{"id":2140,"date":"2025-08-29T02:37:42","date_gmt":"2025-08-29T02:37:42","guid":{"rendered":"https:\/\/flj-pcb.com\/?page_id=2140"},"modified":"2025-09-25T08:01:12","modified_gmt":"2025-09-25T08:01:12","slug":"heavy-copper-pcb","status":"publish","type":"page","link":"https:\/\/flj-pcb.com\/fa\/pcb-manufacturer\/heavy-copper-pcb\/","title":{"rendered":"Heavy Copper PCBs for High-Current Use"},"content":{"rendered":"
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What does \u201cheavy-copper PCB\u201d mean?<\/h1>

Printed circuit boards come in many types. One of these types is the high-current PCB, also called a heavy-copper PCB. These boards have useful properties for applications that involve high current and changing temperatures. Heavy-copper PCBs can resist higher temperatures for longer times, they can handle higher current rates, and they provide stronger solder joints and connection points.<\/p>

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What is a high-current PCB?<\/h2>

A high-current PCB is a printed circuit board designed to support a higher critical current density than a standard PCB. A standard board may only support currents in the tens of amps. A high-current board can carry hundreds or even thousands of amps, and it can resist higher temperatures for long periods. The unique design of these PCBs uses thicker and heavier copper layers, and that gives the board stronger and more durable electrical and mechanical performance.<\/p>

Heavy-copper PCBs typically contain more than 3 ounces of copper per square foot<\/strong> for carrying high current loads. Even when the total copper amount is less than 3 oz\/ft\u00b2, a board can still be classed as a heavy-copper PCB if the copper thickness on critical areas is more than 4 oz\/ft\u00b2<\/strong>. This large amount of copper is used when adding width to a trace is not possible or not the best option.<\/p>

For example, on a DC motor PCB, the standard trace width needed to deliver the required power may be large, because designers must consider thermal constraints. Heavy-copper PCBs instead use thicker traces<\/strong> to achieve the same current carrying capacity while keeping trace width smaller. This helps save board space while maintaining thermal and electrical performance.<\/p>

You will commonly find that the copper thickness used in Heavy-copper boards ranges from about 105 \u00b5m to 400 \u00b5m<\/strong>. In addition to higher copper thickness, these boards are able to dissipate heat at high temperature while offering stronger electrical connections. This thermal management helps heavy-copper PCBs avoid thermal stress and failure under heavy load.<\/p>

Advantages of thick copper in PCB design<\/h1>

Thermal management is more important now than ever, because electronic equipment runs in harsher environments and at higher currents. Heavy-copper PCBs (for example, with internal and\/or external copper conductors in the range 5 oz\/ft\u00b2 to 19 oz\/ft\u00b2<\/strong>, and sometimes defined as over 4 oz\/ft\u00b2<\/strong>) help conduct heat away from components. This property can greatly reduce failures caused by overheating.<\/p>

\u062a\u0648\u0644\u06cc\u062f\u06a9\u0646\u0646\u062f\u06af\u0627\u0646 PCB<\/a> use heavy copper to create robust conductor platforms. The resulting boards offer better conductivity and greater resistance to thermal stress. These boards can also achieve the same current capacity in a smaller area because a single layer can carry more copper weight or because multiple copper weights are placed on the same layer.<\/p>

Key benefits of thick copper in PCBs include:<\/p>