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circuit layout, minimum lead lengths and placing the suppressor device as close as possible to the equipment or components to be protected will minimize this overshoot. Some input impedance represented by Zin iS essential to prevent overstress ofthe protection device. This impedance should be as high as possible, without restricting the circuit operation. DUTY CYCLE DERATING The data of Figure l applies for non-repetitive conditions and at a lead temperature of25IC. Ifthe duty cycle increases, the peak power must be reduced as indicated by the curves of Figure 7. Average power must be derated as the lead or ambient temperature rises above 25IC. The average power derating curve normally given on data sheets may be normalized and used for this purpose. At first glance the derating curves ofFigure 7 appear to be in error as the 10 ms pulse has a higher derating factor than the 10 ys pulse. However, when the derating factor for a given pulse of Figure 7 is multiplied by the peak power value of Figure l for the same pulse, the results follow the expected trend.
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