Heavy copper PCB manufacturer

Heavy Copper PCB Manufacturer for High Current and Power Applications

Friday, August 28th, 2026

A heavy copper PCB manufacturer builds boards for applications that require higher current capacity, improved heat dissipation, and stronger mechanical reliability than standard copper PCB constructions. By increasing copper thickness on inner or outer layers, these PCBs can support high-power circuits used in battery systems, power converters, industrial equipment, EV charging systems, renewable energy controls, and other demanding electrical applications.

EBest Circuit provides custom heavy copper PCB manufacturing with support for thick copper layers, mixed copper stack-ups, high-current designs, and complex multilayer structures. Our engineering team reviews copper thickness, layer configuration, thermal requirements, via structures, and manufacturing feasibility before production to help customers develop reliable power PCB solutions. Send your Gerber files, stack-up requirements, or application details to sales@bestpcbs.com for engineering review and quotation.

Heavy copper PCB with thick copper layers for high-current power applications

What Maximum Copper Thickness Can Be Achieved for Heavy Copper PCBs?

The maximum copper thickness of a heavy copper PCB depends on the layer position, board size, copper distribution, etching requirements, and manufacturing process capability. Unlike standard PCBs using 1 oz or 2 oz copper, heavy copper designs require specialized processing to maintain copper thickness consistency and reliable circuit formation.

EBest Circuit supports the following verified standard and special-project copper ranges. PCB copper weight must be evaluated with board size, copper distribution, spacing, dielectric fill, and process requirements.

Copper Location	Typical Thickness Capability
Inner layer copper	Standard 0.5–5 oz; special projects 5–20 oz
Outer layer copper	Standard 1–5 oz; special projects 5–20 oz
Mixed copper designs	Available after stack-up and DFM review
100 oz+ request	Project-specific engineering review; not a standard capability

For 100 oz+ copper PCB designs, additional engineering evaluation is required because extremely thick copper affects:

Trace geometry and etching compensation
Copper distribution balance
Lamination pressure and resin filling
Thermal stress during manufacturing
Finished board weight and mechanical strength

Heavy copper capability is not only determined by copper thickness. A reliable manufacturing process must also maintain proper layer alignment, insulation spacing, and plated hole quality.

What Heavy Copper PCB Stack-Up Configurations Are Available?

Heavy copper PCBs can be manufactured with different stack-up structures depending on current requirements, thermal performance, signal requirements, and cost targets.

Typical four-layer, six-layer, mixed-copper, and thermal-via PCB stack-up configurations

Typical configurations include:

Stack-Up Type	Typical Application
4-layer heavy copper PCB	Power control boards, industrial electronics
6-layer mixed copper PCB	Power and signal integration
Heavy copper outer layers with standard inner layers	High current connection areas
Heavy copper power layers with thermal vias	Heat-sensitive applications

A high current PCB stackup often combines heavy copper layers with standard signal layers. This approach allows engineers to increase current capacity in specific areas without unnecessarily increasing the cost and weight of the entire PCB.

A typical multilayer structure may include:

Thick copper power planes for current distribution
Standard copper signal layers for control circuits
Dedicated thermal layers for heat spreading
Controlled impedance layers when high-speed signals are required

The final stack-up should be reviewed during the engineering stage to ensure copper thickness, dielectric thickness, and manufacturing capability are properly matched.

Which Materials and Prepreg Systems Are Used for Heavy Copper PCBs?

Heavy copper PCB materials must provide sufficient mechanical strength, thermal stability, and reliable insulation performance under high current operation.

FR-4, high-Tg FR-4, high-resin prepreg, and thermal material systems for heavy copper PCBs

Common material options include:

Material System	Application Advantage
Standard FR-4	General heavy copper applications
High Tg FR-4	Higher thermal reliability
Thermal management materials	Improved heat dissipation
High resin content prepreg	Better copper gap filling

Prepreg selection is especially important for heavy copper multilayer boards. Thick copper creates larger height differences between copper areas, requiring sufficient resin flow during lamination to prevent voids and ensure reliable insulation.

Material selection depends on:

Operating temperature
Current load
Thermal cycling requirements
Mechanical environment
Industry requirements

For high-power applications, engineers should consider both copper thickness and laminate performance rather than focusing only on copper weight.

What Surface Finish Options Are Available for Heavy Copper PCBs?

Surface finish selection depends on component requirements, assembly process, reliability expectations, and storage conditions.

ENIG, lead-free HASL, HASL, and OSP surface finish options for heavy copper PCBs

Common surface finishes for heavy copper PCBs include:

Surface Finish	Typical Application
ENIG	Fine-pitch components and high reliability applications
Lead-free HASL	Cost-effective industrial applications
HASL	Traditional soldering applications
OSP	Short-term storage and standard assembly

For high-current PCBs, surface finish selection should also consider:

Contact reliability
Solder joint performance
Assembly temperature profile
Long-term environmental exposure

The correct surface finish helps maintain reliable electrical connections throughout the product lifecycle.

What Are the Design Rules and Manufacturing Tolerances for Heavy Copper PCBs?

Heavy copper PCB design requires additional attention compared with standard PCB manufacturing because thicker copper changes trace geometry, spacing requirements, and fabrication conditions.

Important design considerations include:

Design Factor	Engineering Consideration
Trace width and spacing	Requires copper thickness compensation
Copper distribution	Avoid excessive imbalance between layers
Clearance	Must consider thicker copper profiles
Impedance control	Requires stack-up-based calculation
Thermal design	Optimize copper planes and heat paths

During DFM review, engineers typically evaluate:

Copper thickness versus minimum trace width
Etching capability
Layer-to-layer registration
Resin filling conditions
Finished board thickness

These high current PCB design guidelines should be confirmed against the proposed copper weight and stack-up during an engineering DFM review. Early communication helps avoid unnecessary redesign during manufacturing.

Which Via Technologies Are Available for Heavy Copper PCB Manufacturing?

Via structures play an important role in heavy copper PCB performance because they influence current flow, thermal transfer, and mechanical reliability.

Available via technologies include:

Through-hole vias
Plated through vias
Thermal via arrays
Large diameter vias
Multiple parallel vias for current distribution

For power applications, engineers often use multiple thermal vias under heat-generating components or create parallel via paths to reduce electrical resistance.

Via design should consider:

Current requirements
Component heat generation
Copper thickness
Assembly conditions

A proper via structure improves both electrical performance and thermal management.

Which Standards and Certifications Apply to Heavy Copper PCBs?

Heavy copper PCB manufacturing for industrial, automotive, medical, and aerospace applications often requires compliance with recognized quality standards.

EBest Circuit supports manufacturing processes aligned with:

Standard / Certification	Application
IPC-6012	Qualification and performance specification for rigid PCBs
IPC-A-600	PCB acceptance criteria
ISO 9001	Quality management system
ISO 13485	Medical device applications
IATF 16949	Automotive applications
AS9100D	Aerospace applications

Specific requirements depend on the final application, customer specifications, and industry regulations.

Quality control processes may include:

Electrical testing
AOI inspection
X-ray inspection when required
Dimensional inspection
Copper thickness verification

What Is the Typical Lead Time for Heavy Copper PCB Production?

Heavy copper PCB lead time depends on copper thickness, layer count, board complexity, testing requirements, and production volume. Review our PCB lead-time guidance as a planning reference; the quotation confirms the actual schedule.

Typical production stages include:

Production Stage	Time Consideration
Engineering review	Based on design complexity
Prototype production	Depends on copper thickness and stack-up
Volume production	Based on quantity and process requirements

Compared with standard PCB production, heavy copper boards may require additional process controls, including:

Special lamination conditions
Copper thickness verification
Additional inspection steps
Manufacturing feasibility review

Providing complete design information during quotation helps shorten engineering evaluation time.

Recommended information includes:

Gerber files
Layer stack-up
Copper thickness requirements
Current load requirements
Application environment

What Design Guidelines Should Be Followed for 100 oz+ Heavy Copper PCBs?

100 oz+ heavy copper PCB requests require project-specific feasibility review because extremely thick copper affects electrical performance, manufacturing processes, and mechanical characteristics. This section provides design inputs for evaluation and does not state an unconditional production capability.

Design guidelines for 100 oz and thicker heavy copper PCBs

Key design guidelines include:

Optimize copper distribution

Large differences in copper area between layers can create lamination challenges and affect board flatness. Balanced copper distribution improves manufacturing stability.

Consider current path design

High-current paths should use:

Wider copper areas
Shorter current routes
Multiple copper layers when required
Optimized connection points

Plan thermal management early

High-power applications should consider:

Large copper planes
Thermal vias
Heat spreading structures
Component placement strategy

Complete DFM review before production

For 100 oz+ designs, customers should provide:

Maximum current requirement
Operating temperature
Mechanical dimensions
Layer stack-up preference
Reliability requirements

Early engineering review helps confirm whether the design is suitable for production.

Why Choose EBest Circuit for Heavy Copper PCB Manufacturing?

Selecting a heavy copper PCB supplier requires more than checking the maximum copper thickness. Manufacturing experience, engineering support, and process control directly affect final PCB reliability.

EBest Circuit provides:

Heavy copper PCB manufacturing capability
Custom multilayer PCB solutions
Mixed copper stack-up support
Engineering DFM review
Prototype and production support
PCB assembly integration capability

With more than 20 years of PCB manufacturing experience, EBest Circuit supports customers from initial design evaluation through PCB production and PCBA assembly.

For heavy copper PCB projects, contact sales@bestpcbs.com with your Gerber files, copper requirements, or application details.

Frequently Asked Questions About Heavy Copper PCBs

What copper thickness is considered a heavy copper PCB?

Heavy copper PCBs generally refer to boards using copper thickness above standard PCB levels, commonly starting from 3 oz copper and extending to much higher copper weights depending on the application.

Can you manufacture 100 oz copper PCB?

100 oz+ copper PCB requests require project-specific engineering review. Feasibility can be confirmed only after board size, layer structure, copper distribution, insulation, drilling, plating, and reliability requirements are evaluated.

What applications use heavy copper PCBs?

Heavy copper PCBs are commonly used in power supplies, battery systems, EV equipment, industrial controls, renewable energy systems, and high-current electronics.

What materials are recommended for heavy copper PCBs?

High Tg FR-4, suitable prepreg systems, and thermal management materials are commonly selected based on operating temperature and reliability requirements.

Can heavy copper PCBs include controlled impedance designs?

Yes. Controlled impedance can be considered when heavy copper layers are combined with appropriate dielectric thickness and stack-up planning.

What files are needed for heavy copper PCB quotation?

Customers should provide Gerber files, layer stack-up information, copper thickness requirements, board dimensions, quantity, and application details.

Request a Heavy Copper PCB Manufacturing Review

Whether you need a standard heavy copper PCB or want feasibility feedback on a 100 oz+ high-current concept, EBest Circuit can review your design requirements and provide manufacturing recommendations.

Send your PCB files or technical requirements to sales@bestpcbs.com for engineering evaluation and quotation.

What Is a Heavy Copper PCB?

A heavy copper PCB is generally understood in the PCB industry as a rigid board with copper conductors of about 3 oz/ft² or more on one or more layers. The term is not a single IPC product class, so the fabrication drawing should state the finished copper thickness required on every layer instead of relying on the words “heavy copper” alone.

Higher pcb copper weight increases the conductor cross-section available for current and heat spreading, but it also changes etching, plating, lamination, drilling, solder-mask coverage, and assembly behavior. Typical applications include power distribution, motor drives, battery systems, power converters, planar magnetics, welding equipment, industrial controls, and high-current protection circuits.

What Copper Thickness Can EBest Circuit Support?

Our current FR-4 process matrix separates routine production from special-process review. Standard designs cover inner-layer copper from 0.5 to 5 oz and outer-layer copper from 1 to 5 oz. Copper from 5 to 20 oz is listed as a special process for both inner and outer layers.

Layer position	Standard process	Special process	Quotation status
FR-4 inner layer	0.5–5 oz	5–20 oz	Confirm finished copper by layer
FR-4 outer layer	1–5 oz	5–20 oz	Confirm base foil plus plating
20–200 oz extreme copper	Not a standard matrix range	Project-specific engineering review	Stackup, size, geometry and quantity required

Our public product page describes extreme copper projects up to 200 oz. That figure should be treated as an engineering-review target, not a blanket promise that can be combined with every layer count, hole size, board dimension, material, or tolerance. A 100 oz+ request requires a dedicated feasibility review before the layout is frozen.

Which Heavy Copper PCB Stackups Are Typical?

Typical stackups keep copper mass as balanced as the electrical design allows. The exact core and prepreg construction is selected after we review copper coverage, finished board thickness, current paths, isolation requirements, hole structures, and assembly constraints.

Configuration	Typical use	Main DFM focus
Two-layer heavy copper	Simple high-current distribution and power conversion	Symmetric copper, isolation spacing and solderability
Four-layer balanced power board	Separate power, ground and control functions	Mirror copper weight and coverage around the centerline
Mixed-copper multilayer	Heavy power layers with lighter signal layers	Resin fill, lamination pressure, thickness control and registration
Extreme-copper custom construction	Very high-current terminals, switches or power modules	Fabrication route must be agreed before detailed layout

For stable heavy copper PCB design, avoid placing most of the copper mass on only one side of the stack. Large differences in copper coverage can increase resin-flow difficulty, thickness variation, bow, and twist. We may request copper balancing or thieving changes that do not alter the electrical function.

Exploded balanced multilayer heavy copper PCB stackup

Which Materials and Prepreg Systems Are Used?

FR-4 is the usual starting material, but the resin system must match the copper volume, thermal exposure, electrical requirements, and final board thickness. Our current material matrix includes low-, mid-, and high-Tg FR-4 options, with high-Tg material required for standard constructions of eight layers or more.

Standard FR-4 prepregs: 1080, 2116 and 7628.
High-Tg FR-4 examples: KB6167, ITEQ IT180, SY-S1170 and S1000-2.
Special material options: selected Isola, Nelco, Rogers, Taconic, PTFE and halogen-free systems, subject to stackup and procurement review.
Core selection: based on dielectric thickness, copper weight, required finished thickness and lamination filling demand.

Prepreg style alone does not guarantee a void-free heavy-copper build. Copper topography, remaining resin volume, pressure distribution, panel size, and copper coverage all affect fill. For deep conductor steps or 100 oz+ structures, we first review whether a conventional multilayer route is appropriate or whether a different conductor architecture is required.

Which Surface Finishes Are Available?

Available FR-4 surface finishes include OSP, HASL, ENIG, immersion silver, immersion tin, ENEPIG, hard gold fingers, and selected combined finishes. The correct option depends on pad flatness, shelf life, soldering process, contact wear, wire bonding requirements, and exposed-copper areas.

Surface finish	Common selection reason	Heavy-copper review point
OSP	Simple solderable copper protection	Handling, multiple heat cycles and exposed-copper plan
HASL / lead-free HASL	Established solderable finish	Surface planarity and large thermal mass
ENIG	Flat pads and broad assembly compatibility	Nickel/gold coverage around high copper steps
Immersion silver or tin	Flat soldering surface	Storage, handling and process compatibility
ENEPIG	Soldering and selected wire-bonding applications	Confirm bonding method and finish specification
Hard gold fingers	Wear-resistant edge contacts	Gold thickness, bevel and selective plating area

The finished board thickness range also varies with the selected finish. If your drawing combines thick copper with selective gold, exposed bus areas, press-fit holes, or large solder terminals, identify those regions clearly in the fabrication notes.

What Design Rules and Manufacturing Tolerances Apply?

Design rules become wider as copper thickness increases because the etching and plating window changes. Do not apply a 1 oz line/space rule to a 6, 10, or 20 oz layer. The values below are from our current FR-4 capability matrix and must still be checked against the full stackup.

Finished copper	Inner standard line/space	Inner special line/space	Outer standard line/space	Outer special line/space
2 oz	6/6 mil	5/5 mil	8/8 mil	6/6 mil
3 oz	10/12 mil	8/8 mil	12/12 mil	9/9 mil
4 oz	12/16 mil	10/10 mil	16/16 mil	12/12 mil
5 oz	16/20 mil	10/14 mil	20/20 mil	15/15 mil
6 oz	22/26 mil	14/16 mil	26/26 mil	20/20 mil
10 oz	36/40 mil	28/34 mil	40/40 mil	32/32 mil
20 oz	74/90 mil	60/80 mil	90/90 mil	70/70 mil

General FR-4 drilling tolerances in the same matrix are ±3 mil for plated-hole diameter and ±2 mil for non-plated-hole diameter under the standard process, with tighter special-process values of ±2 mil and ±1 mil respectively. Outline tolerance is typically ±5 mil. These values are not automatically combinable with maximum copper, maximum thickness, minimum holes, maximum aspect ratio, and maximum board size in one design.

Use our heavy copper PCB design guide as an early reference, then send the actual files for DFM. For current-carrying calculations, IPC-2152 relates conductor size, current and acceptable temperature rise; it does not replace thermal simulation, terminal analysis, or prototype validation for the finished assembly.

Which Via Technologies Are Available?

Through holes, mechanical blind/buried holes, and laser blind/buried vias are listed in our FR-4 capability matrix. The generic matrix shows 0.10 mm laser blind/buried vias, 0.20 mm standard mechanical blind/buried holes, and 0.15 mm special mechanical blind/buried holes.

Plated through holes: standard maximum aspect ratio 8:1; special process up to 10:1.
Mechanical blind/buried holes: 0.20 mm standard and 0.15 mm special-process minimums.
Laser blind/buried vias: 0.10 mm listed capability for suitable HDI constructions.
High-current transitions: multiple parallel vias, larger finished holes, thicker barrel copper, or direct copper structures may be considered after current and thermal review.

These minimums describe the broader FR-4 process range, not a guarantee that microvias can be combined with 20 oz or 100 oz copper. On heavy power layers, larger via structures and generous annular rings are usually more manufacturable. We confirm drill diameter, pad size, finished barrel copper, aspect ratio, and connection pattern together.

Cutaway showing through, blind and buried vias in a multilayer heavy copper PCB

Which Standards and Certifications Apply?

The applicable document set depends on the product class, end market, customer drawing, and purchase specification. A heavy copper board should not be described as “IPC compliant” without naming the exact document, revision, class, and acceptance requirements.

IPC-2152: guidance for determining current-carrying capacity from conductor size and acceptable temperature rise.
IPC-2221 and IPC-2222: generic and rigid-board design requirements.
IPC-6012F: qualification and performance requirements for rigid printed boards.
IPC-A-600: acceptability criteria for printed boards when called out with the applicable performance specification.

EBest Circuit company materials list ISO 9001:2015, ISO 13485:2016, IATF 16949, AS9100D, UL, RoHS and REACH documentation. Certification scope is not identical for every product, manufacturing site, or end use. State your industry and required certificate package in the RFQ so we can confirm the applicable manufacturing route and provide the relevant evidence.

What Determines Typical Lead Time?

Heavy copper lead time is quoted after DFM because the work does not follow one standard prototype schedule. The public EBest Circuit lead-time table directs special boards to contact us for project-specific timing, and that is the correct approach for heavy and extreme copper.

Finished copper weight on every inner and outer layer.
Layer count, board thickness, panel size and copper balance.
Laminate and prepreg availability, including special or halogen-free systems.
Mechanical, blind, buried or laser-via requirements.
Surface finish, selective plating and solder-mask build.
Prototype quantity, production quantity and test-coupon requirements.
DFM clarification cycles and customer approval time.

To shorten the schedule, submit a complete, internally consistent package and approve the proposed stackup before detailed routing is locked. You can review our general PCB lead-time framework, but the written quotation and order acknowledgement govern the actual heavy-copper delivery date.

How Should Engineers Design 100 oz+ PCBs?

A 100 oz+ board must be treated as an extreme copper PCB project, not as a 10 oz layout with every dimension multiplied. One ounce of copper per square foot is approximately 35 µm, so 100 oz represents roughly 3.5 mm of copper before considering dielectric layers, plating, surface finish, and fabrication tolerances.

Define the electrical target. Provide continuous and peak current, duty cycle, allowed voltage drop, ambient conditions, cooling method and maximum temperature rise.
Specify finished copper by layer. State which layers require 100 oz+ and whether the target includes plated build-up. Do not use one global copper note for a mixed construction.
Separate power and signal needs. Keep fine-pitch control circuitry away from the extreme-copper geometry or place it on a separate assembly when practical.
Use broad, simple conductors. Avoid fine neck-downs, dense spacing, small thermal spokes and abrupt current bottlenecks. Exact minimum geometry must come from project DFM.
Minimize layer transitions. Where current must change layers, define the total current path through terminals, copper features and via structures rather than counting vias alone.
Balance the construction. Keep copper mass and coverage as symmetric as possible to reduce lamination and flatness risk.
Reserve mechanical space. Expect larger pads, holes, clearances, edge distances and finished board thickness than a normal PCB.
Freeze the layout after fabricator DFM. We must agree on the manufacturing route, stackup, conductor geometry, tolerances, coupon plan and inspection criteria before release.

These are high current PCB design guidelines, not a released 100 oz design-rule table. EBest Circuit’s controlled FR-4 matrix currently provides numeric line/space rules through 20 oz. Any 100 oz+ geometry remains subject to engineering feasibility, material sourcing, panel constraints, and a written project-specific rule set.

What Should You Send for DFM Review and Quotation?

A complete package lets us distinguish a feasible heavy-copper build from a requirement that needs structural changes. Send the electrical requirements together with the fabrication data, not just Gerber files and a single copper number.

Gerber or ODB++ data, NC drill files, drill table and board outline.
Layer stackup with finished copper weight for every layer.
Finished board thickness, tolerance, dimensions and quantity.
Material family, Tg, CTI, flammability and halogen-free requirements where applicable.
Surface finish, selective plating, exposed copper and edge-contact requirements.
Continuous/peak current, temperature-rise limit, duty cycle and cooling conditions.
Required IPC document, class, test coupons, microsections, electrical test and certificate package.
Prototype target date and production forecast.

Our general PCB capability page provides broader reference data. For a binding decision, the reviewed stackup, DFM response and quotation take priority over standalone website maxima.

Heavy copper PCB and polished cross-section coupon under microscope inspection

FAQ About Heavy Copper PCB

Is 3 oz copper considered heavy copper?

Many PCB manufacturers use 3 oz/ft² as the practical starting point for heavy copper, although there is no single IPC definition that makes the label sufficient for fabrication. Always state the finished copper thickness required on each layer.

Can inner and outer layers use different copper weights?

Yes. Mixed-copper stackups can place heavier copper on power layers and lighter copper on signal layers. The combination must be reviewed for resin fill, copper balance, finished thickness, registration and the line/space required on each layer.

Can heavy copper PCBs use blind or buried vias?

They can in suitable constructions, but the smallest generic FR-4 via capability cannot automatically be combined with the highest copper weight. We review hole type, connection layers, annular ring, dielectric thickness and copper build together.

Does thicker copper always allow more current?

Thicker copper increases conductor cross-section, but current capacity also depends on trace width, temperature-rise limit, adjacent copper, board material, airflow, enclosure, duty cycle, terminals and layer position. Use IPC-2152 as a design reference and validate the complete assembly.

Which finish is best for a heavy copper power board?

There is no universal finish. ENIG is useful where pad flatness matters, HASL is an established solderable option, OSP is simple, and ENEPIG may support selected bonding needs. The assembly process, storage plan, contact wear and selective-plating requirements decide the finish.

Can EBest Circuit make a 100 oz PCB?

We evaluate 100 oz+ requests as extreme-copper projects. Our controlled FR-4 matrix provides standard and special rules through 20 oz, while higher public maxima require project-specific confirmation. Send the stackup, geometry, current target, board size and quantity for a written feasibility decision.

How Can EBest Circuit Support Your Heavy Copper PCB Project?

At EBest Circuit, we support heavy copper PCB stackup review, material selection, DFM, prototype fabrication, production planning, electrical testing and cross-section inspection. We will identify which requirements fit the standard process, which require a special route, and which need redesign before they become cost or reliability problems.

Send your files and operating requirements through our PCB quotation and engineering contact page. For 20 oz, 100 oz+ or mixed-copper multilayer designs, request the project-specific stackup and design rules before final layout release.

What Is a Heavy Copper PCB?

A heavy copper PCB is a printed circuit board built with much thicker copper conductors than a conventional PCB. In the PCB industry, the term usually refers to boards with 3 oz/ft² to 10 oz/ft² copper on the inner layers, outer layers, or both. For more demanding power applications, extreme heavy copper PCB can reach 20 oz/ft² to 200 oz/ft².

These boards are built to handle:

Higher current loads
Better heat transfer
Improved resistance to thermal stress
Longer service life in harsh operating conditions

Compared with standard copper boards, heavy copper PCBs are better suited for power conversion, current distribution, and heat-intensive designs.

Heavy Copper PCB

Why Choose Heavy Copper PCB?

When a design involves high current, high power density, or repeated thermal cycling, standard copper thickness may no longer be enough. Heavy copper PCB provides a more reliable platform for these conditions. Below are the key benefits of using heavy copper PCB:

Higher Current Carrying Capacity

Thicker copper traces can carry more current safely and reduce the risk of overheating.

Better Thermal Management

Heavy copper helps spread and transfer heat more effectively, which supports stable performance in power circuits.

Improved Mechanical Strength

The copper structure adds durability and helps the board withstand demanding operating environments.

Better Reliability in Harsh Conditions

Heavy copper boards perform well in applications exposed to vibration, thermal shock, and continuous electrical load.

Fewer Design Limits for Power Routing

For power electronics, thicker copper offers more flexibility when routing high-current paths.

Heavy Copper PCB

Typical Applications of Heavy Copper PCB

Heavy copper PCBs are widely used in products where electrical load and heat generation are significant.

Common Applications Include:

Power distribution systems
Power converters
Planar transformers
Industrial control equipment
Motor drives
Automotive power electronics
Solar and renewable energy systems
Battery charging and energy storage equipment
Welding equipment
Heat dissipation modules

If your project needs stable current flow and efficient heat handling, heavy copper PCB is often the more suitable choice.

Heavy Copper PCB Design Considerations

Heavy copper board design is different from standard PCB design. Thicker copper affects current capacity, thermal behavior, trace geometry, and manufacturability. A good design should balance electrical performance with production feasibility.

1. Current Carrying Requirements

The minimum conductor width and copper thickness should be based on:

Required current
Acceptable temperature rise
Board layout space
Heat dissipation conditions

Wider traces and thicker copper improve current handling, but they also affect routing density and process difficulty.

2. Copper Profile and Manufacturing Impact

Heavy copper traces may not form a perfect rectangular shape after fabrication. The final conductor profile depends on plating and etching methods. This should be considered in spacing and tolerance planning.

3. Board Thickness

Heavy copper layers can increase total PCB thickness. This may affect:

Mechanical assembly
Connector matching
Drilling process
Stack-up design
Final product dimensions

4. Preferred Fabrication Method

For many heavy copper boards, additive plating processes are preferred over subtractive etching. Additive processing offers better copper build-up control, though it usually increases fabrication cost.

5. Tolerance

Typical tolerance for conductor width, spacing, and thickness is around ±20%, although tighter control may be achievable depending on the board structure and manufacturing process.

Pls visit heavy copper PCB design guide for more information about design guide, or visit heavy copper PCB FAQ to make your heavy copper PCB design meet DFM better.

Our Heavy Copper PCB Capabilities

We support heavy copper PCB manufacturing for a wide range of power and thermal applications.

Item	Capability
Base Material	FR4 / Aluminum
Copper Thickness	4 oz to 10 oz
Extreme Heavy Copper	20 oz to 200 oz
Board Outline	Routing, Punching, V-Cut
Solder Mask Color	White, Black, Blue, Green, Red
Surface Finish	Immersion Gold, HASL, OSP
Max Panel Size	580 × 480 mm (22.8″ × 18.9″)

If your project has special stack-up, thermal, or current requirements, we can review the design and suggest a more manufacturable solution.

How We Support Heavy Copper PCB Projects?

For heavy copper PCB, engineering review is often as important as manufacturing itself. We work with customers on the practical points that affect both performance and yield.

Our support can include:

Copper thickness selection
Trace width and spacing review
Stack-up recommendation
Thermal structure assessment
Panelization suggestion
DFM optimization before production
Process evaluation for extreme heavy copper requirements

Heavy Copper PCB FAQ

1. What copper thickness is considered heavy copper PCB?

In general, heavy copper PCB refers to boards with copper thickness from 3 oz to 10 oz on inner or outer layers. Boards above this range, such as 20 oz to 200 oz, are often called extreme heavy copper PCB.

2. What is the main advantage of heavy copper PCB?

The main advantage is the ability to handle higher current and better heat dissipation compared with standard copper PCBs.

3. Can heavy copper PCB use aluminum base material?

Yes. Heavy copper PCB can be built on FR4 or aluminum base material, depending on the thermal and structural needs of the application.

4. Is heavy copper PCB more difficult to manufacture?

Yes. Thicker copper increases the complexity of plating, etching, drilling, and tolerance control. That is why DFM review is important before production.

5. What industries use heavy copper PCB most often?

Heavy copper PCB is commonly used in industrial control, automotive electronics, renewable energy, power conversion, and power distribution systems.

Request a Quote for Heavy Copper PCB

Looking for a reliable heavy copper PCB manufacturer?

EBest Circuit supports your project from design review to mass production with engineering-driven solutions and stable manufacturing capability.

Send us your Gerber files, stack-up, and technical requirements today.

📧 Email: sales@bestpcbs.com

📞 Tel: +86-755-2909-1601

What Makes a PCB “Heavy Copper”?

A PCB is typically classified as heavy copper when the finished copper thickness on one or more layers exceeds 3 oz/ft² (≈105 µm). Many industrial designs extend well beyond this threshold, reaching 6 oz, 10 oz, or even 20 oz copper, depending on current and thermal requirements.

Unlike standard boards, heavy copper PCBs are not simply “thicker copper versions” of conventional designs. They require dedicated imaging, etching, plating, and lamination strategies to maintain conductor geometry, dielectric integrity, and layer-to-layer registration.

Why Heavy Copper Matters in High-Power Electronics?

As power electronics continue to shrink in size, current density inevitably increases. Heavy copper construction directly addresses this challenge by offering:

Higher current-carrying capacity without excessive temperature rise
Lower conductor resistance, improving energy efficiency
Improved thermal spreading, reducing hot spots
Enhanced mechanical strength, especially around plated through holes and power vias

In applications such as EV power modules, industrial motor drives, and renewable energy converters, heavy copper is often the difference between theoretical performance and field reliability.

Technical Specifications: Copper Weight & Conductivity

Copper thickness is usually specified in ounces per square foot, but its real impact is seen in electrical and thermal performance.

Typical heavy copper parameters include:

Copper thickness: 3 oz to 20+ oz (105 µm to >700 µm)
Trace current capacity: Several times higher than 1-oz copper at equivalent temperature rise
Lower voltage drop: Especially critical for low-voltage, high-current systems
Thermal conductivity: Copper’s intrinsic conductivity enables efficient heat spreading across planes and embedded power structures

A qualified heavy copper PCB manufacturer will validate these parameters against IPC guidelines rather than relying on theoretical calculations alone.

Heavy Copper PCB Manufacturing Challenges

Manufacturing heavy copper PCBs is more complex than standard ones, requiring specialized equipment and strict quality control. Key challenges we address at Best Technology:

Etching Uniformity: Thicker copper is hard to etch evenly, causing uneven traces or undercutting. We use controlled depth etching and precision equipment for consistent, clean traces.
Plating Consistency: Multilayer PCBs need thick, uniform via plating. Our optimized electroplating ensures reliable via connections, avoiding high resistance or thermal failure.
Thermal Stress: Copper and substrates (e.g., FR-4) expand differently under heat, causing warping or delamination. We use temperature-controlled lamination to minimize stress.
IPC-A-610 Compliance: Meeting this standard (trace geometry, plating, solder joints) requires rigorous quality control at every manufacturing stage.

Heavy Copper PCB Manufacturing Challenges

Design Guidelines for Heavy Copper PCB

Heavy copper PCB design should follow one core principle: current-driven, precisely matched copper. Simply increasing copper thickness often raises cost and introduces new risks, including uneven heat dissipation, soldering difficulty, and mechanical stress. Effective heavy copper design balances electrical demand with manufacturability.

1. Copper Thickness Selection

Choose copper thickness based on actual current, not excessive margin.

Formula (ambient ≤ 40 °C):

Allowable current (A) ≈ Copper thickness (oz) × Trace width (mm) × 0.8

For example:

3 oz copper × 3 mm trace ≈ 7.2 A, suitable for most industrial power designs.

Recommendations:

Prefer 3–6 oz, which covers most applications
Above 10 oz increases risks of warpage and drilling difficulty
Avoid overdesign unless required by aerospace or defense systems

2. Trace Design for High Current

Trace geometry must support smooth current flow.

3 oz copper: minimum trace width ≥ 0.3 mm
6 oz copper at 10 A: recommended width ≥ 5 mm

Avoid sudden width changes. Use gradual tapers (length ≥ 3× width difference) to prevent current crowding and localized heating.

For thermal control, use copper pours under power devices combined with thermal vias (Ø 0.8–1.2 mm, pitch 2–3 mm) to transfer heat into internal planes.

3. Via Design Considerations

Vias are a critical limitation point in heavy copper PCBs.

Minimum finished hole ≥ 0.8 mm (3 oz copper)
Via wall copper ≥ 20 µm

Do not rely on a single via for high current. A 5 A path on 3 oz copper typically requires 2–3 parallel vias, as one via carries only 2–3 A reliably.

Ensure adequate solder mask opening (hole + 0.2–0.3 mm) to prevent solder blockage.

4. Stack-Up and Material Selection

Place heavy copper layers on outer or near-outer layers and keep copper distribution symmetrical to prevent warpage.

Select high-Tg materials (Tg ≥ 170 °C), such as FR-4 Tg170 or polyimide, to withstand higher thermal load during assembly and operation.

5. Assembly Adaptation

Heavy copper absorbs more heat during soldering.

Use large power packages (e.g., TO-220, D2PAK)
Enlarge pads by 0.2–0.3 mm compared to standard designs
Increase reflow peak temperature by 5–10 °C and extend soak time by 10–15 s to avoid cold solder joints

Top Industries Using Heavy Copper PCBs

Heavy copper PCBs are widely used in industries that demand power, durability, and reliability:

Power supplies & converters
Electric vehicles (EV) & charging systems
Industrial motor drives
Renewable energy (solar, wind, inverters)
Aerospace & defense electronics
Medical imaging and power modules

These industries rely on certified heavy copper PCB manufacturers to meet strict quality standards.

How to Choose a Heavy Copper PCB Manufacturer?

Choosing the right heavy copper PCB manufacturer is a strategic decision that directly affects product quality and lifecycle cost.

Important evaluation criteria include:

Proven experience with multi-ounce copper designs
Clear alignment with IPC-A-610 and IPC-6012 standards
Robust process control and inspection capability
Engineering support for DFM and design optimization
Ability to scale from prototype to volume production

Manufacturers that lack dedicated heavy copper expertise often struggle with yield, consistency, and long-term reliability.

Why Choose Best Technology as Your Heavy Copper PCB Manufacturer?

With over 20 years of experience in heavy copper PCB manufacturing, Best Technology has the expertise to handle even the most complex projects—from standard heavy copper (3 oz – 5 oz) to extra-thick copper (up to 20 oz). Our team of engineers specializes in solving the unique challenges of heavy copper PCB design and manufacturing.

We offer fully customized heavy copper PCBs to meet your project’s unique requirements. Whether you need a specific copper weight, substrate, surface finish, or board size, we can tailor our solutions to fit your needs.

We deeply know the importance of quality for every product, so we ensure the full traceability from design, manufacturing to shipment. We strictly adhere to IPC-A-610 standards (Class 2 and Class 3) for every heavy copper PCB we manufacture. In addition to this, due to heavy copper PCB always used in electric vehicles, our facility obtained the IATF16949 and AS9100D certifications to ensure each process are under rigorous control.

Heavy Copper PCB Case Studies in Best Technology

Case Study 1: EV Battery Management System (BMS) PCB

Customer: A leading global automotive manufacturer specializing in electric vehicles.

Challenge: The customer needed a heavy copper PCB for their EV BMS that could handle high currents (up to 200A), dissipate heat efficiently, and meet IPC-A-610 Class 3 standards. The PCB also needed to be compact to fit within the EV’s battery pack.

Solution: We designed and manufactured a 6 oz heavy copper PCB using high-temperature FR-4 substrate and ENIG surface finish. We integrated copper pours and thermal vias to improve thermal management, and optimized the trace width and spacing to handle the high current load. We also used blind vias to save space, ensuring the PCB fit within the customer’s compact design.

Result: The PCB met all IPC-A-610 Class 3 requirements, handled the 200A current load without overheating, and reduced the BMS’s overall size by 15%. The customer has since expanded their partnership with us for all their EV BMS PCB needs.

Heavy Copper PCB Case Studies in Best Technology

Case Study 2: Solar Inverter PCB

Customer: A renewable energy company specializing in solar inverters.

Challenge: The customer needed a heavy copper PCB for their 50kW solar inverter that could handle high voltages (up to 1000V) and dissipate heat in outdoor environments. The PCB also needed to be durable enough to withstand extreme temperature fluctuations (-40°C to 85°C).

Solution: We manufactured a 10 oz heavy copper PCB using polyimide substrate (for high-temperature resistance) and immersion silver surface finish (for excellent conductivity). We designed the PCB with wide traces (0.030 inches) to handle the high voltage and current, and integrated large copper pours to dissipate heat. We also used a conformal coating to protect the PCB from outdoor elements.

Result: The PCB operated reliably in extreme temperature conditions, handled the 1000V voltage load without failure, and reduced the inverter’s heat-related downtime by 80%. The customer reported a 20% increase in inverter efficiency due to the PCB’s superior thermal management.

Our Heavy Copper PCB Manufacturing Capabilities

At Best Technology, we have the capabilities to handle all your heavy copper PCB needs—from prototype to production. Here’s a breakdown of our key manufacturing capabilities:

Base Material: FR4/Aluminum
Copper Weight: 3 oz – 20 oz (105 μm – 700 μm) for single-sided, double-sided, and multilayer PCBs.
Extreme Heavy Copper: 20-200OZ
Outline: Routing, punching, V-cut
Layer Count: 1 layer – 40 layers (multilayer heavy copper PCBs with blind/buried vias available).
Surface Finishes: HASL, ENIG, OSP, Immersion gold
Solder Mask: White, Black, Blue, Green, Red
Tolerances: Trace width tolerance ±0.001 inches, copper thickness tolerance ±10%, board thickness tolerance ±0.005 inches.
Board Size: Up to 24 inches x 36 inches (609.6 mm x 914.4 mm), with custom sizes available.
Quality Control: X-ray inspection, optical inspection (AOI), flying probe testing, thermal cycling testing, and IPC-A-610 compliance testing.
Production Capacity: Prototype runs (1 – 100 units), small batch production (100 – 1000 units), and large-scale production (1000+ units) with lead times as short as 3 days for prototypes.
Support for prototypes, small batches, and stable mass production

FAQs About Heavy Copper PCBs

1. When should I choose a heavy copper PCB over a standard PCB?

Choose a heavy copper PCB if your project requires:

High current carrying capacity (more than 10A).
Enhanced thermal management (e.g., applications operating at high temperatures or generating significant heat).
Greater mechanical strength (e.g., rugged industrial or automotive applications).
Reduced component count (replacing discrete heat sinks or bus bars).

Standard PCBs are sufficient for low-power applications (e.g., consumer electronics with low current demands).

2. How is heavy copper PCB manufacturing different from standard PCB manufacturing?

Heavy copper PCB manufacturing requires specialized processes to handle the thicker copper layers, including:

Controlled depth etching to ensure uniform trace widths and clean edges.
Optimized electroplating processes to ensure consistent via plating thickness.
Temperature-controlled lamination to minimize thermal stress and prevent warping/delamination.
Rigorous quality control to meet IPC-A-610 standards, including X-ray inspection for via integrity.

Standard PCB manufacturing uses simpler etching and plating processes, as the thinner copper layers are easier to handle.

3. Are heavy copper PCBs more expensive?

Yes, heavy copper PCBs are typically more expensive than standard PCBs. The higher cost is due to:

More copper material (thicker layers require more copper).
Specialized manufacturing processes (e.g., controlled etching, optimized plating).
Rigorous quality control (e.g., X-ray inspection, thermal testing).

However, the extra cost is often offset by the benefits: reduced component count, longer lifespan, improved reliability, and lower maintenance costs. For high-power applications, heavy copper PCBs are a cost-effective long-term investment.

4. How does copper thickness influence current carrying capacity?

Copper thickness has a direct impact on current carrying capacity: thicker copper layers have lower electrical resistance, allowing them to carry more current without overheating. As a general rule, the current carrying capacity of a copper trace increases linearly with copper thickness. For example:

1 oz copper trace (35 μm): ~5A current carrying capacity (at 25°C temperature rise).
3 oz copper trace (105 μm): ~15A current carrying capacity (at 25°C temperature rise).
10 oz copper trace (350 μm): ~50A current carrying capacity (at 25°C temperature rise).

A reputable heavy copper PCB manufacturer will help you select the right copper thickness based on your project’s current requirements and thermal constraints.

5. Can heavy copper PCBs be multilayered?

Yes, heavy copper PCBs can be multilayered. Multilayer heavy copper PCBs are used in high-power applications that require both high current carrying capacity and complex circuitry (e.g., EV BMS, solar inverters, aerospace systems). We specialize in manufacturing multilayer heavy copper PCBs with up to 40 layers, including blind and buried vias to save space and improve signal integrity.

6. How to avoid heat-related failures in heavy copper PCBs?

To avoid heat-related failures, follow these best practices:

Use thick copper layers (3 oz or more) to dissipate heat efficiently.
Integrate thermal management features like copper pours, thermal vias, and heat sinks.
Choose a high-temperature substrate (e.g., polyimide) for applications operating at extreme temperatures.
Optimize trace design (wider traces) to reduce resistance and heat generation.
Work with a heavy copper PCB manufacturer that adheres to IPC-A-610 standards, ensuring proper plating and trace integrity.

Ready to Start Your Heavy Copper PCB Project?

If you’re working on a high-power electronics project that requires premium heavy copper PCBs—ones that meet IPC-A-610 standards, deliver superior performance, and fit your budget—look no further than Best Technology. As a trusted heavy copper PCB manufacturer with over 20 years of experience, we have the expertise, equipment, and dedication to bring your project to life.

Here’s how to get started:

1. Share Your Requirements: Send us your PCB design files, copper weight needs, substrate preferences, and application details.

2. Get a Custom Quote: Our team will review your requirements and provide a competitive, no-obligation quote within 24 hours.

3. Design Support (If Needed): Our engineers will work with you to optimize your design for performance, manufacturability, and cost.

4. Manufacturing & Delivery: We’ll manufacture your heavy copper PCBs to IPC-A-610 standards, conduct rigorous quality control, and deliver them on time—whether you need prototypes or large-scale production.

Don’t settle for subpar heavy copper PCBs that put your project at risk. Choose Best Technology—the premium heavy copper PCB manufacturer that delivers reliability, performance, and peace of mind. Contact us today to discuss your heavy copper PCB project!

What is high copper thickness PCB?

High copper thickness PCB refers to a printed circuit board that uses thicker copper foil as the conductive material. In the standard PCB manufacturing process, the thickness of the copper foil is usually determined according to the application requirements, but when the thickness of the copper foil is greater than or equal to 3 ounces, this PCB is called a high copper thickness PCB.

Usually compatible with FR-4 dielectric, mainly used for inner layers rather than outer layers, plated through holes (PTH) usually need to be plugged/filled, and careful registration and lamination are required

Common heavy copper PCB thickness:

2 oz (70 microns)
3 oz (105 microns)
4 oz (140 microns)
6 oz (210 microns)
8 oz (280 microns)
10 oz (350 microns)

Application areas of heavy copper PCB:

Automotive electronics: widely used in key electronic devices such as automotive control modules, engine control systems, airbags, etc., because they can withstand high temperature, low temperature, corrosion and other environmental factors.

Power circuit: widely used in power modules, DC-DC converters and high power distribution boards, etc., capable of handling high current and high power requirements.

Industrial control system: used in high power motor drives, automation equipment and large mechanical control to meet the needs of high conductivity and mechanical strength.

Renewable energy systems: used in solar and wind energy systems to ensure stable system operation and reduce failure rates.

What are the advantages of heavy copper PCBs?

High conductivity: High copper PCB uses heavy copper foil as the conductive layer. Compared with ordinary PCB, its conductivity is significantly improved, which can carry larger current, reduce resistance loss and improve circuit efficiency.

High mechanical strength: Due to the increase in the thickness of copper foil, the mechanical strength of high copper PCB is also improved accordingly, which can withstand greater mechanical stress and impact, and is not easy to deform or damage.

Good heat dissipation performance: High copper PCB can quickly transfer heat from the circuit to the surrounding environment, effectively prevent components from overheating and damage, and improve the reliability and service life of the equipment.

What type of copper is PCB?

There are mainly the following types of copper on PCB: red copper, copper clad plate and inner layer copper.

Red copper: Red copper is the earliest material used in circuit boards, and is widely used due to its good processing performance and conductivity. The main component of red copper is copper, and the other components are less, but the disadvantage is that it is easily oxidized and corroded.

Copper clad laminate: Copper clad laminate is a layer of copper foil on an inorganic substrate, usually used for double-sided and multi-layer circuit boards. The copper foil ensures the conductivity and connectivity of the circuit board, while the inorganic substrate provides mechanical strength and heat resistance.

Inner copper: Inner copper is used in multi-layer circuit boards, which are made of multiple layers of inorganic substrate and copper foil. It is usually used in high-density or high-speed design circuit boards, with better signal transmission performance and higher mechanical strength, but the manufacturing cost is higher.

In addition, there are different types of copper foil in PCB, including electrodeposited copper and rolled copper. Electrodeposited copper has a vertical grain structure and a rougher surface, which is suitable for rigid PCB boards; while rolled copper has a horizontal grain structure and a smoother surface, which is suitable for flexible and high-speed circuit boards.

How thick is 2 oz copper on PCB?

The thickness of 2 oz copper is about 70 microns. In PCB design, copper thickness is usually expressed in ounces (oz), and the thickness of 1 ounce of copper is about 35 microns, so the thickness of 2 ounces of copper is about 70 microns.

The copper thickness standard of PCB board is usually expressed in oz/ft² (ounces/square foot) or um (micrometer). The copper thickness of PCB board has an important impact on the performance and stability of the circuit board. The outer copper thickness mainly affects the stability of signal transmission and the ability to resist electromagnetic interference, while the inner copper thickness affects the signal transmission rate and signal-to-noise ratio.

Generally speaking, the thicker the outer copper thickness, the stronger the stability and signal strength of the circuit board, which is suitable for high-frequency and high-speed occasions; while the thinner the inner copper thickness, the more suitable for high-speed transmission signals, and the thicker the inner copper thickness, the more suitable for low-speed transmission signals and high signal-to-noise ratio signals.

Why use heavy copper PCB?

The main reasons for using heavy copper PCB include the following aspects:

Enhanced current carrying capacity: Heavy copper PCB uses a thicker copper layer, which can carry a larger current and reduce resistance and voltage drop. This is especially important for high-power applications or circuits that require high current transmission.

Optimize heat dissipation performance: Copper has good thermal conductivity, and a thicker copper layer can more effectively conduct heat away from hot spots and improve heat dissipation efficiency.

Improve signal transmission efficiency: Thicker copper layers can reduce losses and reflections during signal transmission and improve signal integrity.

Enhance mechanical strength: Thicker copper layers can increase the overall structural strength of PCBs, making them more resistant to physical shock and deformation.

Adapt to complex process requirements: Heavy copper PCBs can meet complex circuit design requirements through special process treatments, such as etching, drilling, gold plating, etc., to ensure the accuracy and reliability of circuit boards during manufacturing.

What is the most common copper thickness for PCB?

The most common PCB copper foil thickness is 35 microns. This thickness of copper foil is suitable for most consumer electronics products, can meet daily current and heat requirements, and has a relatively low cost and is suitable for large-scale production.

How are heavy copper PCBs made?

In the initial stage of making heavy copper PCBs, relatively heavy copper foil materials are selected. These copper foils are usually produced by electrolytic copper. During the electrolysis process, copper foils of different thicknesses can be produced by controlling the conditions of electrolysis, such as current density, electrolyte composition, and electrolysis time.

For situations where thicker copper foil is required, multiple lamination methods are used. Multiple layers of copper foil and insulating substrate materials are laminated according to design requirements, and then the copper foil and substrate are tightly combined through a high-temperature, high-pressure lamination process.

Next, the circuit pattern is manufactured on the outer layer of the heavy copper PCB, usually using a photolithography process. After that, according to the design requirements, holes are drilled on the heavy copper PCB to provide conditions for installing components and connecting circuits.

After the drilling is completed, a metal layer is covered on the hole wall using electroplating technology to achieve a connection between the layers, and a layer of copper foil is electroplated on the hole wall to increase the thickness of the conductor and the surface pad. Next, the dry film and excess copper foil are removed, and chemical etchants are generally used to make the circuit pattern clearer.

Subsequently, the heavy copper PCB is subjected to surface treatment, such as gold plating, tin spraying, etc., to improve welding performance and corrosion resistance. Finally, the finished heavy copper PCB is strictly inspected and tested to ensure that its electrical and mechanical properties are consistent with the design requirements.

Professional Heavy copper PCB manufacturers – BEST Technology

The minimum width and thickness of the heavy copper PCB conductor are mainly determined based on the required current carrying capacity and the maximum temperature rise allowed for the conductor. From the perspective of its size specifications and actual manufacturing process, the routing of the circuit board may not be a regular rectangular shape.

It is worth noting that the thicker copper conductor will significantly increase the overall thickness of the circuit board to a large extent. In terms of manufacturing process, the additive method (electroplating) process has certain advantages over the subtractive method (etching) process, but at the same time, its cost is relatively higher.

BEST Technology process capabilities:

Substrate: FR4/Aluminum

Copper thickness: 4OZ~10OZ

Extremely heavy copper thickness: 20~200 OZ

Contour: Milling, Punching, V-Cut

Solder mask: White oil/Black oil/Blue oil/Green oil/Red oil

Surface treatment: Immersion gold, tin spraying, OSP

Maximum panel size: 580*480mm(22.8″*18.9″)

Heavy copper PCB occupies an important position in the electronics field with its unique characteristics. With high current carrying capacity, good heat dissipation performance, higher mechanical strength and excellent reliability, it has become an ideal choice for many high-demand application scenarios. From power electronics to automotive electronics, from aerospace to medical equipment and communications, heavy copper PCB plays a key role.

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Heavy copper PCB manufacturer

What Maximum Copper Thickness Can Be Achieved for Heavy Copper PCBs?

What Heavy Copper PCB Stack-Up Configurations Are Available?

Which Materials and Prepreg Systems Are Used for Heavy Copper PCBs?

What Surface Finish Options Are Available for Heavy Copper PCBs?

What Are the Design Rules and Manufacturing Tolerances for Heavy Copper PCBs?

Which Via Technologies Are Available for Heavy Copper PCB Manufacturing?

Which Standards and Certifications Apply to Heavy Copper PCBs?

What Is the Typical Lead Time for Heavy Copper PCB Production?

What Design Guidelines Should Be Followed for 100 oz+ Heavy Copper PCBs?

Why Choose EBest Circuit for Heavy Copper PCB Manufacturing?

Frequently Asked Questions About Heavy Copper PCBs

Request a Heavy Copper PCB Manufacturing Review

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Heavy Copper PCB Case Studies in Best Technology

Our Heavy Copper PCB Manufacturing Capabilities

FAQs About Heavy Copper PCBs

Ready to Start Your Heavy Copper PCB Project?

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What is high copper thickness PCB?

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Professional Heavy copper PCB manufacturers – BEST Technology

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