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The switching component must be suitably cooled so that the junction temperature does not exceed the values specified : usually 125 or 150°C (this value depends on the power components) and so that the temperature of the heatsink does not exceed 90 or 100°C.

The heatsink can be determined either by calculation (see technical note – pages 4 to 6) or directly from the curves provided by celduc.

**How to use thermal curves from our technical data-sheets ?**

The type of heatsink to be used can be determined directly according to the switched currrent and the ambient temperature.

Example Ieff = 6 A and ambiant temperature max = 38°C

Operating mode of the above curves :

- identify the current to be switched on the abscissa of the left hand curve
- plot a vertical line from this point up to the curve
**(1)** - from the point obtained, a horizontal line is plotted to the right hand curve
**(2)** - identify the ambient temperature on the abscissa of the right hand curve
- plot a vertical line from this point until you meet the horizontal line previously plotted
**(3)** - this point determines the type of heatsink to the used
- choose the heatsink corresponding to the curve located above this point. In this example 1,2°/W
**(4)**

You can see that with a heatsink of 1,2°/W and 6A, the ambient temperature should not exceed 54°C **(8) (9)**

And with a heatsink of 1,2°/W and an ambient temperature of 38°C the maximum current could reach 8A **(5) (6) (7)**

To have access to our complete range of heatsinks – click here

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