Which Part of PCB Circuit Board Costs the Most?

1. Major Cost Components Under Normal Circumstances

1. Lamination and Drilling (for Multilayer Boards)

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Lamination:

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The more layers, the higher the cost. For every additional two layers, extra core boards, prepreg (PP sheets), and longer pressing cycles are required. The cost of an 8-layer board is significantly higher than that of a 6-layer board.
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Requires the use of large laminating machines, which consume a lot of energy and take a long time.

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Drilling:

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The number, size, and precision of holes are critical. Drilling is one of the most time-consuming processes in PCB manufacturing.
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The more holes, the smaller the diameter (requiring more expensive drill bits and slower speeds), and the higher the precision requirements (such as blind and buried holes), the drilling time and cost increase dramatically.
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Laser drilling (used for HDI boards) is significantly more expensive than mechanical drilling.

Conclusion: For standard multilayer boards (4-8 layers), the processes related to lamination and drilling (including materials and processing) typically account for the highest proportion of costs.

2. Engineering Design (CAM – for Small Batch/Prototyping)

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Engineers need to performprocess reviews, data processing, panelization, and output production files based on customer files.
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This cost isfixed, regardless of whether you produce 1 piece or 100 pieces, the workload for engineering design is almost the same.
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Therefore, for small batch prototyping (e.g., 5-10 pieces), the engineering design fee allocated to each board may be higher than the material processing cost of the board itself. However, in large-scale production, this fee becomes negligible when spread out.

2. Luxury Options Driving Up Costs (Special Processes)

When PCBs have special requirements, any of the following processes can become the most costly part:

1. High-Density Interconnect (HDI) Technology

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Utilizesblind and buried vias, laser microvias, and via-in-pad technologies.
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Cost Impact: Requires additional laser drilling machines, multiple laminations, and more precise alignment systems, greatly increasing the number of process steps and difficulty. The cost of HDI boards is much higher than that of standard multilayer boards of the same size.

2. Special Materials

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Utilizeshigh-frequency and high-speed materials (such as Rogers, Taconic), high Tg materials, and thick copper foil (for high current applications), etc.
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Cost Impact: These special materials can be several times or even tens of times more expensive than standard FR-4 materials.

3. Surface Treatment

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Conventional treatments likeHot Air Solder Leveling (HASL) are relatively cheap.
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However, Electroless Nickel Immersion Gold (ENIG), Immersion Silver, ENEPIG (for gold wire bonding), hard gold plating (for gold fingers), etc., are more expensive due to the use of precious metals (gold, palladium).

4. Strict Impedance Control

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Requiresmore precise etching control and stricter line width and spacing tolerances, which can lead to a decrease in yield and increased costs.

5. Others

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Solder Mask Color: Colors other than green (such as white, black) may be more expensive.
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Shape Processing: Complex milling and slotting will increase CNC processing time.
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Inspection and Testing: Flying probe testing, Automated Optical Inspection (AOI), impedance testing, etc., will all increase costs.

3. Summary Table of Cost Composition

Cost Component	Main Influencing Factors	Impact on Cost
Material Cost	Material type, size, number of layers, thickness	Fundamental, proportion increases with the number of layers and material grade
Engineering Design (CAM)	File complexity, panelization scheme	Extremely high proportion for small batches, negligible for large batches
Graphic Transfer/Etching	Line width/spacing precision, impedance control	The more precise the requirements, the higher the cost
Lamination	Number of layers, material type, size	One of the core costs, significantly increases with the number of layers
Drilling	Number of holes, hole diameter, hole type (through hole/buried hole)	One of the core costs, micro holes and multiple holes are expensive
Surface Treatment	Process type (ENIG, HASL, etc.)	Using precious metals (gold) increases costs
Solder Mask and Silkscreen	Color, precision	Special colors (such as black, white) are slightly more expensive
Testing Costs	Number of test points, flying probe/test fixture	The more test points, the more expensive; test fixtures have a one-time cost
Shape Processing	Shape complexity, V-Cut or milling	Complex shapes take longer to process

Tengxin Testing Business Introduction (Additional)

The key to controlling PCB costs lies inoptimizing design and ensuring yield. Poor quality or unreliable PCBs can lead to after-sales repair costs far exceeding their manufacturing costs.Tengxin Testing provides professional PCB and PCBA quality assurance services, indirectly helping you control total costs:

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PCB Bare Board Reliability Testing

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Interconnection Stress Testing (IST): Evaluates the lamination quality and reliability of multilayer boards.
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Impedance Testing: Verifies whether impedance control meets standards, avoiding later losses due to signal integrity issues.
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Dielectric Strength Testing / Solder Mask Integrity Testing: Ensures electrical safety and insulation.

PCBA Failure Analysis (FA)

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When a product fails,Tengxin Testing can accurately locate whether the issue is due to PCB quality (such as copper cracking, CAF), design defects, or soldering process problems through methods such asX-Ray, cross-section analysis, and thermal stress testing, helping you improve from the source and avoid mass losses.

Process Certification and Incoming Material Inspection

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Conduct certification testing for new suppliers’ PCBs to ensure their capabilities meet requirements.
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Perform sampling inspections on incoming materials to prevent poor quality boards or process issues from entering the production line.

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