When you send us a BOM for 50 control boards with 400 line items, you are not looking for a magic price. You are looking for a predictable process. We are Informic, and our daily work is electronics manufacturing for industrial control equipment. This article is a direct answer to the question we hear most from procurement buyers in Eurasia: “How do I get a reliable quotation for high-mix, low-volume PCBA without guesswork?” The short answer: by separating the variables you control from the variables we control, and by using a structured RFQ that leaves no room for assumptions. Here is exactly how we do it.
What High-Mix Low-Volume Really Means for Your Quote
High-mix low-volume (HMLV) is not a niche. For industrial control equipment, it is the norm. You might need 20 units of a motor controller, 100 units of a temperature module, and 5 units of a custom I/O board – all in the same quarter. For a supplier, this creates a different cost structure than high-volume production. We are not running one line for weeks. We are changing setups, handling more unique components, and managing multiple small batches simultaneously.
Technical reference: For related engineering context, see IPC standards and industry resources.
For you, the buyer, this means the lowest unit price is rarely the best indicator. The real cost is hidden in engineering changes, lead time variability, and component availability. A quotation that looks low on paper can become expensive if the supplier does not understand your testing requirements or if they quote with unrealistic component lead times. We focus on making those variables visible before you commit.
What We Need From You: The RFQ That Works
We are not asking for a perfect BOM. We are asking for a complete one. In our experience, the gaps in a BOM cause more delays than any other factor. Here is a practical checklist we use with our own clients:
- Full BOM with manufacturer part numbers (MPN) – not only descriptions. “Capacitor 10uF” is not enough. We need the specific part number or at least the package and voltage rating.
- Quantities per assembly – and total quantity for the year, if you have a forecast. This helps us plan component procurement.
- Approved vendor list (AVL) restrictions – if a component must be from a specific brand, say so. Otherwise, we will use our preferred sources.
- Test requirements – do you need in-circuit test (ICT), functional test, or just visual inspection? This changes the price and the lead time.
- Documentation package – Gerber files, assembly drawings, and any special notes for the PCB. If you have a pcbManufacturing specification, include it.
We are not trying to make your job harder. We are trying to avoid the back-and-forth that happens when a BOM has missing alternates or unclear test points. A good RFQ is the fastest way to a clear quotation.
DFM: The Step That Prevents Cost Overruns
Design for Manufacturing (DFM) is not a buzzword. It is a review we do on every new assembly before we quote. We look for issues that would cause rework or delays in a low-volume run. For example, a component pad size that does not match the datasheet, or a via placed too close to a connector. These are not design flaws – they are production risks. We flag them early.
In a high-mix environment, DFM is even more critical because you do not have the volume to absorb a bad batch. We review the following:
- Component placement spacing – can our pick-and-place machine handle the pitch?
- Solder mask and silkscreen clarity – are reference designators readable after reflow?
- Panelization – for small boards, panelization saves cost. We check if your board is suitable.
- Thermal reliefs – for heavy copper planes, this affects soldering quality.
We do not charge for a DFM review. It is part of our quotation process. When you send us your files, we come back with a list of comments – not to delay you, but to make sure the pcba you receive is the one you designed, without surprises.
Component Sourcing: The Hardest Part of HMLV
In industrial control equipment, you often use components that are not the latest consumer-grade parts. You need industrial temperature ranges, long-life electrolytic capacitors, and connectors that are not in every distributor’s stock. This is where a supplier’s component network matters. We work with multiple distributors and manufacturers across Eurasia, and we use a combination of stock checks and direct sourcing. But we are honest: some components have long lead times. We will not quote a lead time we cannot meet.
When you request a quote, we check the availability of every line item. If a part is obsolete or has a 30-week lead time, we tell you immediately. We also suggest alternatives – not to change your design, but to give you options. For example, a different brand of the same specification might be in stock. You decide. We do not swap parts without your approval. That is a rule we follow.
A Practical Table: What Your Quote Includes
To make the process clearer, here is a table that shows the typical elements in our quotation for a high-mix low-volume PCBA. This is not a price list – it is a scope of work. Use it to compare quotes from different suppliers.
| Quotation Element | What It Covers | Why It Matters to You |
|---|---|---|
| Component cost | Price of all parts, based on current stock and MOQs. | Shows if the BOM has expensive or hard-to-find items. |
| PCB fabrication | Cost of the bare board, including material and layer count. | Ensures the pcbManufacturing is quoted separately from assembly. |
| Assembly labor | Setup, placement, soldering, and inspection time. | Reflects the complexity of the board, not only the number of parts. |
| Testing | ICT, functional test, or custom test fixtures. | Prevents field failures. Clarify what is included. |
| Program management | Engineering support, DFM, and communication. | Shows the supplier is investing in your project’s success. |
We include these line items in every quotation. If a supplier does not break down the cost, ask why. You need to know what you are paying for.
How We Handle Small Batches Without Losing Quality
We run lines for 10 boards and for 10,000 boards. The process is different, but the quality standard is the same. For low volumes, we use more manual inspection and a slower line speed. We also do a 100% visual check on every board, because the cost of a field failure is higher than the cost of extra inspection. Your equipment is used in factories, not consumer devices. A failure can stop a production line. We treat that seriously.
We also keep a library of past DFM issues. If we see a pattern – for example, a specific type of connector that cracks during wave soldering – we flag it in your review. This is not a sales pitch. It is practical knowledge from our daily work.
RFQ Steps: From First Contact to Clear Quote
Here is the exact process we follow when you send a request. It is designed to give you a quotation within five working days, depending on BOM completeness.
- Submit your files – BOM, Gerbers, and any test specs via our quote page.
- Component check – we verify availability and lead times for every part.
- DFM review – we run a design check and send you a report with any questions.
- Quotation – you receive a detailed quote with the table above, including a clear lead time.
- Clarification – if you have questions, you talk directly to our engineering team, not a salesperson.
This is not a rigid process. If you have a special request, we adapt. But having a standard path makes the conversation faster.
FAQ
How do you handle component obsolescence in high-mix low-volume?
We check every line item for lifecycle status. If a part is end-of-life, we tell you before quoting. We also suggest a cross-reference or an alternative manufacturer. We never substitute without your written approval. Our goal is to keep your design stable for the long term.
What is the minimum order quantity for a PCBA quote?
We do not have a fixed MOQ. We quote for any quantity above one board. However, the cost per board will be higher for very small runs because of setup time and component minimums. We will show you the price break points so you can decide if ordering a few extra boards makes sense.
Can you help with component sourcing if we only have a partial BOM?
Yes, but the quote will be preliminary. We can help you find missing parts based on the function and package. However, a complete BOM with part numbers gives you the most accurate price and lead time. We recommend using our components sourcing service if you need help with the search.
