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Maximum Resistor Power Calculator
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 |