[{"data":1,"prerenderedAt":487},["ShallowReactive",2],{"resources-index":3,"header-nav-en":5,"capability-heavy-copper-pcb-en":329},{"downloads":4},[],{"pcbManufacturingColumns":6,"capabilityColumns":131,"resourceColumns":162,"pcbaColumns":204},[7,55,84,113],{"heading":8,"links":9},"PCB Product Families",[10,13,16,19,22,25,28,31,34,37,40,43,46,49,52],{"label":11,"path":12},"FR-4 PCB","/pcb/fr4-pcb",{"label":14,"path":15},"High-Speed PCB","/pcb/high-speed-pcb",{"label":17,"path":18},"Multilayer PCB","/pcb/multilayer-pcb",{"label":20,"path":21},"HDI PCB","/pcb/hdi-pcb",{"label":23,"path":24},"Flexible PCB","/pcb/flex-pcb",{"label":26,"path":27},"Rigid Flex PCB","/pcb/rigid-flex-pcb",{"label":29,"path":30},"Ceramic PCB","/pcb/ceramic-pcb",{"label":32,"path":33},"Heavy Copper PCB","/pcb/heavy-copper-pcb",{"label":35,"path":36},"High Thermal PCB","/pcb/high-thermal-pcb",{"label":38,"path":39},"Antenna PCB","/pcb/antenna-pcb",{"label":41,"path":42},"High Frequency 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Equipment","/industries/security-equipment-pcb",{"label":327,"path":328},"PCB Industry Overview →","/pcb-industry-solutions",{"payload":330,"localeUsed":384},{"slug":331,"hero":332,"trustBar":345,"seo":376,"breadcrumbs":436,"sections":443,"closingCta":474,"faqs":481},"heavy-copper-pcb",{"eyebrow":333,"title":334,"description":335,"highlights":336,"image":342},"High-Current & Power Electronics","Heavy Copper PCB Manufacturer | 3 oz to 10 oz Extreme Tolerances","Engineering-grade heavy copper PCB manufacturing engineered for severe electrical currents, high-temperature thermal dissipation, and harsh environmental stress. APTPCB specializes in 3 oz to 10 oz thick copper boards with controlled differential etching, high-dielectric resin filling, and IPC-6012 Class 3 reliability for aerospace, EV powertrains, and industrial power distribution.",[337,338,339,340,341],"Copper foil weights from 3 oz/ft² up to 10 oz/ft² (105 µm to 350 µm)","High thermal conductivity dielectric gap filling (up to 3.0 W/m·K)","Differential inner/outer layer copper thickness integration","IPC-6012 Class 3 / Class 3A military and avionics qualification","High-current busbar replacement and thermal microsection testing",{"src":343,"alt":344},"/assets/img/capabilities/heavy-copper-pcb-hero.webp","Multi-layer heavy copper PCB cross section showing thick copper traces and void-free resin fill",[346,349,352,355,358,361,364,367,370,373],{"label":347,"value":348},"Finished Copper","3 oz to 10 oz (105–350 µm)",{"label":350,"value":351},"Current Capacity","Up to 120A Continuous",{"label":353,"value":354},"Layer Count","2 to 16 Layers",{"label":356,"value":357},"Dielectric Withstand","> 3000 V AC Hi-Pot",{"label":359,"value":360},"Thermal Conductivity","1.0 to 3.0 W/m·K",{"label":362,"value":363},"Workmanship Class","IPC-6012 Class 3 / 3A",{"label":365,"value":366},"Min Trace / Space","10 / 10 mil @ 3 oz; 18 / 18 mil @ 6 oz",{"label":368,"value":369},"Surface Finishes","ENIG (3–5 µ\" Au), Immersion Silver, HASL",{"label":371,"value":372},"Solder Mask","Multi-Pass High-Build Liquid Photoimageable",{"label":374,"value":375},"Testing Verification","100% Netlist E-Test & Thermal Stress Coupons",{"title":377,"description":378,"canonical":379,"structuredData":380},"Heavy Copper PCB Manufacturer | Power Circuit Boards | APTPCB","Heavy copper PCB manufacturer specializing in 3 oz to 10 oz extreme power boards. Differential etching, void-free resin fill, and IPC-6012 Class 3 qualification.","https://aptpcb.com/en/capabilities/heavy-copper-pcb",[381,389,396,410],{"@context":382,"@type":383,"name":377,"url":379,"description":378,"inLanguage":384,"isPartOf":385},"https://schema.org","WebPage","en",{"@type":386,"name":387,"url":388},"WebSite","APTPCB","https://aptpcb.com/",{"@context":382,"@type":390,"name":391,"serviceType":392,"description":393,"provider":394,"url":379},"Service","Heavy Copper PCB Manufacturing Services","Heavy Copper and Extreme Current PCB Fabrication","Precision multi-layer heavy copper PCB fabrication from 3 oz to 10 oz copper foil. Differential etching, void-free prepreg lamination, and thermal stress verification for high-power electronics.",{"@type":395,"name":387,"url":388},"Organization",{"@context":382,"@type":397,"itemListElement":398},"BreadcrumbList",[399,404,408],{"@type":400,"position":401,"name":402,"item":403},"ListItem",1,"Home","https://aptpcb.com/en/",{"@type":400,"position":405,"name":406,"item":407},2,"Capabilities","https://aptpcb.com/en/capabilities",{"@type":400,"position":409,"name":32,"item":379},3,{"@context":382,"@type":411,"name":412,"url":379,"mainEntity":413},"FAQPage","Frequently Asked Questions About Heavy Copper PCBs",[414,420,424,428,432],{"@type":415,"name":416,"acceptedAnswer":417},"Question","What defines a Heavy Copper PCB compared to a standard printed circuit board?",{"@type":418,"text":419},"Answer","A heavy copper PCB is formally classified as any printed circuit board manufactured with 3 oz/ft² (105 µm) or more of finished copper on either inner or outer layers. While standard commercial PCBs utilize 0.5 oz to 1 oz copper (18–35 µm), heavy copper boards can carry continuous currents of 50A to 120A+ and operate at elevated temperatures without thermal runaway.",{"@type":415,"name":421,"acceptedAnswer":422},"What is the maximum copper weight APTPCB can manufacture?",{"@type":418,"text":423},"APTPCB manufactures up to 10 oz/ft² (350 µm) finished copper on multi-layer boards (up to 16 layers), and up to 20 oz/ft² (700 µm) on specialized single/double-sided power distribution panels. We also support hybrid differential stackups combining heavy copper power planes with standard 1 oz signal layers.",{"@type":415,"name":425,"acceptedAnswer":426},"How do you prevent voids and delamination between thick copper traces during lamination?",{"@type":418,"text":427},"We use high-flow, high-resin prepregs combined with optimized hydraulic vacuum press cycles. The resin content is precisely calculated against the copper pattern density to ensure every inter-trace trough is 100% encapsulated with void-free dielectric resin before curing, verified via metallurgical microsection cut inspection.",{"@type":415,"name":429,"acceptedAnswer":430},"What are the common applications for heavy copper circuit boards?",{"@type":418,"text":431},"Heavy copper PCBs are standard in automotive EV battery management systems (BMS), power converters, industrial motor drives, solar inverters, military radar power supplies, aviation distribution panels, and high-current welding machinery where high reliability and compact thermal management are non-negotiable.",{"@type":415,"name":433,"acceptedAnswer":434},"Can heavy copper PCBs be assembled with standard SMT components?",{"@type":418,"text":435},"Yes, but they require careful thermal profiling due to their high thermal mass. APTPCB's PCBA facility utilizes 10-zone reflow ovens with nitrogen atmospheres and programmable selective soldering systems to ensure full solder wetting and barrel fill on heavy through-hole pins without damaging adjacent heat-sensitive surface mount components.",[437,439,441],{"label":402,"to":438},"/en/",{"label":406,"to":440},"/en/capabilities",{"label":32,"to":442},"/en/capabilities/heavy-copper-pcb",[444,454,464],{"id":445,"title":446,"eyebrow":447,"content":448,"features":449},"thermal-management-architecture","Thermal Management & High-Current Distribution Architecture","Power Engineering","\u003Cp>Heavy copper circuit boards (defined as boards with outer or inner layer finished copper thickness $\\ge$ 3 oz/ft² or 105 µm) replace bulky external wiring harnesses and separate copper busbars with compact, planar conductor tracks integrated directly into the printed circuit substrate.\u003C/p>\u003Cp>By conducting continuous currents exceeding 100 Amperes and dissipating concentrated heat flux away from high-power MOSFETs, IGBT modules, and DC-DC converters, heavy copper PCBs drastically reduce thermal resistance, decrease system weight, and eliminate mechanical interconnect failures in electric vehicles, military radar power supplies, and industrial inverter drives.\u003C/p>\u003Cp>For extreme heat dissipation requirements, APTPCB frequently combines heavy copper inner planes with \u003Ca href=\"/capabilities/metal-pcb\">metal core PCB (MCPCB)\u003C/a> substrates or localized embedded copper heat sinks to achieve unmatched thermal performance.\u003C/p>\u003Cp>Because thick copper planes absorb substantial soldering heat, through-hole power connectors require specialized \u003Ca href=\"/pcba/pcb-selective-soldering\">thick copper selective soldering and THT assembly\u003C/a> with multi-stage preheating to guarantee 75% vertical barrel fill complying with IPC-A-610 Class 3.\u003C/p>",[450,451,452,453],"Planar integration of high-current power buses and low-signal control lines on one board","Substantial reduction in $I^2R$ resistive heating and voltage drops across power planes","Direct thermal dissipation from power component packages to outer heat sink interfaces","Elimination of fragile busbar bolt connections, soldering lugs, and discrete wiring harness joints",{"id":455,"title":456,"eyebrow":457,"content":458,"features":459},"etching-lamination-process","Differential Etching & High-Resin Prepreg Lamination Control","Manufacturing Process","\u003Cp>Fabricating heavy copper printed circuits requires specialized chemistry and lamination controls that far exceed standard PCB processing. Standard chemical etching will undercut thick copper tracks, eroding conductor cross-sections and compromising spacing tolerances.\u003C/p>\u003Cp>APTPCB implements specialized multi-stage differential spray etching with customized compensation factors (etch factor > 3.0), preserving straight, vertical conductor sidewalls even on 6 oz to 10 oz copper layers. To prevent lamination voids between massive copper tracks, we utilize high-resin content prepregs (e.g., 1080/106 high-flow epoxy systems) and controlled vacuum press cycles that ensure complete resin encapsulation without micro-voids, delamination, or insulation breakdown.\u003C/p>",[460,461,462,463],"Proprietary etching compensation software calculating accurate trace width offsets for 3–10 oz copper","High-resin prepreg combinations providing 100% void-free planarization between heavy tracks","Multi-step solder mask printing (liquid photoimageable coating applied in 2–3 passes) for complete conductor edge coverage","Thermal stress microsection testing at 288°C for 10 seconds to verify zero barrel cracking or pad lifting",{"id":465,"title":466,"eyebrow":467,"content":468,"features":469},"design-rules-guidelines","Heavy Copper PCB Design Rules & Trace/Space Guidelines","DFM Rules","\u003Cp>Design for Manufacturability (DFM) is paramount when routing thick copper boards. Because copper thickness expands both vertically and laterally during etching, trace-to-trace spacing must scale proportionally with copper weight to allow sufficient chemical flow and resin filling:\u003C/p>\u003Cul>\u003Cli>\u003Cstrong>3 oz Copper (105 µm):\u003C/strong> Minimum trace width 10 mil (0.25 mm), minimum space 10 mil (0.25 mm).\u003C/li>\u003Cli>\u003Cstrong>4 oz Copper (140 µm):\u003C/strong> Minimum trace width 12 mil (0.30 mm), minimum space 12 mil (0.30 mm).\u003C/li>\u003Cli>\u003Cstrong>6 oz Copper (210 µm):\u003C/strong> Minimum trace width 16 mil (0.40 mm), minimum space 16 mil (0.40 mm).\u003C/li>\u003Cli>\u003Cstrong>8 oz to 10 oz Copper (280–350 µm):\u003C/strong> Minimum trace width 22 mil (0.55 mm), minimum space 24 mil (0.60 mm).\u003C/li>\u003C/ul>\u003Cp>Our engineering team performs a complimentary 24-hour DFM analysis on your Gerber or ODB++ files before order release to optimize thermal pad geometries, solder mask dams, and drill-to-copper clearances.\u003C/p>",[470,471,472,473],"Clearance rules calibrated to avoid acid traps, incomplete etching, and solder mask skips","Thermal relief pad geometry optimization to facilitate reliable wave and selective soldering","Complimentary DFM review providing detailed stackup calculations and copper weight optimization","Full support for selective thick copper (e.g., 4 oz on outer power rails, 1 oz on internal control signals)",{"title":475,"description":476,"variant":477,"secondary":478},"Ready to Build Your Heavy Copper Power Circuit Board?","Upload your Gerber data and stackup requirements for a comprehensive engineering review and quotation within 24 hours.","primary",{"label":479,"to":480},"Speak with a Heavy Copper Engineer","/en/contact",[482,483,484,485,486],{"question":416,"answer":419,"q":416,"a":419},{"question":421,"answer":423,"q":421,"a":423},{"question":425,"answer":427,"q":425,"a":427},{"question":429,"answer":431,"q":429,"a":431},{"question":433,"answer":435,"q":433,"a":435},1790033368690]