Default heatsink performances are based on a 150 mm long extrusion and 2m/s airflow.
Our Thermal Calculator indicates performance at different lengths and airspeeds. Specific performance figures are stated for board mount and BGA products.
Thermal Resistance is measured on a 60°C temperature sink to the ambient differential.
We have theoretically calculated performance at other lengths for you.
Natural Convection heat sinks are assumed to have a 0.85 emissivity value, meaning they are black anodised unless otherwise stated.
Performance figures given are for natural convection operating conditions and are for a 60°C temperature rise with a centrally mounted heat source and vertically mounted fins. Under general operating conditions the thermal mounting arrangement of devices is not known and therefore the figures should be used only as a guide to heatsink selection.
It is recommended that the effectiveness of any heatsink is confirmed in the specific operating environment in which it will be subjected.
