Product Matrix
Precision Heavy Copper & Electronics Solutions
Explore our turnkey fabrication lineup supporting extreme current loads, high dissipation, and micro-signal integration.
Engineering Authority
Heavy Copper PCB Engineering Architecture: Current Density & Heat Sinks
A rigorous review of structural thermal dissipation, copper barrel plating thickness, and differential trace etching.
Thermal Dissipation & High-Current Ampacity
Heavy copper PCBs (defined as containing 3 oz/ft² to over 10 oz/ft² of finished copper) eliminate the failure points associated with bus bars and discrete heavy wiring harnesses. By leveraging thick planar copper conductors, thermal energy generated by high-power switches (IGBTs, GaN, and SiC MOSFETs) conducts directly across the horizontal layer plane and vertically through copper-filled thermal via arrays. This delivers immediate drops in junction temperature (Tj) and guarantees reliable power transmission exceeding 60 Amperes continuous without substrate degradation.
Differential Etching & Resin Fill Dynamics
Fabricating circuits with copper exceeding 105 µm (3 oz) introduces major challenges in etch undercut and resin flow. At our facilities, specialized multi-stage differential alkaline and cupric chloride etching chemistries are calibrated to preserve a strict etch factor ratio (≥ 3:1). Furthermore, during multilayer lamination, heavy copper voids demand formulated high-flow, high-Tg prepregs (such as Shengyi S1000-2M or Iola 370HR) combined with vacuum pressure profiling to avert resin starvation, micro-voiding, and delamination during high-temperature reflow.
IPC Class 3 & Plating Reliability
Through-hole reliability in high-current environments is governed by hole barrel plating integrity. Standard commercial boards plate 20–25 µm of copper in via barrels; our extreme heavy copper builds mandate a minimum continuous plating thickness of ≥ 35 µm (IPC Class 3 requirement). This eliminates barrel cracking induced by Z-axis thermal expansion under repetitive thermal shock cycles (-40°C to +125°C), crucial for mission-critical medical hardware and power inversion infrastructure installed in harsh environments.
Factory Capabilities
Heavy Copper Technical Capabilities Matrix
Engineered parameters for power distribution boards, automotive controllers, and high-frequency systems.
| Technical Parameter | Standard Capability | Advanced / Heavy Copper Option | Verification / Testing Method |
|---|---|---|---|
| Outer Layer Copper Weight | 1 oz to 3 oz (35 µm – 105 µm) | 4 oz to 14 oz (140 µm – 490 µm) | Microsection Analysis & Eddy Current |
| Inner Layer Copper Weight | 1 oz to 2.5 oz | 3 oz to 10 oz (105 µm – 350 µm) | X-Ray Thickness Gauge & Metallography |
| Dielectric Core & Prepreg | Standard FR4 (Tg 135°C–150°C) | High-Tg FR4 (≥ 170°C–180°C), Polyimide | DSC (Differential Scanning Calorimetry) |
| Minimum Trace / Space (Outer, 4 oz) | 8 mil / 8 mil (0.20 mm / 0.20 mm) | 10 mil / 10 mil (0.25 mm / 0.25 mm) | AOI (Automated Optical Inspection) |
| PTH Barrel Copper Plating | 20 µm – 25 µm (IPC Class 2) | ≥ 35 µm – 50 µm (IPC Class 3/A) | Cross-section Plating Thickness Testing |
| Surface Finishes | HASL, Lead-Free HASL | ENIG (Au: 1-3 µ", Ni: 120-240 µ"), ENEPIG, Immersion Ag | XRF Plating Thickness & Solderability |
| Breakdown Voltage Isolation | 500 V DC | Up to 3.5 kV AC / 5 kV DC Isolation | Hi-Pot (Dielectric Withstanding Voltage) |
Costa Rica Industrial Focus
Localized Applications & Manufacturing Ecosystem in Cartago
Accelerating production cycles for OEMs located in Cartago’s premier technological free trade zones.
Life Sciences & MedTech Integration
Cartago, Costa Rica, particularly within the Zona Franca La Lima and adjacent technology campuses, has consolidated its position as Central America’s premier hub for life sciences and medical device design. High-reliability electromedical equipment—such as surgical RF generators, dialysis power units, and laser therapy systems—demands heavy copper boards that isolate high voltage surges while actively dissipating localized heat away from critical microcontroller ICs. Our ISO 13485-aligned manufacturing practices ensure full material traceability and biocompatible cleaning verification.
Renewable Energy & Smart Grid Infrastructure
Costa Rica generates over 98% of its electricity from renewable resources (hydroelectric, geothermal, and wind power). Cartago's industrial automation clusters lead development in grid power conversion, bidirectional EV (electric vehicle) charging infrastructure, and smart solar inverters. Implementing 6 oz to 10 oz heavy copper substrates on these boards minimizes internal resistive I²R heat losses, boosting overall power inverter conversion efficiency past 98.5% and maintaining thermal stability in tropical conditions.
Nearshoring Velocity & Duty-Free Logistical Integration
As multinational engineering firms implement "China+1" and dual-sourcing strategies, sourcing high-spec electronic components through verified partners who understand free-zone customs handling is imperative. We provide direct DFM reviews within 24 hours, seamless air freight delivery straight to Juan Santamaría International Airport (SJO) clearing into Cartago Free Zones under specialized industrial regimes, backed by Trade Assurance guarantees and rapid prototyping turnarounds.
Procurement Guidance
Frequently Asked Questions: Heavy Copper Sourcing in Cartago
Direct answers to technical, logistical, and commercial inquiries common among Cartago engineering teams.
What design rules must be adjusted when increasing copper weight to 4 oz or higher?
When transitioning from standard 1 oz to 4 oz or above, trace spacing and trace width tolerances must be widened to allow for chemical etch undercut. We recommend a minimum trace-to-trace distance of 10 mil (0.25 mm) for 4 oz, scaling up to 15 mil (0.38 mm) for 6–8 oz copper. Additionally, via drill sizes must account for heavy barrel plating (≥ 35 µm), ensuring the finished hole diameter aligns precisely with your component lead dimensions.
How do you ensure proper solder mask adhesion on extra-thick copper traces?
Thick copper tracks create deep vertical sidewalls that can cause pooling or thinning of standard liquid photo-imageable (LPI) solder masks. We utilize electrostatically sprayed or double-coat curtain-coated high-solids solder masks, or specialized dry film solder masks, followed by calibrated thermal curing. This process guarantees a minimum of 0.7 mil (18 µm) mask thickness over conductor corners, preventing dielectric breakdown, oxidation, and solder bridging.
What documentation is required for rapid DFM evaluation and quote turnaround?
For custom bare board fabrication, please supply Gerber RS-274X or ODB++ files along with NC drill files, fabrication drawing specifying target copper thickness (base vs. finished), layer stackup, substrate type (e.g., High-Tg FR4), surface finish (ENIG, HASL), and panelization layout. If full PCBA turnkey assembly is required, include an unambiguous Bill of Materials (BOM) with Manufacturer Part Numbers (MPN) and centroid/pick-and-place XY data.
What are the typical lead times and customs handling for shipments to Cartago Free Zones?
Quick-turn heavy copper prototypes typically ship within 5 to 8 working days following engineering DFM clearance. Standard production volumes take 12 to 18 business days. International express transit (via DHL, FedEx, or UPS Priority) to Costa Rica averages 3 to 5 business days. Commercial invoices, certificates of origin, and compliance datasheets (UL 94V-0, RoHS, REACH) are aligned with Costa Rican PROCOMER / Free Trade Zone customs import protocols.
Enterprise Credentials
Why International Engineers Choose Our Shenzhen-to-Cartago Supply Chain
Seamlessly bridging Shenzhen’s comprehensive electronics ecosystem with Cartago’s precision manufacturing sector.
One-Stop Turnkey Scalability
Avoid vendor fragmentation. We combine advanced bare PCB fabrication (multilayers, heavy copper, high-frequency, and rigid-flex), full BOM kitting, SMT/DIP placement, custom thermal heat pipe integration, and sealed membrane switch panels under one certified quality umbrella. Your intellectual property and engineering standards remain uncompromised from the first prototype to high-volume production.
Rigorous Pre-Production DFM Support
Our senior CAM and process engineers evaluate every production package within 24 hours. We pinpoint copper balance anomalies, footprint discrepancies, component obsolescence, and insufficient trace spacing before fabrication starts. This rigorous proactive review protects our clients from costly board respins and assembly line downtime.
Flexible Batch Sizing with Zero Minimums
Hardware innovation demands agility. We support R&D engineering phases with prototype orders starting from just 5 pieces, while offering scalable infrastructure that smoothly handles pilot production and ramp-up to thousands of panels monthly, backed by Alibaba Trade Assurance for risk-free transactions.