When we receive a request for a PCBA quotation from a two- or three-wheel electric vehicle factory, the first thing we do is not calculate price. The first thing we do is ask for your Gerber files, BOM, and assembly drawings. We do this because a PCBA DFM review is the only honest way to give you a purchasing decision that sticks. Without it, a quote is a guess. With it, you get a clear picture of cost, lead time, and risk before you commit to a production run.
Here is how we turn a DFM review into a clearer RFQ process for your procurement team.
Why we refuse to quote from a BOM alone
We have seen too many purchase orders stall because the quotation was based on a component list without checking the board layout. A BOM tells us what parts you want. It does not tell us if those parts fit on the board, if they are available in Eurasia, or if the assembly process will damage them. For an electric scooter controller or a battery management system, those details matter.
Technical reference: For related engineering context, see IPC standards and industry resources.
When we run a DFM review, we are looking at the physical reality of your board. We check pad sizes, component spacing, thermal relief, and hole diameters. We also check whether your specified parts are still in production. This is not a theoretical exercise. It is a practical filter that removes costly surprises from your supply chain.
The three questions we ask before any RFQ
Before we open your files, we need three answers from you. These are not bureaucratic hurdles. They are the minimum information we need to give you a useful quote.
- What is the annual volume and the expected order batch size? This changes how we source components and whether we can use automated assembly lines.
- What is the operating environment for the final product? Is this controller going inside a sealed battery box or exposed to road vibration?
- What is your target production date? This tells us if we need to expedite component procurement or if we can use standard lead times.
These answers shape the DFM review. A high-volume scooter controller has different manufacturing constraints than a low-volume custom cargo trike inverter.
What a practical DFM review covers
Our review is not a generic checklist. It is a specific examination of your board against our assembly capabilities and the current component market. Here is what we actually look at.
Component footprint and pad design
We check if the copper pads under your chips are large enough for a reliable solder joint. For two- and three-wheel vehicles, vibration is a constant enemy. If a pad is too small, the joint cracks over time. If a pad is too large, the component may float during reflow and shift out of alignment. We flag these issues before you order boards.
BOM completeness and lifecycle status
We cross-check every line item on your BOM against distributor stock in the Eurasian region. We look for three problems: parts that are end-of-life, parts with long lead times, and parts that are only available from a single source. For example, a specific MOSFET for a motor driver might be standard in Asia but hard to source in Eastern Europe. We tell you that upfront.
Panelization and board edge clearance
We review how your boards will be panelized for assembly. If components are placed too close to the board edge, the depaneling process can crack them. We also check for adequate tooling holes and fiducial marks. These are small details, but they prevent assembly stoppages and rework costs.
Solder mask and silkscreen clarity
We verify that the solder mask openings align with the pads. Misaligned mask can cause solder bridges between fine-pitch pins. We also check that the silkscreen does not cover test points. This is a simple check that saves hours of debugging time on the production floor.
A simple DFM review output table
To keep the process transparent, we summarize our findings in a table. This is the document your procurement team should ask for from any PCBA partner.
| Review Item | What We Check | Why It Matters to Your Cost |
|---|---|---|
| Pad size and shape | Copper area, solder mask opening | Prevents cold joints and rework |
| Component spacing | Distance between tall and low parts | Affects wave soldering and inspection |
| BOM lifecycle | Active, obsolete, or limited stock | Directly impacts component price and lead time |
| Test point access | Probe clearance on the board | Determines if we can do ICT or need manual testing |
| Thermal relief | Connections to large copper planes | Affects solderability and heat dissipation |
If a supplier cannot give you this level of detail in a DFM report, you are not getting a manufacturing partner. You are getting a transaction.
How the DFM review changes your quotation
Once we finish the review, we do not only send you a price per board. We send you a quotation with clear options. For example, we might offer two versions of the same board: one using the exact components you specified, and one using functionally equivalent parts that are cheaper and easier to source in Eurasia. This is where the pcba coordination service becomes useful for your team.
We also separate the cost of the bare pcbManufacturing from the assembly cost and the component cost. This breakdown helps you understand where your money goes. If you need to reduce cost, you can see whether it is better to negotiate on the board material, the component sourcing, or the assembly process. This is not a discount game. It is an engineering decision.
Common DFM issues we find in EV two-wheeler boards
We see the same problems recurring in boards from smaller EV startups and even some established factories. Here are three examples we handle regularly.
Undersized thermal vias under motor drivers. The high current through a motor driver generates heat. If the vias that transfer heat to the other side of the board are too small, the component overheats. We recommend adding more vias or increasing their diameter. This is a simple change at the design stage, but a costly rework if discovered after assembly.
Incorrect footprint for through-hole connectors. Many battery connectors are through-hole. If the hole diameter is too tight, the connector pin will not fit without force, which can crack the solder joint. If the hole is too large, the connector wobbles. We measure this against the actual connector datasheet.
Missing fiducials for SMT placement. Some prototype boards come without fiducial marks. Our pick-and-place machine needs these reference points to align the board. Without them, we have to use the board edge, which is less accurate for fine-pitch parts. This increases the risk of misalignment and scrap.
What you should send us for a faster review
To get a clear quotation quickly, prepare these files before you contact us. This is the standard package we use for every components sourcing and assembly project.
- Gerber files (RS-274X or X2) including solder mask and silkscreen layers.
- BOM in Excel or CSV format with manufacturer part numbers and quantities.
- Centroid file (pick-and-place coordinates) if available.
- Assembly drawing with any special notes on test points or mechanical constraints.
- Target price per board and target lead time.
If you do not have a centroid file, we can generate one from your layout, but this adds a small engineering fee. It is usually faster to export it from your ECAD software.
The difference between a DFM review and a simple quote
A simple quote is a price list. A DFM review is a risk assessment. When you request a quotation from us, you are not only asking for a number. You are asking for a plan to build your product without surprises. For a factory producing electric scooters or cargo trikes, a single batch of defective controllers can stop your entire assembly line. That is a risk we help you avoid before you spend money on parts.
We have seen projects where a DFM review saved the customer from ordering a thousand dollars worth of the wrong connectors. We have also seen projects where the review revealed that a cheaper alternative component was available, reducing the total board cost by eight percent. We cannot promise those results for every project, but we can promise that we will look.
Our process in five steps
Here is what happens after you send us your files. This is the actual workflow we follow, and it is the same for every customer.
- File check: We open your Gerbers and BOM to confirm they are readable and complete.
- DFM analysis: We run a software check and a manual review by our manufacturing engineer.
- BOM verification: We check component availability and lifecycle status with our distributors.
- Quotation: We send you a detailed quote with options for alternative parts or processes.
- Feedback: We list any design changes we recommend before production.
This process takes two to three business days for a standard board. If you need it faster, tell us when you send the files. We can prioritize your review.
Questions to ask your PCBA supplier
When you compare quotations from different suppliers, ask them a few direct questions to see if they have done a real DFM review.
- Did you check the pad sizes against the component datasheets?
- Are any components on my BOM obsolete or on allocation?
- Can you provide a panelization drawing for my approval?
- What is your test coverage plan for this board?
If the supplier hesitates or gives vague answers, they have likely not looked at your files carefully. That is a warning sign.
Getting your next quotation right
We know that procurement is about more than price. It is about predictability. A PCBA DFM review gives you that predictability by identifying design and sourcing issues before they become delays. When you send us your files, we treat them as a blueprint for a working product, not only a list of parts to buy.
We are ready to review your next project. Send us your Gerbers and BOM, and we will show you what we find.
FAQ
What is the difference between a DFM review and a standard quotation?
A standard quotation is a price based on the BOM and board size. A DFM review is an engineering check of your design files to identify manufacturing problems before production. It includes checking pad sizes, component spacing, thermal relief, and component availability. The quotation you receive after a DFM review is more accurate and includes fewer hidden risks.
How long does a DFM review take?
For a typical two- or three-wheeler controller board, we complete the review in two to three business days. This includes the software check, the manual engineer review, and the BOM verification. If you have a tight deadline, we can prioritize your project when you send the files, but this may affect the review schedule for other work.
Do we need to pay for a DFM review?
We do not charge a separate fee for a DFM review when you request a quotation for assembly. The review is part of our standard pre-sales engineering support. If you later ask for a detailed report with specific recommendations for design changes, that may be considered a separate engineering service depending on the complexity.
