medical device electronics manufacturing: how we make purchasing clearer for two- and three-wheel electric vehicle factories teams

Written by Informic Engineering Team. Technical claims require documented source review before publication.

Medical Device Electronics Manufacturing: How We Make Purchasing Clearer for Two- and Three-Wheel Electric Vehicle Factory Teams

When your factory builds electric two- and three-wheelers, the electronics inside the vehicle controller, battery management system, and charger must meet the same reliability standards as medical device electronics. We see this every day in our work with African manufacturing teams. The purchasing process feels opaque because suppliers hide behind jargon and vague lead times. We do not do that. Here is the direct answer: we treat your EV electronics quote like a medical device quote, which means we give you a clear bill of materials, a defined testing plan, and a fixed price before you commit.

Technical reference: For related engineering context, see IPC standards and industry resources.

This article explains how we structure quotations for EV factories, what information we need from you, and how we separate practical recommendations from verified facts. You will learn the exact steps to get a usable quote, not a marketing document.

Why Medical Device Standards Apply to Your EV Factory

Medical device electronics manufacturing focuses on three things: traceability, thermal management, and failure prediction. Your electric scooter or cargo tricycle operates in dust, heat, and stop-and-go traffic. A controller failure on a delivery route costs you more than a replacement part; it costs you a customer and a day of revenue. We apply the same design-for-manufacturing (DFM) review to your PCBA as we would to a patient monitor. That means we check component derating, solder joint strength under vibration, and conformal coating thickness for humidity.

We do not claim our factory is certified for medical devices. That is a verified fact we cannot state without proof. What we can say is that our engineering team uses the same process discipline you see in medical electronics: every component lot is logged, every reflow profile is recorded, and every test result is stored for your review.

Your First RFQ: What We Need From You

To give you a clear quotation, we need a request for quotation (RFQ) that answers four operating questions. You do not need a complete schematic on day one. We have worked with factories that only had a prototype and a napkin sketch. Here is what matters:

• Operating environment: What is the maximum ambient temperature during the hottest month? Do your vehicles sit in direct sun for hours? This changes our component selection.
• Voltage and current range: Are you using a 48V, 60V, or 72V battery pack? What is the peak motor current during hill starts?
• Production volume per month: We need a realistic number, not a forecast. If you plan to build 200 units next month, we quote for 200 units, not 2,000.
• Testing requirement: Do you need 100% functional testing on each board, or is sampling acceptable? This is a cost driver you control.

Send these details to our quote page, and we will respond with a structured questionnaire if we need more clarity.

DFM Review: We Find Problems Before You Pay

Design for manufacturability is not a buzzword. It is a concrete checklist we run on your files. When you send us your Gerber files and BOM, our engineers look for specific issues that cause delays in African assembly lines:

First, we check pad sizes and solder mask openings. If a pad is too small for the component footprint, the board will have cold solder joints after reflow. Second, we verify that your BOM lists manufacturer part numbers, not only distributor part numbers. This matters because a generic part number can have multiple package variants. Third, we review thermal relief on ground planes. A solid copper pour without thermal spokes makes hand-soldering nearly impossible, and your local technician will waste time fixing bridges.

We provide a written DFM report within two business days of receiving your files. The report lists each issue, the severity, and our recommended fix. You decide what to change. We do not charge for this review, but we do expect that you will review the report before asking for a final price.

BOM Costing: Where the Money Actually Goes

The bill of materials (BOM) is where we earn your trust. We break down every line item into three categories: active components, passive components, and mechanical parts. For each line, we state the manufacturer, the part number, the unit price at your volume, and the lead time from our warehouse or distributor.

Here is a practical example of how we present cost data for a typical 48V motor controller board. This is an illustrative table, not a real quote, because actual prices change weekly with component markets.

We do not hide the fact that active components dominate your cost. Instead, we help you find second-source alternatives that are pin-compatible. This is where our components sourcing team earns its keep. We maintain relationships with authorized distributors, so we can tell you if a part has a 12-week lead time versus a 4-week lead time.

PCBA Assembly: What We Control in Our Facility

Once you approve the BOM and DFM report, we move to PCBA assembly. We use both surface-mount technology (SMT) and through-hole assembly, depending on your board design. For EV applications, we recommend a mix: SMT for small passive components and through-hole for connectors and large electrolytic capacitors that experience mechanical stress.

We run a solder paste inspection (SPI) machine on every board before reflow. This is not a standard practice in all factories, but it catches problems like insufficient paste or solder bridges before they become field failures. After reflow, we perform automated optical inspection (AOI) on both sides of the board. These are verified process steps we use daily, not claims about a specific defect rate.

If your design requires conformal coating for moisture resistance, we apply it after testing. We use acrylic or silicone-based coatings, but the choice depends on your operating temperature and whether you need to rework the board later. We will ask you about this during the DFM review.

Testing: How We Verify Your Boards Work

Testing is not a checkbox. It is a conversation between your engineering team and our test technicians. We ask you to define what "working" means for your vehicle. For example, a controller must turn on, read throttle input, and drive the motor at the commanded speed. But it also must shut down safely if the battery voltage drops below a threshold. We build a test fixture that simulates these conditions.

We offer three levels of testing, and we will recommend one based on your volume and criticality:

• Basic power-on test: We apply power, check for short circuits, and verify that the microcontroller boots. This is suitable for low-volume prototypes.
• Functional test with load: We connect a dummy motor or resistor bank to simulate current draw. This verifies that the power stage switches correctly and that current sensing is accurate.
• Burn-in test: We run the board at elevated temperature for a set duration, typically 2 to 4 hours. This catches early-life failures in capacitors and solder joints. This is common in medical device manufacturing and we recommend it for any EV board that will carry passengers.

We do not claim that burn-in eliminates all failures. It is a statistical tool that increases confidence. We will share the test results as a PDF report with serial numbers and pass/fail status for each board.

How We Handle Component Shortages and Lead Times

Component shortages are a reality in electronics manufacturing. We do not pretend otherwise. Our approach is to give you a rolling 12-week forecast of potential shortages based on our distributor feedback. This is not a guarantee; it is an early warning system. If a specific MOSFET is on allocation, we tell you in week one, not week six.

We also maintain a small inventory of common components for EV controllers, such as 0603 resistors and ceramic capacitors. This buffer stock helps us start assembly while you confirm the final BOM. However, we do not stock custom parts like your specific microcontroller unless you commit to a forecast with us.

For long-lead items, we can order them on your behalf before you approve the full quote. This requires a deposit, but it protects your schedule. We explain this clearly in our quotation terms, so there are no surprises.

PCB Manufacturing: The Foundation of Your Board

Your PCB is the substrate that holds everything together. We work with partner fabs for pcbManufacturing that meet our quality standards. We specify FR-4 material with a Tg (glass transition temperature) of 150°C or higher for EV applications. This prevents the board from softening when the controller heats up during hill climbs.

We also specify the copper weight. Standard boards use 1 oz copper, but for high-current traces on a motor controller, we recommend 2 oz or even 3 oz copper. This reduces resistance and heat generation. Our DFM report will flag if your trace widths are too narrow for the current you plan to pass.

Surface finish matters too. We recommend HASL (hot air solder leveling) for cost-sensitive boards, but ENIG (electroless nickel immersion gold) for boards that need better solderability and flatness for fine-pitch components. We will ask about your reliability requirements before we choose.

Practical Recommendations vs. Verified Facts

We want to be clear about what we know versus what we recommend. Here are our practical recommendations based on daily experience:

Recommendation: Always specify a conformal coating for your EV controller if the vehicle will be used in rainy or dusty conditions. This is a low-cost insurance policy.

Verified fact: We cannot state that conformal coating prevents all moisture failures. That would be an unsupported claim. We can only say that it adds a protective layer that reduces the risk of corrosion.

Recommendation: Order spare PCBs and components for at least 5% of your production volume. This allows you to repair field failures without waiting for a new order.

Verified fact: We do not have data on your specific failure rates. That depends on your vehicle design and usage patterns.

FAQ: Your Questions, Answered

How fast can we get a quotation for our EV controller?

If you send us a complete BOM and Gerber files, we typically respond within three business days with a preliminary quote. If you only have a schematic and a parts list, we need an additional two days for a DFM review. The fastest way to get a quote is to use our quote form and attach your files directly.

Do you offer lower prices for high-volume orders?

Yes, our pricing is tiered based on monthly volume. However, we do not publish a price list because component costs fluctuate. We will show you the price break points in your quotation. For example, the unit price at 500 boards per month is typically 10-15% lower than at 100 boards, but this depends on the specific components. We will explain the cost drivers so you can decide if a higher volume commitment makes sense.

Can you help us redesign our board to reduce cost?

We do this as part of our DFM review. We will suggest alternative components, but we will not change your design without your approval. For example, we might recommend a different microcontroller with similar specs but a shorter lead time. We will also suggest layout changes that reduce the number of PCB layers, which lowers your board cost. This is a collaborative process, not a unilateral one.

FAQ

Sources

1. FDA PMA Quality System: Design Controls
2. FDA Design Control Guidance for Medical Device Manufacturers
3. IPC DFM Profiles and PCBflow