What Is the Standard PCB Thickness for Industrial Applications?

I. Industry Benchmark Thickness: Why 1.6mm?

Among all PCB thickness specifications, "1.6mm (0.063 inches)" is widely regarded as the industry's default standard and represents the most common choice for industrial applications.

This standard originated from the 1/16-inch phenolic laminates used in the early days of the electronics industry. As PCB technology evolved, this dimension was fully retained and eventually codified within the IPC-4101 specification, establishing it as the standard thickness for FR-4 materials.

Why has 1.6mm become the mainstream choice?

1) High Supply Chain Compatibility
Structural components—such as connectors, enclosures, and card slots—are universally designed around the 1.6mm dimension, ensuring optimal compatibility.

2) Lowest Manufacturing Cost
PCB manufacturers possess the most mature processes for 1.6mm boards, resulting in high yields, stable lead times, and the most cost-effective production.

3) Optimal Performance Balance
It strikes a sensible balance between mechanical strength, signal integrity, and manufacturing complexity.

Conclusion:
While 1.6mm is not the only standard, it serves as the "default priority option" in industrial design.

II. Industrial PCB Thickness Selection: A Comparison of Typical Scenarios

• Wearable devices: 0.4–0.6mm
• Smartphones: 0.6–0.8mm
• IoT communication modules: 0.8–1.0mm

• The most common range for industrial PCBs:
• Industrial control boards (PLCs)
• Communication equipment
• Home appliances and general electronics

Characteristics:
High versatility + Cost-effective + Mature manufacturing processes
Highest Recommendation Priority: 1.2mm / 1.6mm

3) Thick Boards (2.0mm–3.2mm)
Used in scenarios requiring high strength and high reliability:

• Industrial power supply boards
• Motor drive systems
• Automotive electronics (engine compartment environments)
• Industrial robotics

• 2.0mm ≈ Approx. 2x the rigidity of a 1.6mm board
• 3.2mm ≈ Approx. 4x the rigidity

Key Advantages: Resistance to vibration and bending; extended solder joint lifespan.

4) Ultra-Thick Boards (≥3.2mm)
Suitable for extreme operating conditions:

• High-voltage power supply systems
• New energy charging stations
• High-current power modules

III. Industry-Specific Applications (Key Focus: New Energy Vehicles & Power Supplies)

• 1 oz ≈ 35 μm (Standard)
• 2 oz / 3 oz (Common in industrial applications)
• Thick copper boards (≥ 3 oz) are used for high-current applications.

• 2 oz copper can carry a current of 10 A (with a temperature rise of 10°C).
• Recommended trace width: Approximately 5 mm.

Core Principle:
Board Thickness + Copper Weight = Current-Carrying Capacity + Thermal Stability

IV. The 4 Core Factors Influenced by PCB Thickness

• Large-sized PCBs (>200mm) require increased thickness.
• Applications involving frequent insertion/extraction or vibrating environments → Prioritize thicker boards.
• The stackup structure must be symmetrical to prevent warping.

• PCB thickness directly impacts signal integrity:
• For a 1.6mm board: A 50Ω trace width is approximately 0.3mm.
• Thinner boards → Narrower trace widths → Increased manufacturing complexity.

In high-frequency/high-speed designs:
Thickness is one of the core variables in the impedance model.

3) Copper Thickness and Stackup Structure

• The total PCB thickness is the sum of the following layers:
• Core (Core Board)
• PP (Prepreg)
• Copper (Copper Foil)
• Surface Finish (Surface Treatment)

Key design point for multilayer boards:
A symmetrical stackup is the key to preventing warping.

4) Thermal Performance

• Advantages of thicker boards:
• Provide larger thermal conduction paths.
• Better suited for high-power components.

However, note:
Excessive thickness → Longer thermal paths → Potential reduction in heat dissipation efficiency.
Industry Best Practice:
A combined design approach utilizing thick copper, thermal vias, and copper pouring/planes.

V. PCB Thickness Tolerance Control (Critical, Yet Often Overlooked)

• Incoming material variations
• Lamination process
• Copper thickness accumulation

VI. Conclusion: A Proper Understanding of "Standard" PCB Thickness

Returning to the core question:
What is the standard PCB thickness in industrial applications?

The more precise answer is:
1.6mm serves as the industry benchmark thickness, but it is not the sole standard.

The true engineering rationale is this:
PCB thickness represents the result of a comprehensive optimization process balancing mechanical strength, electrical performance, thermal dissipation requirements, and cost.

VII. Quick Selection Reference Table (Practical Engineering Edition)

In the practical implementation of engineering projects, the selection of PCB thickness is not merely a structural design consideration; it is directly linked to the stability of the manufacturing process and the ultimate reliability of the final product. This is particularly true in applications involving multilayer boards, thick-copper PCBs, or high-power systems, where variations in board thickness—and their corresponding lamination structures, material systems, and tolerance control capabilities—can have a substantial impact on both electrical performance and thermal management.

For instance, in power supply designs, PCB thickness often requires synergistic optimization with copper thickness and the layout of magnetic components. This point is analyzed in detail in another of our technical articles, *Why Is the Performance of Our PCB Transformers Unrivaled?*—which specifically explores the intricate coupling relationships between thick-copper laminations, thermal path design, and electromagnetic performance. Such application scenarios further underscore a fundamental principle: PCB thickness is never an isolated parameter, but rather an integral component of the overall system-level design.

Based on this engineering logic, selecting a PCB/PCBA supplier with proven experience in actual mass production becomes absolutely critical. HongRong (Shenzhen) Electronics Co., Ltd. has dedicated over 20 years to specializing in PCB manufacturing and assembly. Having accumulated extensive experience across sectors such as industrial control, power systems, and new energy vehicles, we are uniquely positioned to provide expert recommendations on appropriate board thicknesses and optimized lamination schemes tailored to the specific requirements of diverse applications. We are capable of reliably mass-producing a wide range of boards—from standard 1.6mm PCBs to thick-copper boards exceeding 2.0mm—and offer comprehensive, one-stop services spanning the entire process from Design for Manufacturability (DFM) reviews to final bulk delivery.