Discussion
What does a safe operating area diagram bound?
Answer: A
The diagram bounds which pairs of collector voltage and collector current the device may occupy, limited by maximum current, maximum voltage, maximum power and secondary breakdown. Gain, frequency and supply range are specified elsewhere. Four separate limits drawn on one pair of axes is far more useful than four numbers, because an operating point can then be checked against all of them at a glance - and a reactive load's trajectory can be plotted on it. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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