PCBA MOQ and Lead Time: The Two Numbers Buyers Ask For First
Minimum order quantity and lead time are usually the first two questions in a first enquiry, and they are the two that get answered least usefully. A supplier who answers with a single figure for each is describing an average, not a rule. Both numbers are set by the material and the process rather than by policy, and understanding what drives them is what lets a buyer plan a launch date with confidence.
Minimum order quantity: the honest answer
There is no fixed minimum order quantity here, and there does not need to be one. A build of one board can be run, and prototype and volume orders run on the same lines and the same process. What does exist is a practical floor below which the unit price stops being meaningful, and that is a cost effect rather than a rule.
Why small quantities cost more per board
A turnkey build carries costs that do not scale with quantity: a stencil, a setup on the SMT line, a first article inspection, a programming jig if the board is programmed, a test fixture if functional test is specified, and the engineering time to prepare the build. Whether the run is 5 boards or 500, those items are incurred once. Divide them by five and the unit price is dominated by setup; divide them by five hundred and they nearly disappear.
The second effect is material. Component pricing is volume dependent, and at very small quantities the cost of the parts is quoted at catalogue or small-order pricing rather than at production pricing. Tape and reel minimums on some parts are larger than the entire build.
Minimum quantity on the component side
There is a second minimum that has nothing to do with the factory, and it is worth knowing before a small build is quoted. Components are sold in packaging multiples: a reel of 5,000 for a small passive, or a tube or tray for some connectors and larger devices, with a distributor minimum order multiple on top. Where a build needs twelve boards and a part arrives on a reel of five thousand, the material cost for that line is the reel rather than the twelve parts. Unconsumed reels and tubes are normally held and drawn down on the next build of the same product, so the effect is a stocking and cash flow question rather than a loss, but it does change the apparent unit price of a small order. Where a part is common to several products, or a distributor will supply a cut length at a premium, the effect is reduced. How components are bought, inspected and verified is described on the component sourcing page.
What the practical floor looks like
| Build size | What it is good for | What dominates the unit price |
|---|---|---|
| 1 to 5 boards | Design verification, a functional sample, a trade show unit | One-time items and engineering; unit price is not comparable to production |
| 5 to 50 boards | Pilot run, customer assessment units, low-volume instruments | Setup and small-order material pricing |
| 50 to 500 boards | Bridge production, low-volume industrial products | Material and assembly; setup is largely absorbed |
| 500 to 5,000 boards | Regular production | Material, with assembly close to flat |
| Above 5,000 boards | Volume production | Component market price |
The practical reading is this: if the unit price at 5 boards looks alarming, that is expected and it is not a signal about what the board will cost in production. Ask for the price at the volume you actually intend to build, and treat the prototype price as a separate exercise with a separate purpose.
What sets the lead time
Typical turnkey lead time is 2 to 5 weeks from a complete file set. The single most important thing to understand about that range is that the binding constraint is almost always component availability, not machine time. Placement capacity is not usually the problem; a part on allocation is. The placement and soldering capacity behind that statement is set out on the SMT assembly page.
That is why the schedule is built backwards from the material plan. Long-lead and single-source parts are identified at quotation stage and ordered first, buffer stock is agreed where a part is critical, and the production date is set against the slowest item in the plan rather than against the average.
Lead time by order type
The table below is the shape of the answer by order type. It describes the total elapsed time rather than the time each process step takes; the step-by-step breakdown is on the ordering page.
| Order type | Typical elapsed time | What sets it |
|---|---|---|
| Prototype, material in stock | 5 to 8 working days | Stencil, setup slot and engineering preparation |
| Prototype, material to be bought | 2 to 3 weeks | Component availability, especially for less common parts |
| Pilot or small batch | 2 to 3 weeks | Material plan plus one fabrication cycle |
| Volume production, first order | 3 to 5 weeks | Fabrication route, long-lead parts, fixture build if specified |
| Repeat order of a released product | 2 to 3 weeks | Material lead time only; tooling and stencils already exist |
| NPI programme with new fabrication and new fixtures | 5 to 7 weeks | Fabrication validation, fixture design and first article |
What can be compressed and what cannot
Expediting is useful where it is possible and misleading where it is not. Being clear about the difference saves a schedule argument later.
- Can be compressed: queue time before a build starts, which is a matter of production scheduling priority; the quotation turnround where the file set is complete; engineering preparation where the design is already reviewed.
- Cannot be compressed: the time for a component to arrive from a distributor or manufacturer; the number of process steps in fabricating a multilayer board with a controlled-impedance stack-up; reflow and inspection time per board; the cure time of conformal coating, which is a material property.
In practice expediting moves a date by days, not by weeks, and it does so by pulling a build forward in the queue rather than by running the process faster. Where a date genuinely matters, the lever with the most effect is a complete file set at the start and a material plan agreed before the purchase order.
What pushes the date out
- A BOM with descriptions instead of part numbers. It has to be matched before it can be bought, and matching frequently changes the price. The quotation requirements page lists what a BOM needs to carry, and the DFM review is where lifecycle and availability risk is raised.
- A long-lead or allocation-controlled part. One part on a 12 week lead time sets the date for the whole build, which is why it should surface at quotation rather than at material release.
- An incomplete file set. Missing drill data, an assembly drawing without polarity marking, or an unstated impedance requirement each add a round of clarification.
- A late stack-up or finish change. A change after fabrication has started means a new bare board, not a revised one.
- A change to the acceptance class. Class 3 carries more inspection and more records than Class 2, and it is not a field that can be flipped on the line.
- Public holidays. Chinese New Year and the National Day week affect the supply chain as well as the factory. Builds planned across those periods should be scheduled with the gap stated rather than discovered.
How the date is tracked
A single percentage complete is not useful information on a PCBA build, because it hides which stage is behind. Material arrival, bare board readiness, SMT, DIP, test and packing are tracked as separate milestones, and the customer is told when a milestone moves rather than at the end. That is the difference between a schedule that can be planned around and one that has to be checked.
MOQ, lead time and the first order
On a first order the one-time items are what make the price and the schedule look heavier than they will be later: the stencil, any test fixture, any programming jig, and the first article inspection. On a repeat build those already exist, which is why the second order of a released product is both faster and cheaper. Where a programme is expected to repeat, saying so at the quotation stage lets the first order be planned as the first of several rather than as a standalone build.
Getting a committed date
A lead time becomes a commitment when it is tied to a specific file set, a quantity and a material plan. Send the Gerber files, a BOM with manufacturer part numbers, the assembly drawing and the expected quantity to Gelant.lei@kilandu.com. The quotation comes back with the material lines identified, the lead time stated against the slowest part, and any one-time item listed separately. The PCBA cost page explains how the price is built and the prototype page covers what changes when the first build is an engineering sample rather than production.
Is there a minimum order quantity for PCBA?
There is no fixed minimum order quantity. Single boards can be built, and prototype and volume orders run on the same lines and the same process. What exists is a practical floor below which the unit price is dominated by one-time items rather than by the board itself, which is a cost effect rather than a rule.
What lead time should I expect for a turnkey PCBA order?
Typical turnkey lead time is 2 to 5 weeks from a complete file set. The binding constraint is usually component availability rather than machine time, so the schedule is built backwards from the material plan and the production date is set against the slowest part rather than the average.
Can an order be expedited?
Queue time can be compressed through scheduling priority, and quotation turnround can be shortened where the file set is complete. Component transit time and the number of process steps in fabricating the board cannot. In practice expediting moves a date by days rather than by weeks.
Why is a repeat order faster than the first order?
Because the one-time items already exist. The stencil, any test fixture and any programming jig were produced for the first build, so a repeat order of a released product carries material lead time only, typically 2 to 3 weeks.