This value is quite consistent with, and interrelated to, IC(max) and is 500 mW or half a watt for the entire group. PC (max) is the maximum power of the devices or the nominal load that can be connected through its collector-emitter.Therefore, it is recommended to use it at values less than half of IC (max). So you can see that it starts to heat up well even before reaching this limit, already at 60 mA. The BC547 should not be more than 100mA because this value will be the breakdown limit, above which the device will surely burn out.
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