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The below calculator is designed to calculate the maximum power that a resistor can dissipate based on a given heat sink size 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 a selection of our power resistors and their specifications, all of which are heat sink mountable:
| Series | Thermal Resistace | Resistance Range | Tolerance | TCR | Power Rating | Packaging |
|---|---|---|---|---|---|---|
| Caddock MP915 | 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 | 7.81°C/W | 0.01Ω to 0.019Ω | ±5.0% | 0 to +500 ppm/°C | 16W | TO-126 style |
| Caddock MP925 | 5.00°C/W | 5kΩ to 100kΩ | ±1.0% | -20 to +80 ppm/°C | 25W | TO-220 style |
| Caddock MP930 | 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 | 1.50°C/W | 0.05Ω to 100Ω | ±1.0% | -20 to +80 ppm/°C (from 0.5Ω) | 100W | TO-247 style |
| Isabellenhütte PBH | 4°C/W | 0.002Ω to 100Ω | ±0.5% (from 0.01Ω) | <50 ppm/°C | 10W | TO-247 style |
| Isabellenhütte PBV | 3°C/W | 0.0005Ω to 1Ω | ±0.5% (from 0.0015Ω) | <30 ppm/°C (from 0.01Ω) | 10W | Non-standard |
| Isabellenhütte A-H2 | 3°C/W | 0.001Ω to 100Ω | ±0.1% (from 0.001Ω) | <30 ppm/°C | 10W | Non-standard |
Users are hereby informed that Rhopoint accepts no responsibility for any inaccuracies or issues that may arise from the use of our online calculators. All data and results should be independently verified prior to their application in any projects or calculations.
