You get a quote. It’s $3,000for100boards\mathrm{.}That\text{’}s$3,000for100boards.That’s30 each. But the parts on DigiKey only cost $8.Sowheredidtheother$8.Sowheredidtheother22 go?

I’ve seen this confusion a hundred times. People think PCBA pricing is a mystery. It’s not. It’s just a stack of costs, and most of them aren’t obvious.

Here’s what you’re actually paying for.

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The Short Version

A PCBA quote usually breaks down like this:

• Components – 40–70% of total cost
• PCB bare board – 10–25%
• Assembly (setup + placement + soldering) – 15–30%
• Testing – 5–15%
• Extras (stencil, programming, coating, shipping) – the rest

Now let me walk you through each piece.

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1. Components – The Big One

This is where most of your money goes. Resistors, capacitors, connectors, ICs, LEDs – they add up fast.

Why it’s expensive

• Some chips cost $10 each by themselves
• Minimum order quantities (MOQs) – you might need 1000 pieces when you only want 50
• Supply chain issues – a $0.50partbecomes$0.50partbecomes5 if it’s out of stock
• Brand vs. generic – original parts are safer, but cheaper alternatives exist

How to save
Let your CM source parts. They have relationships with distributors and can find alternatives you didn’t know existed. Just don’t go too cheap – fake parts are real.

Real example
A Bluetooth chip I used last year: $4.20fromMouser\mathrm{.}MyCMfoundagenuinebatchfor$4.20fromMouser.MyCMfoundagenuinebatchfor2.80 because they bought 5000 at once and shared with another customer. Saved me $1.40 per board.

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2. PCB Bare Board – Not Just a Slab of Green

The empty board itself costs money. How much depends on:

• Layer count – 2 layers is cheap. 6 layers is not.
• Material – standard FR4 is fine. High‑TG, Rogers, or aluminum? Price goes up.
• Surface finish – HASL (cheap), ENIG (gold – more expensive but better for fine‑pitch parts).
• Hole size & density – lots of small vias add cost.

Rule of thumb
A typical 2‑layer, 100x100mm board in small quantity (50–100 pieces) might cost $2\text{–}5each\mathrm{.}A6\text{‑}layerboardcouldbe$2–5each.A6‑layerboardcouldbe15–30.

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3. Assembly – The Part Nobody Thinks About

You have the PCB. You have the components. Now someone has to put them together.

Assembly cost includes:

• Stencil – a one‑time fee ($50–150) for the metal sheet used to apply solder paste
• Programming – loading your pick‑and‑place file into the machine ($50–200, often waived for small runs)
• Placement – per‑component cost. Typical: $0.01–0.05 per resistor/capacitor, more for large ICs or connectors
• Soldering – reflow and wave soldering time
• Labor – manual insertion for through‑hole parts (connectors, big capacitors)

Why small batches hurt
The setup cost is almost the same for 10 boards as for 1000. So your per‑board price is high at low quantities. That’s why 5 boards might cost $20each,but500boardscost$20each,but500boardscost8 each.

Real example
A customer wanted 20 boards assembled. Setup + stencil + programming was $300.Componentswere$300.Componentswere200. PCB was $40.Total$40.Total540, or $27perboard\mathrm{.}Heaskedfor200boardsnexttime\mathrm{.}Totalwas$27perboard.Heaskedfor200boardsnexttime.Totalwas1800, or $9 per board. Same design. Half the per‑board cost.

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4. Testing – Cheap Insurance or Expensive Mistake

Testing adds cost. Skipping testing adds risk.

• AOI (automated optical inspection) – cheap, often included. Cameras check for missing parts and obvious bridges.
• ICT (in‑circuit test) – a custom fixture touches test points. Reliable but costs $200–1000 for the fixture. Worth it for medium to large runs.
• FCT (functional test) – you or the factory powers up the board and runs firmware. Time‑consuming but necessary.

My advice
For prototypes: just do visual inspection + FCT yourself.
For 100+ boards: pay for ICT or at least a simple fixture.
For 1000+ boards: testing is non‑negotiable.

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5. The Hidden Extras

These are the ones that surprise people:

• Conformal coating – adds $1–3 per board
• Box build / housing – if you want the PCBA put into an enclosure
• Shipping – air freight from Asia can double the cost if you need it fast
• Customs / duties – sometimes forgotten until the invoice arrives

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So How Do You Get a Lower Quote?

Here’s what actually works:

1. Increase quantity – even from 50 to 200 drops per‑board cost dramatically.
2. Simplify your BOM – fewer unique part numbers = less setup time.
3. Use standard parts – no weird voltage resistors or odd‑size connectors.
4. Ask your CM for alternative sourcing – they often find cheaper genuine parts.
5. Combine orders – if you have two designs, run them together to share setup.