Heavy Copper PCB - PCB Assembly Manufacturer | SMT, THT & Turnkey PCBA Services

Heavy Copper PCB Manufacturing | High-Current & Thermal Management Solutions

For power electronics, high-current distribution, and thermal-intensive applications, standard 1oz or 2oz copper PCBs are often insufficient. Heavy Copper PCBs (also known as thick copper PCBs), typically defined as having finished copper weights of 4oz (140µm) or more, provide the robust solution required for demanding environments.

Why Choose Heavy Copper for Your Power Design?

Upgrading to a heavy copper PCB is an engineering decision driven by specific performance needs. The increased copper cross-section directly translates to several key advantages:

Higher Current Carrying Capacity: The primary benefit. A thicker copper trace can safely conduct significantly more current without overheating, making it essential for power supplies, inverters, and industrial controls.
Superior Thermal Management: Heavy copper acts as an integrated heat spreader, efficiently dissipating heat away from critical components. This reduces the need for separate, bulky heatsinks and improves long-term reliability.
Increased Mechanical Strength: Connector points and high-stress areas benefit from the added copper, providing greater resistance to cracking or damage during assembly and field use.
Compact, Multi-Weight Designs: Advanced manufacturing allows for multiple copper weights on a single layer. This enables designers to place high-current traces alongside low-power signal traces in a smaller overall footprint, reducing product size.

Heavy Copper PCB Manufacturing Capabilities

Fabricating heavy copper boards requires specialized etching and lamination processes. Standard PCB manufacturers often cannot achieve the required trace/space tolerances for thicker copper. Our proven capabilities for heavy copper are detailed below:

Feature	Capability
Quality Grade	IPC Class 2 (Class 3 available for high-reliability applications)
Number of Layers	2 – 24 layers
Order Quantity	1 prototype piece to 10,000+ production units
Lead Time	2 days (quick-turn) to 5 weeks (complex builds)
Material	FR-4 Standard (Tg 140°C) & FR-4 High Tg (170°C)
Board Size	Min 6mm x 6mm	Max 457mm x 610mm
Board Thickness	0.6mm – 6.5mm
Max Outer Layer Copper	15oz (525µm) finished
Max Inner Layer Copper	12oz (420µm)
Surface Finishes	HASL, Lead-Free HASL, ENIG (all RoHS)

Critical Trace Width & Spacing for Heavy Copper:

To ensure manufacturability, trace geometry must scale with copper weight. Below are our standard design rules:

Copper Weight	External Layers (Trace/Space)	Internal Layers (Trace/Space)
4 oz	9 mil / 9 mil	8 mil / 12 mil
5 oz	11 mil / 11 mil	10 mil / 14 mil
6 oz	13 mil / 13 mil	12 mil / 16 mil
12 oz	20 mil / 32 mil	20 mil / 32 mil
15 oz	32 mil / 40 mil	(Contact engineering)

Engineering Support for Your Heavy Copper Project

Successfully transitioning a design to heavy copper requires expertise. We provide direct engineering support to help you avoid costly redesigns:

Design for Manufacture (DFM) Review: Our engineers will run a comprehensive DFM check on your files, focusing specifically on heavy-copper design rules (trace/space, annular rings, drill ratios).
Material Selection Guidance: Not sure if standard FR-4 or High Tg material is right for your thermal requirements? We offer clear, data-backed advice.
Advanced Technique Support: For complex requirements, we can implement blind/buried vias and gold fingers on your heavy copper boards.

Get Your Heavy Copper PCB Quote

To receive a detailed, itemized quotation for your heavy copper PCB project, please submit your Gerber files and specifications using our online order system. For designs with unique requirements (e.g., copper weights >15oz, specialized materials), contact our engineering team directly for a rapid consultation.

Working on automotive, industrial, IoT, or consumer electronics projects? We provide professional PCB assembly services including SMT, DIP, and full turnkey solutions.

Send us your BOM, Gerber files, or project requirements and get a fast, accurate quotation from our engineering team.

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