Resistor Power ratings are normally specified at +25oC and must be reduced as the resistor temperature increases. A derating chart is often used, with derating starting at 70oC. Since parameters are application dependent, power de-rating curves or charts should be considered general rather than absolute, and only used as a guideline. The safest designs use the largest physical size operating at conservative temperatures and power ratings. Resistor Networks
|
|
Wire Wound Temperature |
Metal Film Temperature |
| 100% | 70oC | 70oC |
| 80% | 110oC | 85oC |
| 60% | 150oC | 100oC |
| 40% | 190oC | 120oC |
| 20% | 240oC | 140oC |
| 10% | 260oC | 145oC |
Resistor Manufacturers, or Potentiometer Manufacturers
How to Derate; Guideline for Derating Electronic Components
Key Words: Resistor, Component Derating, Reliability, Sizing, Derate, Burned, Ampacity, Fusing, Insulation, Rated Temp, Temperature, Guide, Burning, Guideline, Example, Design.









