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Accessories for RPL probes
Accessories for RPL probes
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35W D-PAK surface mount power resistor TMP20S series
35W D-PAK surface mount power resistor TMP20S series
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120A high power shunt SPR038
120A high power shunt SPR038
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Microminiature ATE grade reed relay 2200 series
Microminiature ATE grade reed relay 2200 series
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Low resistance CSR series
Low resistance CSR series
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Applcation Notes

Maximum resistor power for given heatsink

This calculator enables the user to calculate the maximum power that a resistor can dissipate with a given heatsink size and ambient temperature.

This calculator assumes 1°C/W for the themal resistance resistor body to heatsink case.

Themal resistance of external heatsink
°C/W
Maximum resistance temp.
°C
Maximum ambient temp.
°C
Thermal resistance element to case *
°C/W
Power dissipated in resistor
Watts

* Typical values of the thermal resistance element to case for heatsink mount transistor package resistors are: MP915 - 8.3°C/W, MP925 - 5°C/W, MP930 - 4.2°C/W, MP930 - 4.2°C/W, MP9100 - 1.5°C/W, PBH - 4°C/W, PBV - 3°C/W, AH2 - 3°C/W.