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Heatsinks on PCB

Heatsinks integrated in the circuit.

Calculates the disperible power by an heatsink obtained directly on the PCB with variable dimensions and shape.
This kind of heatsink is adapt to treat low powers and is indispensable for components with only solder terminals.

Data input
Maximum expected ambience temperature.


Maximum working temperature of the heatsink.


Exposed surface


Wait calculate
Thermic resistance of the heatsink °C/W
Maximum dispersible power W
Index of utilization of surfaces %

Real example of a heat sink on PCB Notes.
Calculation refers to glass-fiber supports with copper plating of standard thickness, for bakelite supports the result is downgraded.

The heatsink must be electric insulated to allow the direct contact of the heating element with the heatsink itself, in some case is the component solder that transfers the heat (example diodes or power resistance).

The heatsink shape has got a great influence caused by the real low thickness of copper avaible, for a better efficiency the heating element must be placed at the center of the avaible surface.

Pay attention on setting the ambience temperature, for ambience temperature means the working temperature of the PCB that is subjected at the induced heating of the components themselves.

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Applications for thermal dissipation.

Heatsink in free air
Heatsinks on PCB
Heatsink with forced circulation
Dissipation for cabinets
Forced ventilation
for cabinets