Modem power transistors can usually stand a lot of rough treat- ment, within the maxima speci- fied for current, power dissi- pation, safe operating area, volt- age, temperature, et al. However, if any of these specified limits is exceeded the transistor in ques- tion usually commits suicide - as many designers have discovered ... If this transistor happens to be the series regulator in a stabilised power supply, the total repair bill can easily be an order of magni- tude higher than the cost of the transistor itself.
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