Convert Degree Fahrenheit per watt to Millikelvin per watt
Convert Degree Fahrenheit per watt (°F/W) to Millikelvin per watt (mK/W) instantly and accurately.
Conversion Formula
mK/W = °F/W × 555.5555556
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 Millikelvin per watt
The millikelvin per watt (mK/W) equals exactly 10⁻³ K/W. It is used for ultra-low thermal resistances in high-conductivity materials such as diamond heat spreaders (≈ 0.3 mK/W per mm thickness for 1 cm² area), liquid metal TIMs, and cryogenic heat links. Measuring at this scale requires precision power dissipation and calorimetric temperature sensing. 1 mK/W = 10⁻³ K/W.
Quick Reference Table
| Degree Fahrenheit per watt (°F/W) | Millikelvin per watt (mK/W) |
|---|---|
| 1 °F/W | 555.556 mK/W |
| 2 °F/W | 1111.11 mK/W |
| 5 °F/W | 2777.78 mK/W |
| 10 °F/W | 5555.56 mK/W |
| 25 °F/W | 13888.9 mK/W |
| 50 °F/W | 27777.8 mK/W |
| 100 °F/W | 55555.6 mK/W |