Resistor Derating Guide Lines

Resistor Power ratings are normally specified at +25^oC and must be reduced as the resistor temperature increases. A derating chart is often used, with derating starting at 70^oC. 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

**Resistor Derating Chart**
% Rated load	Wire Wound Temperature	Metal Film Temperature
100%	70^oC	70^oC
80%	110^oC	85^oC
60%	150^oC	100^oC
40%	190^oC	120^oC
20%	240^oC	140^oC
10%	260^oC	145^oC

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.


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