Convert Degree Fahrenheit per watt to Degree Celsius per milliwatt
Convert Degree Fahrenheit per watt (°F/W) to Degree Celsius per milliwatt (°C/mW) instantly and accurately.
Conversion Formula
°C/mW = °F/W × 0.0005555555556
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 milliwatt
The degree Celsius per milliwatt (°C/mW) equals exactly 1000 K/W since 1 mW = 10⁻³ W and 1 °C = 1 K. Widely used in low-power semiconductor datasheets for characterising junction-to-ambient resistance: small-signal transistors, LEDs, photodiodes, and SMD resistors typically show RθJA of 50-500 °C/mW. A device at 200 °C/mW dissipating 5 mW rises 1 °C. 1 °C/mW = 1000 K/W = 1 kK/W.
Quick Reference Table
| Degree Fahrenheit per watt (°F/W) | Degree Celsius per milliwatt (°C/mW) |
|---|---|
| 1 °F/W | 0.000555556 °C/mW |
| 2 °F/W | 0.00111111 °C/mW |
| 5 °F/W | 0.00277778 °C/mW |
| 10 °F/W | 0.00555556 °C/mW |
| 25 °F/W | 0.0138889 °C/mW |
| 50 °F/W | 0.0277778 °C/mW |
| 100 °F/W | 0.0555556 °C/mW |