Convert Degree Fahrenheit per watt to Degree Celsius per watt
Convert Degree Fahrenheit per watt (°F/W) to Degree Celsius per watt (°C/W) instantly and accurately.
Conversion Formula
°C/W = °F/W × 0.5555555556
About Degree Fahrenheit per watt
The degree Fahrenheit per watt (°F/W) equals exactly 5/9 K/W ≈ 0.5556 K/W. It appears in US power electronics datasheets and legacy JEDEC thermal specifications where junction-to-case resistance is reported in °F/W rather than °C/W or K/W. A device rated 5 °F/W has R = 5 × 5/9 ≈ 2.78 K/W. 1 °F/W = 5/9 K/W.
About Degree Celsius per watt
The degree Celsius per watt (°C/W) equals exactly 1 K/W since temperature intervals 1 °C = 1 K. It is the dominant notation in semiconductor, LED, and power electronics datasheets worldwide. Thermal resistance values such as RθJA (junction-to-ambient) and RθJC (junction-to-case) are almost universally quoted in °C/W. A package at 50 °C/W dissipating 2 W yields ΔT = 100 °C. 1 °C/W = 1 K/W.
Quick Reference Table
| Degree Fahrenheit per watt (°F/W) | Degree Celsius per watt (°C/W) |
|---|---|
| 1 °F/W | 0.555556 °C/W |
| 2 °F/W | 1.11111 °C/W |
| 5 °F/W | 2.77778 °C/W |
| 10 °F/W | 5.55556 °C/W |
| 25 °F/W | 13.8889 °C/W |
| 50 °F/W | 27.7778 °C/W |
| 100 °F/W | 55.5556 °C/W |