Heat Sink Calculator
Calculate required heatsink thermal resistance and size
Thermal Parameters
From component datasheet
TIM: 0.2-1.0°C/W typical
Heatsink Requirements
Large heatsink required
Required θsa
6.00
°C/W
Est. Surface Area
208.3
cm²
Total θja
8.50
°C/W
Case Temp (Tc)
105.0°C
Sink Temp (Ts)
100.0°C
Est. Size
122mm
square base
Conv. Coeff.
8.0
W/m²K
Common Heatsink θsa Values
| Type | θsa (°C/W) | Application |
|---|---|---|
| TO-220 clip | 8-15 | Low power, no fan |
| Small extruded (25×25mm) | 5-10 | 1-5W natural |
| Medium extruded (50×50mm) | 2-5 | 5-15W natural |
| Large extruded (100×100mm) | 1-2 | 15-50W natural |
| Forced air (50×50mm) | 0.5-2 | 20-50W with fan |
| Active cooler | 0.1-0.5 | 50-200W |
Use thermal interface material (TIM) to reduce θcs. Thermal paste: 0.2-0.5°C/W, thermal pads: 0.5-2°C/W. Mounting pressure significantly affects performance.