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PCB Assembly Cost: What Drives the Quote
PCB assembly cost, line by line: setup, stencil, placements, through-hole labor, X-ray, test and parts, with a worked 100-board example and ways to cut it.
by the HardwareMap editors4 min read
Contents
PCB assembly cost is the sum of five things: fixed setup, the stencil, placement and soldering labor, components, and inspection and test. Quantity decides which one dominates. This note breaks down each line on a typical quote, works a 100-board example, and lists the design changes that move the number. It belongs to our PCB assembly guide, which covers the process step by step.
The lines on a PCB assembly cost quote
Most quotes, online or emailed, itemize the same categories. PCBWay's online quote form, for example, breaks out PCB cost, PCBA cost, setup cost, stencil cost and components separately (PCBWay PCB assembly).
Shipping, import duties and tariffs sit outside the quote and belong in your landed cost.
What drives PCB assembly cost up
Unique parts, not total parts. Every unique part number is a feeder to load and a reel to manage. A board with 200 placements from 25 unique parts often costs less to set up than one with 120 placements from 70 unique parts. Some online services keep common parts permanently loaded and charge a loading fee for anything else.
Double-sided assembly. Parts on both sides mean two stencils, two print-and-place passes and two trips through the reflow oven. Moving everything to one side is often the single biggest setup saving.
Hidden-joint packages. BGAs, QFNs and LGAs pull in X-ray inspection and tighter process control. Fine-pitch parts and 0201 passives can push you from an economy tier to a standard one.
Through-hole parts. Each through-hole part is soldered after SMT, often by hand at low volume. Labor scales with every joint.
IPC class. Building to IPC-A-610 Class 3 instead of Class 2 adds inspection and documentation. Specify it only when the product or customer requires it.
Sourcing route. On a turnkey order the assembler buys the parts, and its pricing policy on them matters as much as its assembly rate. Some publish it: PCBWay, for one, states it does not mark up parts it sources for turnkey orders (PCBWay assembly capabilities). Others add a handling margin or a minimum buy per reel. Ask for the components line itemized per part, with the supplier and the quantity bought including extras, so you can compare it against distributor prices yourself.
Lead time. Quick-turn builds carry a premium over standard queues. Parts bought from distributor stock at short notice cost more than parts bought on a planned schedule.
A worked PCB assembly cost example
Assume a 4-layer, 80 x 60 mm board, 100 units, turnkey (the assembler buys the parts). One side populated, 160 SMT placements per board from 40 unique parts, including one BGA. Four through-hole connectors. AOI and X-ray. Functional test written by you, run by the assembler.
Read the table two ways. First, components are the largest line even in a small run, and the spread on the other lines mostly reflects vendor tier: an online Shenzhen service sits near the low end, a domestic quick-turn shop nearer the high end. Second, divide by quantity: $18 to $50est per board at 100 units. At 1,000 units the fixed lines spread thinner, parts get volume pricing, and the per-board figure drops. Run the same exercise with a live quote; numbers shift with tariffs, parts markets and vendor tier.
How to cut PCB assembly cost without hurting yield
- Consolidate values. Use one 10k resistor value instead of 10k, 9.1k and 11k where the circuit allows. Fewer unique parts, fewer feeders.
- Put everything on one side. If the layout allows it, one-sided assembly removes a stencil and a reflow pass.
- Use the assembler's stocked parts. Online services keep common passives on permanent feeders. Picking from that list can remove loading fees.
- Swap through-hole for SMT. Surface-mount connectors and electrolytics remove hand labor. Keep through-hole where mechanical strength needs it.
- Panelize. Small boards built in a panel move through the line faster than singles. Ask the assembler for its preferred panel format.
- List alternates on the BOM. Approved alternates let the assembler buy what is in stock instead of quoting a premium for a scarce part.
- Order the right quantity. Moving from 5 to 20 boards often adds little to the total, because setup is fixed.
Most of these are design for manufacturing decisions made in layout, long before the quote. Who buys the parts also changes the quote: see turnkey vs consigned PCB assembly. For the tooling side of the same budget, our injection molding cost note does the same breakdown for enclosures, and hardware startup costs puts both in the full picture.
Frequently asked questions
How much does PCB assembly cost per board?
There is no single number. Per-board assembly cost depends on quantity, the number of placements, how many unique parts need loading, whether both sides are populated, and how many through-hole parts are hand soldered. On small runs, fixed setup and stencil fees dominate. On large runs, components dominate. Get two or three live quotes on the same data package to see the real spread.
Why is my PCB assembly quote so high for 5 boards?
Setup work is the same for 5 boards or 500: programming the machine, loading feeders, cutting a stencil, and running first-article checks. Spread across five boards, those fixed costs look enormous per unit. Many online services quote low-quantity tiers that absorb some of this. Ordering 10 or 20 instead of 5 often costs only a little more in total.
Do components or assembly labor cost more?
For most boards above prototype quantities, components cost more than assembly. A board with a processor, memory, a radio module and power parts can carry tens of dollars of parts against a few dollars of placement labor. That is why sourcing strategy, alternates and parts consolidation usually save more money than negotiating the assembly rate.
Is it cheaper to assemble PCBs in China or the USA?
Online services in Shenzhen usually quote lower assembly rates and parts prices for small and medium runs. Domestic assemblers can still win once you include shipping, import duties, tariffs, engineering time zones and the cost of a failed build. Compare landed cost, not the quote total, and check current tariff rates for your product classification before deciding.
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