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[bc558] data sheet help

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ardwinoman

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hello ,please what diffrernce between collector current(DC) =-100 & peak collector current =-200 in limiting values table in data sheet attached .
is the first one dc and the second is ac or what ??
 

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Re: dataaa sheet help?????

DC current means continuous or RMS (Irms=Ipeak*SQRT(DutyCycle)), while Ipeak means instantaneous e.g. during pulsed operation (Duty Cycle != 100%).
 

The graphs of its DC current gain shows that it works very well to 10mA and poorly above 60mA. I would use it to 50mA. A BC327 has the same case but a max continuous current of 800mA. I would use a BC327 to 300mA. Beware that if it is linear with voltage across it and a high current then it will overheat.
 

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