P_max = 1.0 × 0.538 = 0.538 Watts
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Components have theoretical maximum ratings printed on their datasheets. However, running a resistor at 100% of its rated power at 80°C ambient is a recipe for disaster. This is where comes in. derating calculation
Most datasheets provide a . You can calculate the maximum allowed power using this linear formula:
Open your current design. Calculate the actual power/voltage stress at your max operating temperature. If any component is running above 80% of its datasheet max, upgrade it now. P_max = 1
Have you ever designed a circuit that worked perfectly on the bench, only to fail catastrophically in the field? The culprit is often not a bad solder joint or a software bug, but heat .
Derating Factor = (70) / (130) = 0.538
Don’t Let Your Components Fry: A Practical Guide to Derating Calculation