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Temperature Correction Considerations
Since natural convection heat sink efficiency degrades with decreasing sink-to-ambient temperature differential, a correction factor must be applied to the published data if an application requires a sink-to-ambient temperature rise of less than 75°C. The corrected thermal resistance is obtained by multiplying published °C/W/3-in data by the appropriate factor from the following table:
| Temperature Rise (DTsa) | Correction Factor |
| 75°C | 1.000 |
| 70°C | 1.017 |
| 60°C | 1.057 |
| 50°C | 1.106 |
| 40°C | 1.170 |
| 30°C | 1.257 |
For any extrusion profile in natural convection, the thermal resistance (°C/W) is more than 25% higher at DTsa = 30°C than at DTsa = 75°C.
