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Heat Sink Size Calculator
The below calculator is designed to calculate the heat sink size required for a given power and ambient conditions. This calculator assumes 1°C/W for the thermal resistance of the resistor body to the heat sink case.
Enter values below and the result will automatically be calculated.
Popular manufacturers
The table below offers some heat sink mountable resistor options we have available as well as some of their specifications:
| SERIES | THERMAL RESISTANCE | RESISTANCE RANGE | TOLERANCE | TCR | POWER RATING | PACKAGE |
|---|---|---|---|---|---|---|
| Caddock MP915 Series | 8.33°C/W | 0.02Ω to 1kΩ | ±1.0% (from 0.05Ω) | -20 to +80 ppm/°C (from 0.5Ω) | 15W | TO-126 style |
| Caddock MP916 Series | 7.81°C/W | 0.01Ω to 0.019Ω | ±5.0% | 0 to +500 ppm/°C | 16W | TO-126 style |
| Caddock MP925 Series | 5.00°C/W | 5kΩ to 100kΩ | ±1.0% | -20 to +80 ppm/°C | 25W | TO-220 style |
| Caddock MP930 Series | 4.17°C/W | 0.02Ω to 4.99kΩ | ±1.0% (from 0.05Ω) | -20 to +80 ppm/°C (from 0.5Ω) | 30W | TO-220 style |
| Caddock MP9100 Series | 1.50°C/W | 0.05Ω to 100Ω | ±1.0% | -20 to +80 ppm/°C (from 0.5Ω) | 100W | TO-247 style |
| Isabellenhütte PBH Series | 4°C/W | 0.002Ω to 100Ω | ±0.5% (from 0.01Ω) | <50 ppm/°C | 10W | TO-247 style |
| Isabellenhütte PBV Series | 3°C/W | 0.0005Ω to 1Ω | ±0.5% (from 0.0015Ω) | <30 ppm/°C (from 0.01Ω) | 10W | Non-standard |
| Isabellenhütte A-H2 Series | 3°C/W | 0.001Ω to 100Ω | ±0.1% (from 0.001Ω) | <30 ppm/°C | 10W | Non-standard |
