Enter your Thermal Power Dissipated, Thermal Pad dimensions, Via Drill Diameter, PCB Thickness, Copper Layer Thickness, and Target Temperature Rise to calculate the Required Via Count needed to keep your board cool, along with the resulting Thermal Resistance, recommended Via Spacing, and Via Area Ratio.
Required Via Count
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Thermal Resistance
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Via Spacing
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Via Area Ratio
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Thermal vias are small holes filled with conductive material that transfer heat from hot components through the PCB layers to heat sinks or larger copper areas, improving thermal management and preventing overheating.
Via diameter depends on your PCB manufacturing capabilities and thermal requirements. Larger vias conduct more heat but require more space. Common thermal via diameters range from 0.15mm to 0.4mm.
Via thermal resistance measures how effectively heat flows through the via structure. Lower thermal resistance means better heat transfer, which is crucial for maintaining component temperatures within safe operating limits.
Closer via spacing improves heat spreading but uses more PCB real estate. The optimal spacing balances thermal performance with routing constraints and manufacturing requirements.
Yes, the calculator considers PCB thickness which accounts for multiple layers. For complex multilayer designs, consider thermal performance of individual layer transitions and plane connectivity.
Standard copper thicknesses range from 0.5oz (17.5μm) to 4oz (140μm). Thicker copper improves thermal and electrical performance but increases PCB cost and manufacturing complexity.
More thermal vias improve heat dissipation but consume routing channels and board space. The calculator helps find the minimum via count needed to meet thermal requirements while preserving routing flexibility.