Short answer: The cheapest board is rarely the lowest-cost board because real cost is created in production, not in CAD. A low unit price says nothing about yield loss, rework and scrap, test time, slow ramp-up or the engineering hours spent firefighting – and those costs often exceed the saving. A design that pushes tolerances, materials or processes typically suffers unstable yield, and even a few percentage points of yield loss outweigh a small unit-price advantage. Judge a PCB on total cost of ownership: DFM reduces variation, stabilizes yield and shortens time-to-market. The cheapest board is the one that builds right the first time.
In many PCB projects, cost discussions start and end with one number: the board unit price. If that number looks low, the design is considered cost-effective. In reality, this approach hides the costs that matter most.
At Comtec Labs, we regularly see projects where the “cheap” PCB becomes the most expensive option once production begins. The reason is simple: real cost is created in production, not in CAD.
Why Unit Price Is a Poor Cost Metric
Board price per unit ignores:
Yield loss
Rework and scrap
Test time
Slow production ramp-up
Engineering firefighting
These costs often exceed the savings from a lower unit price.
Hidden Cost 1: Yield Loss
Designs that push tolerances, materials, or processes often suffer from unstable yield.
Even a few percentage points of yield loss quickly outweigh small unit-price savings.
Hidden Cost 2: Rework and Repair
Poor manufacturability leads to:
Extra inspection
Manual rework
Field returns
Rework consumes time, labor, and margin.
Hidden Cost 3: Slow Ramp-Up
Designs that ignore manufacturing reality require tuning and iteration during ramp-up.
Time lost here delays revenue.
DFM and Total Cost of Ownership
True cost control focuses on total cost of ownership. DFM reduces variation, stabilizes yield, and shortens time-to-market.
The cheapest board is the one that builds right the first time.
Key facts
- Board unit price ignores yield loss, rework and scrap, test time, slow ramp-up and engineering firefighting.
- Even a few percentage points of yield loss quickly outweigh a small unit-price saving.
- Poor manufacturability shows up as extra inspection, manual rework and field returns – all paid for after the purchase order.
- Real cost control looks at total cost of ownership; DFM reduces variation, stabilizes yield and shortens time-to-market.
Frequently asked questions
Why is PCB unit price a poor measure of cost?
Because it only covers the bare board or assembly price. Yield loss, rework and scrap, test time, slow ramp-up and engineering time are paid separately and often exceed the saving from a cheaper board.
How does yield loss affect PCB cost?
Every failed board carries its full material and assembly cost plus inspection and rework time. A few percentage points of yield loss on a design that pushes tolerances quickly cancels a lower unit price.
What are the hidden costs of a poorly manufacturable PCB?
Extra inspection, manual rework, field returns and a slow production ramp-up that needs tuning and iteration – time that also delays revenue.
How does DFM lower total cost of ownership?
DFM removes the design features that cause variation, so yield stabilizes, rework drops and the ramp-up is faster. The lowest-cost board is the one that builds right the first time.
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PCB repair and modifications
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