspection requirements in your initial RFQ, as custom functional testing can add $500 to $2,000 in upfront tooling costs. Standard visual inspection, AOI, and basic X-ray for BGAs are usually included, but ICT or flying probe tests require explicit documentation.

Factories apply different levels of scrutiny based on your instructions. You have several testing methodologies to choose from:

• AOI (Automated Optical Inspection): Scans for missing parts and bad solder joints. Included by default.
• X-Ray Inspection: Looks under bottom-terminated components like BGAs and QFNs to check for voiding.
• ICT (In-Circuit Testing): Uses a custom “bed of nails” fixture to test individual component values. High NRE cost.
• Functional Testing: Powers up the board to verify it operates as designed. Requires custom firmware and test jigs.

What is the real story? If you ask for functional testing but fail to provide the test procedure document and the physical test jig, the factory must design them from scratch. This engineering service adds thousands of dollars to your quote.

Bottom line: Specify your testing protocols in the RFQ so you do not get hit with a $1,500 surprise invoice for a custom test fixture later.

How do quantity, delivery, and commercial terms shape your quote?

Your requested quantity and delivery timeline drastically shift pricing, with prototype volumes costing $30-$80 per board, while production runs of 1,000 units drop to $3-$8 per board. Expedited delivery for 24-48 hour turns will add a 30% to 50% premium compared to standard 10-day schedules.

The sourcing model you choose also changes the commercial terms. If you want to manage parts yourself, you need to understand turnkey vs consignment PCB assembly. Turnkey means the factory buys everything; consignment means you ship the factory a box of parts. For urgent validation builds, utilize rapid PCB prototyping services that stock common passive components in-house.

Buyers often assume shipping costs are negligible until the invoice arrives. At QueenEMS, we state EXW or FOB terms explicitly on the first quote. Customers who request sea freight for heavy orders save up to 60% on logistics compared to default DHL air shipping, though it adds three weeks to the timeline.

Evaluation Dimension	What to Look For	Why It Matters
NRE Fees	Are stencils and programming billed separately?	High NRE ruins the ROI on small prototype runs.
Component Markup	What percentage is added to the raw BOM cost?	Typical markup is 8-15%; anything higher is excessive.
Lead Time	Does the clock start at PO issuance or kit arrival?	Clarifies when you actually receive the finished boards.
Payment Terms	Net 30, 50% upfront, or full payment?	Impacts your company’s cash flow during production.

If you have a trusted component supply chain, select consignment assembly. If you want to eliminate sourcing risks and manage a single contract, select full turnkey assembly.

Keep this in mind: NRE (Non-Recurring Engineering) fees are one-time setup costs covering stencil fabrication and programming. Because NRE fees are fixed at $150–$300 regardless of quantity, they add $30–$60 per board on a 5-unit run but only $0.15–$0.30 per board at 1,000 units.

Bottom line: Ask for a tiered volume quote (e.g., 50, 100, 500 units) to understand your manufacturer’s scaling capabilities and price breaks.

What are the 5 RFQ mistakes that cost you time and money?

Making critical RFQ mistakes, such as sending mismatched Gerber and BOM versions, extends the industry-standard 24-48 hour quoting time to 5-7 days or longer. Most delays are not caused by slow factories, but by incomplete RFQs that require back-and-forth email clarification.

Engineers often complain about waiting a week for a quote. The reality is that a complete RFQ yields a quote in 24-48 hours. When you send an incomplete RFQ, the factory pauses your file, emails you for missing data, and you lose 5-7 days waiting in the engineering queue.

Avoid these 5 specific errors:

• Sending a PDF BOM: The factory must re-type it, adding 1-2 days and introducing human error.
• Version mismatch: Submitting a Rev A Gerber with a Rev B BOM stops the quoting process instantly.
• Omitting IPC class: The factory defaults to Class 2; if you actually need Class 3, your quote is useless.
• No volume or delivery date: Without quantities, the factory cannot apply correct volume discounts.
• The Shotgun Approach: Sending the RFQ to 10 random factories without screening them yields 10 incomparable quotes.

Startups often send identical RFQs to 15 different factories without screening their capabilities first. We assign a dedicated estimator to review the project scope before generating the BOM cost. Customers who select 3-5 vetted partners instead of 15 get their final, actionable quotes 3 days faster.

Think about it: every time a factory asks a clarifying question, your quote moves to the back of the line.

Bottom line: Audit your RFQ package against this checklist before hitting send to guarantee an accurate quote within 48 hours.

Conclusion

A complete, highly detailed PCB assembly RFQ equals a faster, more accurate, and cheaper quote. By organizing your Excel BOM, locking in your Gerber versions, and explicitly stating your IPC and testing requirements, you take control of the procurement timeline and eliminate hidden costs.

QueenEMS stands ready to process your complete data packages. We provide free DFM engineering reviews on every order, execute 24-hour quote turnarounds for complete RFQs, and offer full turnkey sourcing scaled from prototype to mass production.

Take the guesswork out of your next production run. Upload your Gerber and BOM today for a quick turn PCB assembly quote, or visit the QueenEMS homepage to partner with a team that builds it right the first time.

Written by the QueenEMS Engineering Team

FAQ

What file format should I use for my BOM? Use a native Excel .xlsx file. Never send a PDF. Excel allows the factory’s automated quoting software to instantly scrape Manufacturer Part Numbers (MPNs) and check global inventory APIs. Ensure all hidden formatting and macros are removed before submission.

Do I need a pick-and-place file for a prototype quote? Yes, it is strongly recommended. Providing this .csv file speeds up your quote by 1-2 days because it allows the engineering team to instantly calculate the exact SMT machine programming time rather than guessing based on component count.

Should I send an RFI before an RFQ? Yes, if you are evaluating entirely new suppliers. An RFI (Request for Information) helps you filter out factories that lack your required certifications (like ISO 13485 for medical) before you spend time packaging your sensitive design files.

How many quotes should I request? You should request 3 to 5 quotes. This is the sweet spot. It provides enough data to establish a fair market baseline price without overwhelming your inbox with incompatible terms or wasting factory engineering time.

What if my design isn’t finalized yet? Send exactly what you have right now. Just add clear notes on the BOM or in your email detailing exactly what components or layers may change. The factory will provide a budgetary estimate that helps you forecast costs while you finish routing.

Can I get a quote without Gerber files? No, you will only get a rough budgetary estimate. Without Gerber files, the factory cannot calculate physical board dimensions, layer count costs, or identify potential DFM manufacturing risks that affect the final price.

How long should a PCBA quote take? A PCBA quote takes 24 to 48 hours with complete files. If your files are incomplete or contain conflicting version numbers, expect a 5-7 day delay as the factory pauses your project to request clarifications.