PCB Trace Width Calculator

Ensuring your PCB traces can handle the required current without overheating is a critical step in professional board design. This calculator utilizes the IPC-2221 standard to determine the minimum trace width necessary to maintain circuit safety and reliability. By inputting your target current and allowable temperature rise, you can prevent board delamination or catastrophic trace failure caused by excessive resistive heating.

This utility provides essential design data for engineers developing power distribution networks or high-current signal paths:

• Standardized Calculations: Uses the IPC-2221 formulas to calculate the minimum cross-sectional area and width required for a specific current.
• Layer-Specific Logic: Accounts for the different heat dissipation properties of Internal Layers (buried in FR4) versus External Layers (exposed to air).
• Copper Weight Selection: Allows for various standard copper thicknesses, from 0.5 oz up to 3.0 oz, to accommodate high-power applications like motor drivers or power supplies.
• Thermal Management: Helps you design for a specific Temperature Rise (typically 10°C to 20°C) above ambient to ensure the longevity of the PCB substrate and surrounding components.
• Electrical Characteristics: Provides an estimated Resistance per Meter, allowing you to calculate potential voltage drops across long power traces.

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Simplify hardware and firmware development using the Quickboards Library. Eliminate R&D uncertainty and cut design time by assembling subcircuit schematics from a library of Processors, Sensors, Power Management, ADC/DACs, Memory, Interface circuits and more. Download the full library here.